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Ahmed NM, Altamura P, Giampaoletti M, Hemeida FA, Mohamed AFA. Optimizing human thermal comfort and mitigating the urban heat island effect on public open spaces in Rome, Italy through sustainable design strategies. Sci Rep 2024; 14:19931. [PMID: 39198510 DOI: 10.1038/s41598-024-65794-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2024] [Accepted: 06/24/2024] [Indexed: 09/01/2024] Open
Abstract
The climate affects how a city's outdoor spaces are utilized. It is more likely that people will use and appreciate public areas designed for pedestrian use, such as parks, squares, streets, and foot-cycle pathways, when they provide a comfortable and healthy environment. A predicted increase in global temperature has made the climate uncomfortable, especially during the summer when heat stress is strengthened and anticipated. This phenomenon is more severe in urban areas, often affected by the Urban Heat Island (UHI) effect. Since the spatial characteristics of a city influence its climate, urban design can be deployed to mitigate the combined effects of climate change and UHI. This research is conducted to study the UHI effect on thermal comfort in an urban open space in Rome (Italy) and aims at identifying and implementing a methodology that urban designers can follow to reduce the impact of urban heat islands and increase thermal comfort in urban outdoor space. This study is based on an urban design concept adopting the Sustainable Development Goals as guidelines; it investigates how UHI's effect affects the use of public space and examines the influence of urban microclimatic conditions on the thermal perception of users through PET, PMV and PPD values, that were assessed through simulations with ENVI-MET software. The study thus proposes a redesign for the site in Rome, with a masterplan based on sustainable design principles, aimed at improving the microclimatic conditions in the site. The design solution was then validated through ex post simulations.
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Affiliation(s)
- Nour M Ahmed
- Architectural Engineering & Environmental Design Department, Faculty of Engineering & Technology, The Arab Academy for Science, Technology, and Maritime Transport, Aswan, Egypt.
| | - Paola Altamura
- Planning Design Technology of Architecture Department, "Sapienza" University of Rome, Rome, Italy
| | - Marco Giampaoletti
- Planning Design Technology of Architecture Department, "Sapienza" University of Rome, Rome, Italy
| | - Fahd A Hemeida
- Architectural Engineering & Environmental Design Department, Faculty of Engineering & Technology, The Arab Academy for Science, Technology, and Maritime Transport, Alexanderia, Egypt
| | - Abdelaziz Farouk A Mohamed
- Architectural Engineering & Environmental Design Department, Faculty of Engineering & Technology, The Arab Academy for Science, Technology, and Maritime Transport, Heliopolis, Cairo, Egypt.
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Ortiz L, Braneon C, Horton R, Bader D, Orton P, Gornitz V, Rosenzweig B, McPhearson T, Smalls-Mantey L, Sheerazi H, Montalto FA, Golkhandan MR, Evans C, DeGaetano A, Mallen E, Carter L, McConnell K, Mayo T, Buchanan M. NPCC4: Tail risk, climate drivers of extreme heat, and new methods for extreme event projections. Ann N Y Acad Sci 2024. [PMID: 39159316 DOI: 10.1111/nyas.15180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/21/2024]
Abstract
We summarize historic New York City (NYC) climate change trends and provide the latest scientific analyses on projected future changes based on a range of global greenhouse gas emissions scenarios. Building on previous NPCC assessment reports, we describe new methods used to develop the projections of record for sea level rise, temperature, and precipitation for NYC, across multiple emissions pathways and analyze the issue of the "hot models" associated with the 6th phase of the Coupled Model Intercomparison Project (CMIP6) and their potential impact on NYC's climate projections. We describe the state of the science on temperature variability within NYC and explain both the large-scale and regional dynamics that lead to extreme heat events, as well as the local physical drivers that lead to inequitable distributions of exposure to extreme heat. We identify three areas of tail risk and potential for its mischaracterization, including the physical processes of extreme events and the effects of a changing climate. Finally, we review opportunities for future research, with a focus on the hot model problem and the intersection of spatial resolution of projections with gaps in knowledge in the impacts of the climate signal on intraurban heat and heat exposure.
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Affiliation(s)
- Luis Ortiz
- Department of Atmospheric, Oceanic, and Earth Sciences, George Mason University, Fairfax, Virginia, USA
| | - Christian Braneon
- CUNY Institute for Demographic Research (CIDR), City University of New York, New York City, New York, USA
- NASA Goddard Institute for Space Studies, New York City, New York, USA
- Columbia Climate School, Columbia University, New York City, New York, USA
| | - Radley Horton
- Columbia Climate School, Columbia University, New York City, New York, USA
- Lamont-Doherty Earth Observatory, Columbia University, Palisades, New York, USA
| | - Daniel Bader
- NASA Goddard Institute for Space Studies, New York City, New York, USA
- Center for Climate Systems Research, Columbia University, New York City, New York, USA
| | - Philip Orton
- Stevens Institute of Technology, Hoboken, New Jersey, USA
| | - Vivien Gornitz
- NASA Goddard Institute for Space Studies, New York City, New York, USA
| | - Bernice Rosenzweig
- Department of Environmental Science, Sarah Lawrence College, Bronxville, New York, USA
| | - Timon McPhearson
- Urban Systems Lab, The New School, New York City, New York, USA
- Cary Institute of Ecosystem Studies, Millbrook, New York, USA
- Stockholm Resilience Centre, Stockholm University, Stockholm, Sweden
| | - Lauren Smalls-Mantey
- New York City Department of Health and Mental Hygiene, New York City, New York, USA
| | | | - Franco A Montalto
- Department of Civil, Architectural and Environmental Engineering, Drexel University, Philadelphia, Pennsylvania, USA
| | - Mobin Rahimi Golkhandan
- Department of Civil, Architectural and Environmental Engineering, Drexel University, Philadelphia, Pennsylvania, USA
| | - Colin Evans
- Earth and Atmospheric Sciences, Cornell University, Ithaca, New York, USA
| | - Arthur DeGaetano
- Earth and Atmospheric Sciences, Cornell University, Ithaca, New York, USA
| | - Evan Mallen
- Urban Climate Lab, School of City and Regional Planning, Georgia Institute of Technology, Atlanta, Georgia, USA
| | - Latonya Carter
- Department of Geography and Geoinformation Science, George Mason University, Fairfax, Virginia, USA
| | - Kathryn McConnell
- Department of Sociology, The University of British Columbia, Vancouver, British Columbia, CA
| | - Talea Mayo
- Department of Mathematics, Emory University, Atlanta, Georgia, USA
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Moreira X, Van den Bossche A, Moeys K, Van Meerbeek K, Thomaes A, Vázquez-González C, Abdala-Roberts L, Brunet J, Cousins SAO, Defossez E, De Pauw K, Diekmann M, Glauser G, Graae BJ, Hagenblad J, Heavyside P, Hedwall PO, Heinken T, Huang S, Lago-Núñez B, Lenoir J, Lindgren J, Lindmo S, Mazalla L, Naaf T, Orczewska A, Paulssen J, Plue J, Rasmann S, Spicher F, Vanneste T, Verschuren L, Visakorpi K, Wulf M, De Frenne P. Variation in insect herbivory across an urbanization gradient: The role of abiotic factors and leaf secondary metabolites. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2024; 215:109056. [PMID: 39186848 DOI: 10.1016/j.plaphy.2024.109056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2024] [Revised: 07/31/2024] [Accepted: 08/17/2024] [Indexed: 08/28/2024]
Abstract
Urbanization impacts plant-herbivore interactions, which are crucial for ecosystem functions such as carbon sequestration and nutrient cycling. While some studies have reported reductions in insect herbivory in urban areas (relative to rural or natural forests), this trend is not consistent and the underlying causes for such variation remain unclear. We conducted a continental-scale study on insect herbivory along urbanization gradients for three European tree species: Quercus robur, Tilia cordata, and Fraxinus excelsior, and further investigated their biotic and abiotic correlates to get at mechanisms. To this end, we quantified insect leaf herbivory and foliar secondary metabolites (phenolics, terpenoids, alkaloids) for 176 trees across eight European cities. Additionally, we collected data on microclimate (air temperature) and soil characteristics (pH, carbon, nutrients) to test for abiotic correlates of urbanization effects directly or indirectly (through changes in plant secondary chemistry) linked to herbivory. Our results showed that urbanization was negatively associated with herbivory for Q. robur and F. excelsior, but not for T. cordata. In addition, urbanization was positively associated with secondary metabolite concentrations, but only for Q. robur. Urbanization was positively associated with air temperature for Q. robur and F. excelsior, and negatively with soil nutrients (magnesium) in the case of F. excelsior, but these abiotic variables were not associated with herbivory. Contrary to expectations, we found no evidence for indirect effects of abiotic factors via plant defences on herbivory for either Q. robur or F. excelsior. Additional biotic or abiotic drivers must therefore be accounted for to explain observed urbanization gradients in herbivory and their interspecific variation.
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Affiliation(s)
- Xoaquín Moreira
- Misión Biológica de Galicia (MBG-CSIC), Apartado de Correos 28, 36080, Pontevedra, Galicia, Spain.
| | - Astrid Van den Bossche
- Forest & Nature Lab, Department of Environment, Faculty of Bioscience Engineering, Ghent University, Geraardsbergsesteenweg 267, 9090, Melle-Gontrode, Belgium
| | - Karlien Moeys
- Department of Earth and Environmental Sciences, KU Leuven, Celestijnenlaan 200E, 3001, Leuven, Belgium
| | - Koenraad Van Meerbeek
- Department of Earth and Environmental Sciences, KU Leuven, Celestijnenlaan 200E, 3001, Leuven, Belgium
| | - Arno Thomaes
- Research Institute for Nature and Forest (INBO), Gaverstraat 4, 9500, Geraardsbergen, Belgium
| | - Carla Vázquez-González
- Misión Biológica de Galicia (MBG-CSIC), Apartado de Correos 28, 36080, Pontevedra, Galicia, Spain
| | - Luis Abdala-Roberts
- Departamento de Ecología Tropical, Campus de Ciencias Biológicas y Agropecuarias, Universidad Autónoma de Yucatán, Apartado Postal 4-116, Itzimná, 97000, Mérida, Yucatán, Mexico
| | - Jörg Brunet
- Southern Swedish Forest Research Centre, Swedish University of Agricultural Sciences, Box 190, 234 22, Lomma, Sweden
| | - Sara A O Cousins
- Department of Physical Geography, Stockholm University, 10691, Stockholm, Sweden
| | - Emmanuel Defossez
- Institute of Biology, Laboratory of Functional Ecology, University of Neuchâtel, Neuchâtel, Switzerland
| | - Karen De Pauw
- Forest & Nature Lab, Department of Environment, Faculty of Bioscience Engineering, Ghent University, Geraardsbergsesteenweg 267, 9090, Melle-Gontrode, Belgium
| | - Martin Diekmann
- Institute of Ecology, FB 2, University of Bremen, James-Watt-Straße 1, 28359, Bremen, Germany
| | - Gaétan Glauser
- Neuchâtel Platform of Analytical Chemistry, University of Neuchâtel, Neuchâtel, Switzerland
| | - Bente J Graae
- Department of Biology, Norwegian University of Science and Technology, 7491, Trondheim, Norway
| | - Jenny Hagenblad
- Department of Physics, Chemistry and Biology, Linköping University, SE-581 83, Linköping, Sweden
| | - Paige Heavyside
- Department of Biology, Norwegian University of Science and Technology, 7491, Trondheim, Norway
| | - Per-Ola Hedwall
- Southern Swedish Forest Research Centre, Swedish University of Agricultural Sciences, Box 190, 234 22, Lomma, Sweden
| | - Thilo Heinken
- Institute of Biochemistry and Biology, University of Potsdam, Maulbeerallee 3, 14469, Potsdam, Germany
| | - Siyu Huang
- Leibniz Centre for Agricultural Landscape Research (ZALF), 15374, Muencheberg, Germany
| | - Beatriz Lago-Núñez
- Misión Biológica de Galicia (MBG-CSIC), Apartado de Correos 28, 36080, Pontevedra, Galicia, Spain
| | - Jonathan Lenoir
- UMR, CNRS 7058 'Ecologie et Dynamique des Systèmes Anthropisés' (EDYSAN), Université de Picardie Jules Verne, 1 Rue des Louvels, F-80037, Amiens, France
| | - Jessica Lindgren
- Department of Physical Geography, Stockholm University, 10691, Stockholm, Sweden
| | - Sigrid Lindmo
- Department of Biology, Norwegian University of Science and Technology, 7491, Trondheim, Norway
| | - Leonie Mazalla
- Institute of Ecology, FB 2, University of Bremen, James-Watt-Straße 1, 28359, Bremen, Germany
| | - Tobias Naaf
- Leibniz Centre for Agricultural Landscape Research (ZALF), 15374, Muencheberg, Germany
| | - Anna Orczewska
- Institute of Biology, Biotechnology and Environmental Protection, Faculty of Natural Sciences, University of Silesia, Bankowa 9, 40-007, Katowice, Poland
| | - Jolina Paulssen
- Institute of Ecology, FB 2, University of Bremen, James-Watt-Straße 1, 28359, Bremen, Germany
| | - Jan Plue
- Department of Urban and Rural Development, SLU Swedish Biodiversity Centre (CBM). Swedish University for Agricultural Sciences, 750 07 Uppsala, Sweden
| | - Sergio Rasmann
- Institute of Biology, Laboratory of Functional Ecology, University of Neuchâtel, Neuchâtel, Switzerland
| | - Fabien Spicher
- UMR, CNRS 7058 'Ecologie et Dynamique des Systèmes Anthropisés' (EDYSAN), Université de Picardie Jules Verne, 1 Rue des Louvels, F-80037, Amiens, France
| | - Thomas Vanneste
- Forest & Nature Lab, Department of Environment, Faculty of Bioscience Engineering, Ghent University, Geraardsbergsesteenweg 267, 9090, Melle-Gontrode, Belgium
| | - Louis Verschuren
- Forest & Nature Lab, Department of Environment, Faculty of Bioscience Engineering, Ghent University, Geraardsbergsesteenweg 267, 9090, Melle-Gontrode, Belgium; UGent-Woodlab, Department of Environment, Faculty of Bioscience Engineering, Ghent University, Coupure links 653, 9000, Ghent, Belgium; Centre for X-ray Tomography, Ghent University, 9000, Ghent, Belgium
| | - Kristiina Visakorpi
- Department of Biology, Norwegian University of Science and Technology, 7491, Trondheim, Norway
| | - Monika Wulf
- Leibniz Centre for Agricultural Landscape Research (ZALF), 15374, Muencheberg, Germany
| | - Pieter De Frenne
- Forest & Nature Lab, Department of Environment, Faculty of Bioscience Engineering, Ghent University, Geraardsbergsesteenweg 267, 9090, Melle-Gontrode, Belgium
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Song J, Gasparrini A, Wei D, Lu Y, Hu K, Fischer TB, Nieuwenhuijsen M. Do greenspaces really reduce heat health impacts? Evidence for different vegetation types and distance-based greenspace exposure. ENVIRONMENT INTERNATIONAL 2024; 191:108950. [PMID: 39190977 DOI: 10.1016/j.envint.2024.108950] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2024] [Revised: 07/17/2024] [Accepted: 08/12/2024] [Indexed: 08/29/2024]
Abstract
BACKGROUND While vegetation type, population density and proximity to greenspaces have been linked to human health, what type and location of greenspace matter most have remained unclear. In this context, there are question marks over investment-style metrics. OBJECTIVES This paper aims at establishing what vegetation type may matter most in modifying heat-mortality associations, and what the optimal buffer distances of total and specific types of greenspace exposure associated with reduced heat-related mortality risks are. METHODS We conducted small-area analyses using daily mortality data for 286 Territory Planning Units (TPUs) across Hong Kong and 1 × 1 km gridded air temperature data for the summer months (2005-2018). Using a case time series design, we examined effect modifications of total and specific types of greenspaces, as well as population-weighted exposure at varying buffer distances (200-4000 m). We tested the significance of effect modifications by comparing relative risks (RRs) between the lowest and highest quartiles of each greenspace exposure metric; and explored the strength of effect modifications by calculating the ratio of RRs. RESULTS Forests, unlike grasslands, showed significant effect modifications on heat-mortality associations, with RRs rising from 0.98 (95 %CI: 0.92,1.05) to 1.06 (1.03, 1.10) for the highest to lowest quartiles (p-value = 0.037) The optimal distances associated with the most apparent effects were around 1 km for population-weighted exposure, with the ratio of RRs being 1.424 (1.038,1.954) for NDVI, 1.191 (1.004,1.413) for total greenspace, and 1.227 (1.024,1.470) for forests. A marked difference was observed in terms of the paired area-level and optimal distance-based exposure to total greenspace and forests under extreme heat (p-values < 0.05). DISCUSSION Our findings suggest that greenspace, particularly nearby forests, may significantly mitigate heat-related mortality risks.
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Affiliation(s)
- Jinglu Song
- Department of Urban Planning and Design, Xi'an Jiaotong-Liverpool University, Suzhou 215123, China.
| | - Antonio Gasparrini
- Department of Public Health, Environment and Society, London School of Hygiene and Tropical Medicine, 15-17 Tavistock Place, London WC1H 9SH, UK.
| | - Di Wei
- Department of Architecture and Civil Engineering, City University of Hong Kong, Hong Kong, China; School of Architecture and Urban Planning, Huazhong University of Science and Technology, Wuhan, China; Hubei Engineering and Technology Research Center of Urbanization, Wuhan, China.
| | - Yi Lu
- Department of Architecture and Civil Engineering, City University of Hong Kong, Hong Kong, China.
| | - Kejia Hu
- Institute of Big Data in Health Science, School of Public Health, Zhejiang University, Zijingang Campus, Hangzhou 310058, China.
| | - Thomas B Fischer
- Environmental Assessment and Management Research Centre, School of Environmental Sciences, University of Liverpool, Liverpool, UK; Research Unit for Environmental Sciences and Management, Faculty of Natural and Agricultural Sciences, North West University, Potchefstroom, South Africa.
| | - Mark Nieuwenhuijsen
- Barcelona Institute for Global Health (ISGlobal), Doctor Aiguader 88, Barcelona 08003, Spain; Universitat Pompeu Fabra (UPF), Doctor Aiguader 88, Barcelona 08003, Spain; CIBER Epidemioloǵıa y Salud Pública (CIBERESP), Melchor Fernández Almagro, 3-5, Madrid 28029, Spain.
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Gao Y, Tian G, Shi X, Lin T. Impacts of urbanization on ecosystem carbon cycle: a case study of land use change in Tianjin metropolitan area. ENVIRONMENTAL MONITORING AND ASSESSMENT 2024; 196:762. [PMID: 39052055 DOI: 10.1007/s10661-024-12912-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2024] [Accepted: 07/11/2024] [Indexed: 07/27/2024]
Abstract
For the sustainable development of the city, in a study of Tianjin's rapid urbanization, we explore the complex interplay between land use change and the ecosystem carbon cycle from 2000 to 2020. Spatial analysis and profit-loss matrix calculations reveal contrasting ecological impacts: expansion of woodlands and grasslands enhances Net Primary Productivity (NPP) and reduces carbon emissions, while urban construction shows the opposite effect. Over 20 years, Tianjin's urban transformation led to a 16.91 GgC decline in NPP amidst a construction boom. However, post-2015 ecological policy shifts resulted in a significant net carbon uptake of 0.85 Gt, demonstrating the potential of policy interventions in mitigating environmental impacts of urbanization. This study underscores the importance of sustainable urban planning and ecological conservation strategies in highly urbanized settings.
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Affiliation(s)
- Yanning Gao
- School of Government, Beijing Normal University, Beijing, 100875, China
- State Key Laboratory of Remote Sensing Science, Beijing Normal University, Beijing, 100875, China
| | - Guangjin Tian
- School of Government, Beijing Normal University, Beijing, 100875, China.
- State Key Laboratory of Remote Sensing Science, Beijing Normal University, Beijing, 100875, China.
| | - Xiaowen Shi
- School of Government, Beijing Normal University, Beijing, 100875, China
| | - Tong Lin
- School of Government, Beijing Normal University, Beijing, 100875, China
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Hu L, Uejio C. Ground Urban Heat Island: Strengthening the Connection Between Spaceborne Thermal Observations and Urban Heat Risk Management. GEOHEALTH 2024; 8:e2024GH001114. [PMID: 39050807 PMCID: PMC11266779 DOI: 10.1029/2024gh001114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/17/2024] [Revised: 07/11/2024] [Accepted: 07/17/2024] [Indexed: 07/27/2024]
Abstract
As urbanization progresses under a changing climate, urban populations face increasing threats from chronically higher heat exposures and more frequent extreme heat events. Understanding the complex urban thermal exposure patterns becomes crucial for effective heat risk management. The spatial advantage of satellite thermal observations positions surface urban heat islands (SUHI) as a primary measure for such applications at the city scale. However, satellite-inherent biases pose considerable uncertainties. To improve the representation of human-relevant heat exposure, this study proposes a simple but effective satellite-based measure- ground urban heat island (GUHI), focusing solely on radiant temperatures from urban ground elements. Leveraging ECOSTRESS land surface temperature product and radiation-based statistical downscaling, diurnally representative GUHIs were evaluated over NYC. The findings reveal that overall GUHI is consistently warmer than SUHI diurnally. However, GUHI exhibits complex spatial contrasts with SUHI, primarily influenced by vegetation coverage. Various indicators associated with urban structures and materials were examined, showing important but dissimilar roles in shaping the spatial dynamics of GUHI and SUHI. This study highlights the value of satellite thermal observations compared to air temperature while addressing uncertainties in widely adopted practices of using them. By improving the depiction of human-related urban heat patterns from Earth observations, this research offers valuable insight and more reliable measures to address the urgent requirements for urban heat risk management globally.
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Affiliation(s)
- Leiqiu Hu
- University of Alabama in HuntsvilleHuntsvilleALUSA
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Ordóñez C, Kendal D, Davern M, Conway T. Having a tree in front of one's home is associated with GREATER subjective wellbeing in adult residents in Melbourne, Australia, and Toronto, Canada. ENVIRONMENTAL RESEARCH 2024; 250:118445. [PMID: 38360163 DOI: 10.1016/j.envres.2024.118445] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2023] [Revised: 02/06/2024] [Accepted: 02/07/2024] [Indexed: 02/17/2024]
Abstract
While urban trees can be important determinants of human health and wellbeing in world cities, the specific influence of nearby urban trees upon human wellbeing has not been adequately explored. While many studies have associated urban greenery abundance with wellbeing scores, many measures of urban greenery do not specify the type of vegetation or the impact of co-location. Here we fill this gap by associating self-reported measures of the presence of nearby trees (tree in front of one's home) with validated subjective wellbeing (SWB) scores. We also tested for the mediating role of what people thought about trees and nature, with a focus on the values people associate with urban trees and nature relatedness (NR). We used electronic panel survey data based on a demographic and geographical representative sample of more than 3400 residents living in Toronto, Canada, and Melbourne, Australia. We analysed these data using regression-based mediation and path analyses. We found that having a tree in front of one's home was strongly and positively associated with SWB scores in both cities with similar results (Melbourne, β = 0.17, p < 0.05; Toronto, β = 0.18, p < 0.05), while accounting for NR, values associated with urban trees, and demographics (e.g., age, education, home ownership). The mediating role of NR and values was small. The specific pathways of association between tree in front of one's home, SWB, NR, and values, varied by city, when accounting for demographics. We discuss how increasing the abundance of nearby urban trees in cities may also increase human wellbeing.
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Affiliation(s)
- Camilo Ordóñez
- Department of Geography, Geomatics and Environment, University of Toronto at Mississauga, 3359 Mississauga Road, Mississauga, ON L5L 1C6, Canada; School of Ecosystem and Forest Science, Burnley campus, Faculty of Science, The University of Melbourne, 500 Yarra Boulevard, Richmond, Victoria, 3121, Australia.
| | - Dave Kendal
- Future in Nature Pty Ltd, Australia; Melbourne School of Design, The University of Melbourne, Melbourne, Australia
| | - Melanie Davern
- Health Place and Society, Centre for Urban Research, RMIT University, 124 La Trobe Street, Melbourne, Victoria 3000, Australia
| | - Tenley Conway
- Department of Geography, Geomatics and Environment, University of Toronto at Mississauga, 3359 Mississauga Road, Mississauga, ON L5L 1C6, Canada
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Pattnaik N, Honold M, Franceschi E, Moser-Reischl A, Rötzer T, Pretzsch H, Pauleit S, Rahman MA. Growth and cooling potential of urban trees across different levels of imperviousness. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2024; 361:121242. [PMID: 38810461 DOI: 10.1016/j.jenvman.2024.121242] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2024] [Revised: 05/10/2024] [Accepted: 05/24/2024] [Indexed: 05/31/2024]
Affiliation(s)
- Nayanesh Pattnaik
- Strategic Landscape Planning and Management, School of Life Sciences, Technical University of Munich, Emil-Ramann-Str. 6, 85354, Freising, Germany.
| | - Martin Honold
- Forest Growth and Yield Science, School of Life Sciences, Technical University of Munich, Hans-Carl-von-Carlowitz-Platz 2, 85354, Freising, Germany
| | - Eleonora Franceschi
- Forest Growth and Yield Science, School of Life Sciences, Technical University of Munich, Hans-Carl-von-Carlowitz-Platz 2, 85354, Freising, Germany
| | - Astrid Moser-Reischl
- Strategic Landscape Planning and Management, School of Life Sciences, Technical University of Munich, Emil-Ramann-Str. 6, 85354, Freising, Germany; Forest Growth and Yield Science, School of Life Sciences, Technical University of Munich, Hans-Carl-von-Carlowitz-Platz 2, 85354, Freising, Germany
| | - Thomas Rötzer
- Forest Growth and Yield Science, School of Life Sciences, Technical University of Munich, Hans-Carl-von-Carlowitz-Platz 2, 85354, Freising, Germany
| | - Hans Pretzsch
- Forest Growth and Yield Science, School of Life Sciences, Technical University of Munich, Hans-Carl-von-Carlowitz-Platz 2, 85354, Freising, Germany; Sustainable Forest Management Research Institute IuFOR, University Valladolid, Spain
| | - Stephan Pauleit
- Strategic Landscape Planning and Management, School of Life Sciences, Technical University of Munich, Emil-Ramann-Str. 6, 85354, Freising, Germany
| | - Mohammad A Rahman
- Strategic Landscape Planning and Management, School of Life Sciences, Technical University of Munich, Emil-Ramann-Str. 6, 85354, Freising, Germany; The University of Melbourne, Burnley, Victoria, Australia
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Xu C, Huang Q, Haase D, Dong Q, Teng Y, Su M, Yang Z. Cooling Effect of Green Spaces on Urban Heat Island in a Chinese Megacity: Increasing Coverage versus Optimizing Spatial Distribution. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2024; 58:5811-5820. [PMID: 38502088 DOI: 10.1021/acs.est.3c11048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/20/2024]
Abstract
Enhancing the cooling effectiveness of green spaces (GSs) is crucial for improving urban thermal environments in the context of global warming. Increasing GS coverage and optimizing its spatial distribution individually proved to be effective urban cooling measures. However, their comparative cooling effectiveness and potential interaction remain unclear. Here, using the moving window approach and random forest algorithm, we established a robust model (R2 = 0.89 ± 0.01) to explore the relationship between GS and land surface temperature (LST) in the Chinese megacity of Guangzhou. Subsequently, the response of LST to varying GS coverage and its spatial distribution was simulated, both individually and in combination. The results indicate that GS with higher coverage and more equitable spatial distribution is conducive to urban heat mitigation. Increasing GS coverage was found to lower the city's average LST by up to 4.73 °C, while optimizing GS spatial distribution led to a decrease of 1.06 °C. Meanwhile, a synergistic cooling effect was observed when combining both measures, resulting in additional cooling benefits (0.034-0.341 °C). These findings provide valuable insights into the cooling potential of GS and crucial guidance for urban green planning aimed at heat mitigation in cities.
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Affiliation(s)
- Chao Xu
- Institute of Geography, Humboldt University of Berlin, Berlin 12489, Germany
| | - Qianyuan Huang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Beijing Normal University, Beijing 100875, China
| | - Dagmar Haase
- Institute of Geography, Humboldt University of Berlin, Berlin 12489, Germany
- Department of Computational Landscape Ecology, Helmholtz Centre for Environmental Research - UFZ, Leipzig 04318, Germany
| | - Qi Dong
- Faculty of Geo-information Science and Earth Observation (ITC), University of Twente, Enschede 7522 NB, Netherlands
| | - Yanmin Teng
- Research Center for Eco-Environmental Engineering, Dongguan University of Technology, Dongguan 523808, China
| | - Meirong Su
- Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of Education, School of Ecology, Environment and Resources, Guangdong University of Technology, Guangzhou 510006, China
| | - Zhifeng Yang
- Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of Education, School of Ecology, Environment and Resources, Guangdong University of Technology, Guangzhou 510006, China
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10
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Wang Y, Mao J, Brelsford CM, Ricciuto DM, Yuan F, Shi X, Rastogi D, Mayes MM, Kao SC, Warren JM, Griffiths NA, Cheng X, Weston DJ, Zhou Y, Gu L, Thornton PE. Thermal, water, and land cover factors led to contrasting urban and rural vegetation resilience to extreme hot months. PNAS NEXUS 2024; 3:pgae147. [PMID: 38638834 PMCID: PMC11026108 DOI: 10.1093/pnasnexus/pgae147] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/24/2024] [Accepted: 03/28/2024] [Indexed: 04/20/2024]
Abstract
With continuing global warming and urbanization, it is increasingly important to understand the resilience of urban vegetation to extreme high temperatures, but few studies have examined urban vegetation at large scale or both concurrent and delayed responses. In this study, we performed an urban-rural comparison using the Enhanced Vegetation Index and months that exceed the historical 90th percentile in mean temperature (referred to as "hot months") across 85 major cities in the contiguous United States. We found that hot months initially enhanced vegetation greenness but could cause a decline afterwards, especially for persistent (≥4 months) and intense (≥+2 °C) episodes in summer. The urban responses were more positive than rural in the western United States or in winter, but more negative during spring-autumn in the eastern United States. The east-west difference can be attributed to the higher optimal growth temperatures and lower water stress levels of the western urban vegetation than the rural. The urban responses also had smaller magnitudes than the rural responses, especially in deciduous forest biomes, and least in evergreen forest biomes. Within each biome, analysis at 1 km pixel level showed that impervious fraction and vegetation cover, local urban heat island intensity, and water stress were the key drivers of urban-rural differences. These findings advance our understanding of how prolonged exposure to warm extremes, particularly within urban environments, affects vegetation greenness and vitality. Urban planners and ecosystem managers should prioritize the long and intense events and the key drivers in fostering urban vegetation resilience to heat waves.
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Affiliation(s)
- Yaoping Wang
- Environmental Sciences Division and Climate Change Science Institute, Oak Ridge National Laboratory, Oak Ridge, TN 37830, USA
| | - Jiafu Mao
- Environmental Sciences Division and Climate Change Science Institute, Oak Ridge National Laboratory, Oak Ridge, TN 37830, USA
| | - Christa M Brelsford
- Geospatial Science and Human Security Division, Oak Ridge National Laboratory, Oak Ridge, TN 37830, USA
- Analytics, Intelligence and Technology Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
| | - Daniel M Ricciuto
- Environmental Sciences Division and Climate Change Science Institute, Oak Ridge National Laboratory, Oak Ridge, TN 37830, USA
| | - Fengming Yuan
- Environmental Sciences Division and Climate Change Science Institute, Oak Ridge National Laboratory, Oak Ridge, TN 37830, USA
| | - Xiaoying Shi
- Environmental Sciences Division and Climate Change Science Institute, Oak Ridge National Laboratory, Oak Ridge, TN 37830, USA
| | - Deeksha Rastogi
- Computational Science and Engineering Division, Oak Ridge National Laboratory, Oak Ridge, TN 37830, USA
| | - Melanie M Mayes
- Environmental Sciences Division and Climate Change Science Institute, Oak Ridge National Laboratory, Oak Ridge, TN 37830, USA
| | - Shih-Chieh Kao
- Environmental Sciences Division and Climate Change Science Institute, Oak Ridge National Laboratory, Oak Ridge, TN 37830, USA
| | - Jeffrey M Warren
- Environmental Sciences Division and Climate Change Science Institute, Oak Ridge National Laboratory, Oak Ridge, TN 37830, USA
| | - Natalie A Griffiths
- Environmental Sciences Division and Climate Change Science Institute, Oak Ridge National Laboratory, Oak Ridge, TN 37830, USA
| | - Xinghua Cheng
- Department of Natural Resources and the Environment, University of Connecticut, Storrs, CT 06269, USA
| | - David J Weston
- Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37830, USA
| | - Yuyu Zhou
- Department of Geography, The University of Hong Kong, Hong Kong, 999077, China
| | - Lianhong Gu
- Environmental Sciences Division and Climate Change Science Institute, Oak Ridge National Laboratory, Oak Ridge, TN 37830, USA
| | - Peter E Thornton
- Environmental Sciences Division and Climate Change Science Institute, Oak Ridge National Laboratory, Oak Ridge, TN 37830, USA
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11
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Filazzola A, Johnson MTJ, Barrett K, Hayes S, Shrestha N, Timms L, MacIvor JS. The great urban shift: Climate change is predicted to drive mass species turnover in cities. PLoS One 2024; 19:e0299217. [PMID: 38536797 PMCID: PMC10971775 DOI: 10.1371/journal.pone.0299217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2023] [Accepted: 02/06/2024] [Indexed: 05/01/2024] Open
Abstract
Human experiences with nature are important for our culture, economy, and health. Anthropogenically-driven climate change is causing widespread shifts in biodiversity and resident urban wildlife are no exception. We modelled over 2,000 animal species to predict how climate change will impact terrestrial wildlife within 60 Canadian and American cities. We found evidence of an impending great urban shift where thousands of species will disappear across the selected cities, being replaced by new species, or not replaced at all. Effects were largely species-specific, with the most negatively impacted taxa being amphibians, canines, and loons. These predicted shifts were consistent across scenarios of greenhouse gas emissions, but our results show that the severity of change will be defined by our action or inaction to mitigate climate change. An impending massive shift in urban wildlife will impact the cultural experiences of human residents, the delivery of ecosystem services, and our relationship with nature.
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Affiliation(s)
- Alessandro Filazzola
- Centre for Urban Environments, University of Toronto Mississauga, Mississauga, Ontario, Canada
- Apex Resource Management Solutions, Ottawa, Ontario, Canada
| | - Marc T. J. Johnson
- Centre for Urban Environments, University of Toronto Mississauga, Mississauga, Ontario, Canada
- Department of Biology, University of Toronto Mississauga, Mississauga, Ontario, Canada
| | | | - Sue Hayes
- Toronto and Region Conservation Authority, Concord, ON, Canada
| | | | - Laura Timms
- Department of Watershed Knowledge, Credit Valley Conservation, Mississauga, Ontario, Canada
| | - James Scott MacIvor
- Centre for Urban Environments, University of Toronto Mississauga, Mississauga, Ontario, Canada
- Department of Biological Sciences, University of Toronto Scarborough, Toronto, Ontario Canada
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12
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Yang L, Li Q, Li Q, Zhao L, Luo Z, Liu Y. Different explanations for surface and canopy urban heat island effects in relation to background climate. iScience 2024; 27:108863. [PMID: 38361609 PMCID: PMC10867416 DOI: 10.1016/j.isci.2024.108863] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2023] [Revised: 11/28/2023] [Accepted: 01/08/2024] [Indexed: 02/17/2024] Open
Abstract
The background climatic conditions and urban morphology greatly influence urban heat island effects (UHIs), but one-size-fits-all solutions are frequently employed to mitigate UHIs. Here, attribution models for surface UHIs (SUHIs) and canopy UHIs (CUHIs) were developed to describe UHI formation. The contribution of factors to SUHIs and CUHIs shows similar dependencies on background climate and urban morphology. Furthermore, the factors that mainly contributed to CUHIs were more complex, and anthropogenic heat was the more critical factor. Influence from urban morphology also highlights that there is no one-size-fit-all solution for heat mitigation at the neighborhood. In particular, maintaining a low building density should be prioritized, especially mitigating CUHIs. Moreover, it is more effective to prioritize urban irrigation maintenance over increasing green cover in arid regions but the opposite in humid regions. The work can provide scientific evidence to support developing general and regional guidelines for urban heat mitigation.
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Affiliation(s)
- Liu Yang
- State Key Laboratory of Green Building, Department of Architecture, Xi’an University of Architecture and Technology, Xi’an, Shaanxi 710055, P.R. China
| | - Qi Li
- State Key Laboratory of Green Building, Department of Architecture, Xi’an University of Architecture and Technology, Xi’an, Shaanxi 710055, P.R. China
- State Key Laboratory of Subtropical Building and Urban Science, School of Architecture, South China University of Technology, Guangzhou 510640, P.R. China
| | - Qiong Li
- State Key Laboratory of Subtropical Building and Urban Science, School of Architecture, South China University of Technology, Guangzhou 510640, P.R. China
| | - Lei Zhao
- Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | - Zhiwen Luo
- Welsh School of Architecture, Cardiff University, Cardiff, UK
| | - Yan Liu
- State Key Laboratory of Green Building, Department of Architecture, Xi’an University of Architecture and Technology, Xi’an, Shaanxi 710055, P.R. China
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13
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Xu Z, Zhao S. Fine-grained urban blue-green-gray landscape dataset for 36 Chinese cities based on deep learning network. Sci Data 2024; 11:266. [PMID: 38438364 PMCID: PMC10912193 DOI: 10.1038/s41597-023-02844-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2023] [Accepted: 12/11/2023] [Indexed: 03/06/2024] Open
Abstract
Detailed and accurate urban landscape mapping, especially for urban blue-green-gray (UBGG) continuum, is the fundamental first step to understanding human-nature coupled urban systems. Nevertheless, the intricate spatial heterogeneity of urban landscapes within cities and across urban agglomerations presents challenges for large-scale and fine-grained mapping. In this study, we generated a 3 m high-resolution UBGG landscape dataset (UBGG-3m) for 36 Chinese metropolises using a transferable multi-scale high-resolution convolutional neural network and 336 Planet images. To train the network for generalization, we also created a large-volume UBGG landscape sample dataset (UBGGset) covering 2,272 km2 of urban landscape samples at 3 m resolution. The classification results for five cities across diverse geographic regions substantiate the superior accuracy of UBGG-3m in both visual interpretation and quantitative evaluation (with an overall accuracy of 91.2% and FWIoU of 83.9%). Comparative analyses with existing datasets underscore the UBGG-3m's great capability to depict urban landscape heterogeneity, providing a wealth of new data and valuable insights into the complex and dynamic urban environments in Chinese metropolises.
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Affiliation(s)
- Zhiyu Xu
- College of Urban and Environmental Sciences, Peking University, Beijing, 100871, China
| | - Shuqing Zhao
- College of Ecology and the Environment, Hainan University, Haikou, 570228, China.
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14
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Ahdoot S, Baum CR, Cataletto MB, Hogan P, Wu CB, Bernstein A. Climate Change and Children's Health: Building a Healthy Future for Every Child. Pediatrics 2024; 153:e2023065504. [PMID: 38374809 DOI: 10.1542/peds.2023-065504] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 12/19/2023] [Indexed: 02/21/2024] Open
Abstract
The warming of our planet matters to every child. Driven by fossil fuel-generated greenhouse gas emissions, climate conditions stable since the founding of modern pediatrics in the mid-nineteenth century have shifted, and old certainties are falling away. Children's physical and mental health are threatened by climate change through its effects on temperature, precipitation, and extreme weather; ecological disruption; and community disruption. These impacts expose and amplify existing inequities and create unprecedented intergenerational injustice. Fossil fuel extraction and combustion cause harm today and reach centuries into the future, jeopardizing the health, safety, and prosperity of today's children and future generations. Appreciating the unique vulnerability of their patients, pediatricians have become leading health advocates for climate actions necessary to protect all living and future children. Policies that reduce reliance on fossil fuels and promote cleaner air, facilitate walking and bicycling, encourage more sustainable diets, increase access to nature, and develop more connected communities lead to immediate gains in child health and equity, and build a foundation for generations of children to thrive.
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Affiliation(s)
- Samantha Ahdoot
- University of Virginia School of Medicine, Charlottesville, Virginia
| | - Carl R Baum
- Section of Pediatric Emergency Medicine, Yale School of Medicine, New Haven, Connecticut
| | - Mary Bono Cataletto
- Division of Pediatric Pulmonology and Sleep Medicine, Department of Pediatrics, New York University Long Island School of Medicine, Mineola, New York
| | - Patrick Hogan
- Pediatric Residency Program, Oregon Health & Science University, Portland, Oregon
| | - Christina B Wu
- O'Neill Center for Global and National Health Law, Georgetown University Law Center, Washington, District of Columbia
| | - Aaron Bernstein
- Division of General Pediatrics, Boston Children's Hospital, and Center for Climate, Health, and the Global Environment, Harvard T.H. Chan School of Public Health, Boston, Massachusetts
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15
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Martin E, El-Galmady S, Johnson MTJ. Urban socioeconomic variation influences the ecology and evolution of trophic interactions. Ecol Lett 2024; 27:e14407. [PMID: 38504478 DOI: 10.1111/ele.14407] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2023] [Revised: 02/25/2024] [Accepted: 02/26/2024] [Indexed: 03/21/2024]
Abstract
As urbanization expands, it is becoming increasingly important to understand how anthropogenic activity is affecting ecological and evolutionary processes. Few studies have examined how human social patterns within cities can modify eco-evolutionary dynamics. We tested how socioeconomic variation corresponds with changes in trophic interactions and natural selection on prey phenotypes using the classic interaction between goldenrod gall flies (Eurosta solidaginis) and their natural enemies: birds, beetles, and parasitoid wasps. We sampled galls from 84 sites across neighbourhoods with varying socioeconomic levels, and quantified the frequency of predation/parasitism on flies and natural selection by each enemy. We found that bird predation was higher in the highest income neighbourhoods, increasing the strength of selection for smaller galls. Wasp and beetle attack, but not their strength of selection, increased in lower income neighbourhoods. We show that socioeconomic variation in cities can have strong unintended consequences for the ecology and evolution of trophic interactions.
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Affiliation(s)
- Ella Martin
- Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, Ontario, Canada
- Department of Biology, University of Toronto Mississauga, Mississauga, Ontario, Canada
- Centre for Urban Environments, University of Toronto Mississauga, Mississauga, Ontario, Canada
| | - Samer El-Galmady
- Department of Biology, University of Toronto Mississauga, Mississauga, Ontario, Canada
| | - Marc T J Johnson
- Department of Biology, University of Toronto Mississauga, Mississauga, Ontario, Canada
- Centre for Urban Environments, University of Toronto Mississauga, Mississauga, Ontario, Canada
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16
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Ahdoot S, Baum CR, Cataletto MB, Hogan P, Wu CB, Bernstein A. Climate Change and Children's Health: Building a Healthy Future for Every Child. Pediatrics 2024; 153:e2023065505. [PMID: 38374808 DOI: 10.1542/peds.2023-065505] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 12/19/2023] [Indexed: 02/21/2024] Open
Abstract
Observed changes in temperature, precipitation patterns, sea level, and extreme weather are destabilizing major determinants of human health. Children are at higher risk of climate-related health burdens than adults because of their unique behavior patterns; developing organ systems and physiology; greater exposure to air, food, and water contaminants per unit of body weight; and dependence on caregivers. Climate change harms children through numerous pathways, including air pollution, heat exposure, floods and hurricanes, food insecurity and nutrition, changing epidemiology of infections, and mental health harms. As the planet continues to warm, climate change's impacts will worsen, threatening to define the health and welfare of children at every stage of their lives. Children who already bear higher burden of disease because of living in low-wealth households and communities, lack of access to high quality education, and experiencing racism and other forms of unjust discrimination bear greater risk of suffering from climate change hazards. Climate change solutions, advanced through collaborative work of pediatricians, health systems, communities, corporations, and governments lead to immediate gains in child health and equity and build a foundation for generations of children to thrive. This technical report reviews the nature of climate change and its associated child health effects and supports the recommendations in the accompanying policy statement on climate change and children's health.
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Affiliation(s)
- Samantha Ahdoot
- University of Virginia School of Medicine, Charlottesville, Virginia
| | - Carl R Baum
- Section of Pediatric Emergency Medicine, Yale School of Medicine, New Haven, Connecticut
| | - Mary Bono Cataletto
- Division of Pediatric Pulmonology and Sleep Medicine, Department of Pediatrics, New York University Long Island School of Medicine, Mineola, New York
| | - Patrick Hogan
- Pediatric Residency Program, Oregon Health & Science University, Portland, Oregon
| | - Christina B Wu
- O'Neill Center for Global and National Health Law, Georgetown University Law Center, Washington, District of Columbia
| | - Aaron Bernstein
- Division of General Pediatrics, Boston Children's Hospital, and Center for Climate, Health, and the Global Environment, Harvard T.H. Chan School of Public Health, Boston, Massachusetts
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17
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Locke DH, Baker M, Alonzo M, Yang Y, Ziter CD, Murphy-Dunning C, O'Neil-Dunne JP. Variation the in relationship between urban tree canopy and air temperature reduction under a range of daily weather conditions. Heliyon 2024; 10:e25041. [PMID: 38352758 PMCID: PMC10862499 DOI: 10.1016/j.heliyon.2024.e25041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2023] [Revised: 01/18/2024] [Accepted: 01/18/2024] [Indexed: 02/16/2024] Open
Abstract
Mitigating heat is a vital ecosystem service of trees, particularly with climate change. Land surface temperature measures captured at a single time of day (in the morning) dominate the urban heat island literature. Less is known about how local tree canopy and impervious surface regulate air temperature throughout the day, and/or across many days with varied weather conditions, including cloud cover. We use bike-mounted air temperature sensors throughout the day in New Haven, Connecticut, USA, from 2019 to 2021 and generalized additive mixed models across 156 rides to estimate the daily variation in cooling benefits associated with tree canopy cover, and warming from impervious surface cover in 90 m buffers surrounding bike observations. Cooling is inferred by subtracting the bicycle-observed temperature from a reference station. The cooling benefits from tree canopy cover were strongest in the midday (11:00-14:00, -1.62 °C), afternoon (14:00-17:00, -1.19 °C), and morning (8:00-11:00, -1.15 °C) on clear days. The cooling effect was comparatively smaller on cloudy mornings -0.92 °C and afternoons -0.51 °C. Warming from impervious surfaces was most pronounced in the evening (17:00-20:00, 1.11 °C) irrespective of clouds, and during cloudy nights (20:00-23:00) and cloudy mornings 1.03 °C 95 % CI [1.03, 1.04]. Among the hottest observed days (top 25th percentile of reference station daily maxima), tree canopy was associated with lower temperatures on clear afternoons -1.78 °C [-1.78, -1.78], cloudy midday -1.17 °C [-1.19, -1.15], clear midday -1.12 °C [-1.12, -1.11]. We add a broader spectrum of weather conditions by explicitly including clouds, and greater temporal resolution by measuring throughout the day to bike-based urban heat research. Future mobile sampling campaigns may broaden the spatial extent with more environmental variation, representing an opportunity for public science and engagement.
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Affiliation(s)
- Dexter Henry Locke
- USDA Forest Service, Northern Research Station, Baltimore Field Station, Suite 350, 5523 Research Park Drive, Baltimore, MD, 21228, USA
| | - Matthew Baker
- Department of Geography & Environmental Systems, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, MD, 21250, USA
| | - Michael Alonzo
- Department of Environmental Science, American University, Hall of Science – 328 4400 Massachusetts Ave, NW Washington, DC, 20016-8014, USA
| | - Yichen Yang
- Yale School of the Environment, Environmental Science Center, Room 300, 21 Sachem Street, New Haven, CT, 06511, USA
| | - Carly D. Ziter
- Department of Biology, Concordia University, 7141 Sherbrooke West, Montreal, Quebec, H4B 1R6, Canada
| | - Colleen Murphy-Dunning
- Hixon Center Urban Sustainabilitiy, Urban Resources Initiative, Yale School of the Environment, 301 Prospect St #1, New Haven, CT, 06511, USA
| | - Jarlath P.M. O'Neil-Dunne
- Spatial Analysis Lab, Rubenstein School of Environment and Natural Resources, University of Vermont, 81 Carrigan Drive, Burlington, VT, 05405, USA
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18
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Ettinger AK, Bratman GN, Carey M, Hebert R, Hill O, Kett H, Levin P, Murphy-Williams M, Wyse L. Street trees provide an opportunity to mitigate urban heat and reduce risk of high heat exposure. Sci Rep 2024; 14:3266. [PMID: 38351140 PMCID: PMC10864265 DOI: 10.1038/s41598-024-51921-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2023] [Accepted: 01/11/2024] [Indexed: 02/16/2024] Open
Abstract
Climate change is exacerbating the need for urban greening and the associated environmental and human well-being benefits. Trees can help mitigate urban heat, but more detailed understanding of cooling effects of green infrastructure are needed to guide management decisions and deploy trees as effective and equitable climate adaptation infrastructure. We investigated how urban trees affect summer air temperature along sidewalks within a neighborhood of Tacoma, Washington, USA, and to what extent urban trees reduce risks of high summer temperatures (i.e., the levels regulated by state outdoor heat exposure rules intended to reduce heat-related illnesses). Air temperature varied by 2.57 °C, on average, across our study area, and the probability of daytime temperatures exceeding regulated high temperature thresholds was up to five times greater in locations with no canopy cover within 10 m compared to those with 100% cover. Air temperatures decreased linearly with increasing cover within 10 m, suggesting that every unit of added tree cover can help cool the air. Our findings highlight the value of trees in mitigating urban heat, especially given expected warming with climate change. Protecting existing urban trees and increasing tree cover (e.g., by planting street trees), are important actions to enhance climate change resilience of urban areas.
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Affiliation(s)
- Ailene K Ettinger
- The Nature Conservancy of Washington, 74 Wall Street, Seattle, WA, 98121, USA.
| | - Gregory N Bratman
- School of Environmental and Forest Sciences, University of Washington, Seattle, WA, 98195, USA
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA, 98195, USA
| | - Michael Carey
- Urban Forest Program, City of Tacoma, Tacoma, WA, USA
| | - Ryan Hebert
- Urban Forest Program, City of Tacoma, Tacoma, WA, USA
| | - Olivia Hill
- School of Environmental and Forest Sciences, University of Washington, Seattle, WA, 98195, USA
| | - Hannah Kett
- The Nature Conservancy of Washington, 74 Wall Street, Seattle, WA, 98121, USA
| | - Phillip Levin
- School of Marine and Environmental Affairs, University of Washington, Seattle, WA, 98195, USA
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19
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Romanelli JP, Piana MR, Klaus VH, Brancalion PHS, Murcia C, Cardou F, Wallace KJ, Adams C, Martin PA, Burton PJ, Diefenderfer HL, Gornish ES, Stanturf J, Beyene M, Santos JPB, Rodrigues RR, Cadotte MW. Convergence and divergence in science and practice of urban and rural forest restoration. Biol Rev Camb Philos Soc 2024; 99:295-312. [PMID: 37813383 DOI: 10.1111/brv.13022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2023] [Revised: 09/26/2023] [Accepted: 09/28/2023] [Indexed: 10/11/2023]
Abstract
Forest restoration has never been higher on policymakers' agendas. Complex and multi-dimensional arrangements across the urban-rural continuum challenge restorationists and require integrative approaches to strengthen environmental protection and increase restoration outcomes. It remains unclear if urban and rural forest restoration are moving towards or away from each other in practice and research, and whether comparing research outcomes can help stakeholders to gain a clearer understanding of the interconnectedness between the two fields. This study aims to identify the challenges and opportunities for enhancing forest restoration in both urban and rural systems by reviewing the scientific evidence, engaging with key stakeholders and using an urban-rural forest restoration framework. Using the Society for Ecological Restoration's International Principles as discussion topics, we highlight aspects of convergence and divergence between the two fields to broaden our understanding of forest restoration and promote integrative management approaches to address future forest conditions. Our findings reveal that urban and rural forest restoration have convergent and divergent aspects. We emphasise the importance of tailoring goals and objectives to specific contexts and the need to design different institutions and incentives based on the social and ecological needs and goals of stakeholders in different regions. Additionally, we discuss the challenges of achieving high levels of ecological restoration and the need to go beyond traditional ecology to plan, implement, monitor, and adaptively manage restored forests. We suggest that rivers and watersheds could serve as a common ground linking rural and urban landscapes and that forest restoration could interact with other environmental protection measures. We note the potential for expanding the creative vision associated with increasing tree-containing environments in cities to generate more diverse and resilient forest restoration outcomes in rural settings. This study underscores the value of integrative management approaches in addressing future forest conditions across the urban-rural continuum. Our framework provides valuable insights for policymakers, researchers, and decision-makers to advance the field of forest restoration and address the challenges of restoration across the urban-rural continuum. The rural-urban interface serves as a convergence point for forest restoration, and both urban and rural fields can benefit from each other's expertise.
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Affiliation(s)
- João P Romanelli
- Laboratory of Ecology and Forest Restoration (LERF), Department of Biological Sciences, 'Luiz de Queiroz' College of Agriculture, University of São Paulo, Av. Pádua Dias, 11, Piracicaba, SP, 13418-900, Brazil
| | - Max R Piana
- Northern Research Station, USDA Forest Service, 160 Holdsworth Way, Amherst, MA, 01003, USA
| | - Valentin H Klaus
- ETH Zurich, Institute of Agricultural Sciences, Universitätstr. 2, Zurich, 8092, Switzerland
| | - Pedro H S Brancalion
- Department of Forest Sciences, 'Luiz de Queiroz' College of Agriculture, University of São Paulo, Av. Pádua Dias, 11, Piracicaba, SP, 13418-900, Brazil
| | - Carolina Murcia
- Department of Biology, University of Florida, Gainesville, FL, 32611, USA
| | - Françoise Cardou
- Department of Biological Sciences, University of Toronto Scarborough, 1265 Military Trail, Toronto, ON, M1C 1A4, Canada
| | - Kiri Joy Wallace
- Te Tumu Whakaora Taiao - Environmental Research Institute, University of Waikato, Private Bag 3105, Hamilton, 3240, New Zealand
| | - Cristina Adams
- Forest Governance Research Group (GGF), Institute of Energy and Environment (IEE), University of São Paulo, Av. Prof. Luciano Gualberto, 1289, São Paulo, SP, 05508-010, Brazil
| | - Philip A Martin
- Basque Centre for Climate Change (BC3), Edificio sede no 1, planta 1, Parque científico UPV/EHU, Barrio Sarriena s/n, Leioa, Bizkaia, 48940, Spain
| | - Philip J Burton
- Department of Ecosystem Science & Management, University of Northern British Columbia, Prince George, BC, V2N 4Z9, Canada
- Symbios Research & Restoration, Smithers, BC, V0J 2N4, Canada
| | - Heida L Diefenderfer
- University of Washington and Pacific Northwest National Laboratory, 1529 West Sequim Bay Road, Sequim, WA, 98382, USA
| | - Elise S Gornish
- School of Natural Resources and the Environment, University of Arizona, Tucson, AZ, 85721, USA
| | - John Stanturf
- Institute of Forestry and Rural Engineering, Estonian University of Life Sciences, Kreutzwaldi 5, Tartu, 51014, Estonia
| | - Menilek Beyene
- Department of Physical and Environmental Sciences, University of Toronto Scarborough, 1265 Military Trail, Toronto, ON, M1C 1A4, Canada
| | - João Paulo Bispo Santos
- Laboratory of Ecology and Forest Restoration (LERF), Department of Biological Sciences, 'Luiz de Queiroz' College of Agriculture, University of São Paulo, Av. Pádua Dias, 11, Piracicaba, SP, 13418-900, Brazil
| | - Ricardo R Rodrigues
- Laboratory of Ecology and Forest Restoration (LERF), Department of Biological Sciences, 'Luiz de Queiroz' College of Agriculture, University of São Paulo, Av. Pádua Dias, 11, Piracicaba, SP, 13418-900, Brazil
| | - Marc W Cadotte
- Department of Biological Sciences, University of Toronto Scarborough, 1265 Military Trail, Toronto, ON, M1C 1A4, Canada
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Huang Q, Xu C, Haase D, Teng Y, Su M, Yang Z. Heterogeneous effects of the availability and spatial configuration of urban green spaces on their cooling effects in China. ENVIRONMENT INTERNATIONAL 2024; 183:108385. [PMID: 38109832 DOI: 10.1016/j.envint.2023.108385] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2023] [Revised: 11/15/2023] [Accepted: 12/11/2023] [Indexed: 12/20/2023]
Abstract
The impacts of the availability and spatial configuration of urban green spaces (UGS) on their cooling effects can vary with background climate conditions. However, large-scale studies that assess the potential heterogeneous relationships of UGS availability and spatial configuration with urban thermal environment are still lacking. In this study, we investigated the impacts of UGS availability and spatial configuration on urban land surface temperature (LST) taking 306 cities in China as a case study covering a multi-biome-scale. We first calculated the availability of surrounding UGS for urban built-up pixels in each city using a distance-weighted approach, and its spatial configuration was quantified through the Gini coefficient. Then, we employed various regression models to explore how the impacts of UGS availability and the Gini coefficient on LST varies across different LST quantiles and between day- and nighttime. The results revealed that UGS availability was negatively associated with both daytime and nighttime LST, while the Gini coefficient showed a positive impact solely on daytime LST, indicating that an adequate and equally distributed UGS contributes to lower environmental temperatures during the daytime. Furthermore, the impact of UGS availability on LST decreased during both day- and nighttime with increased background LST quantiles. Whereas the impact of the Gini coefficient increased only with daytime LST quantile levels, with its effect remaining almost insignificant during the night. Our findings provide new insights into the impacts of UGS on urban thermal environment, offering significant implications for urban green infrastructure planning aiming at lowering the urban heat island.
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Affiliation(s)
- Qianyuan Huang
- School of Environment, Beijing Normal University, Beijing 100875, China
| | - Chao Xu
- Institute of Geography, Humboldt University of Berlin, Berlin 12489, Germany.
| | - Dagmar Haase
- Institute of Geography, Humboldt University of Berlin, Berlin 12489, Germany; Department of Computational Landscape Ecology, Helmholtz Centre for Environmental Research - UFZ, Leipzig 04318, Germany
| | - Yanmin Teng
- Research Center for Eco-environmental Engineering, Dongguan University of Technology, Dongguan 523808, China
| | - Meirong Su
- Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of Education, School of Ecology, Environment and Resources, Guangdong University of Technology, Guangzhou 510006, China.
| | - Zhifeng Yang
- Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of Education, School of Ecology, Environment and Resources, Guangdong University of Technology, Guangzhou 510006, China
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21
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Liu Y, Huang X, Yang Q, Jing W, Yang J. Effects of landscape on thermal livability at the community scale based on fine-grained geographic information: A case study of Shenzhen. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 905:167091. [PMID: 37716681 DOI: 10.1016/j.scitotenv.2023.167091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2023] [Revised: 08/23/2023] [Accepted: 09/13/2023] [Indexed: 09/18/2023]
Abstract
In the current research, the question of how to modify the microclimate through landscape planning to create a livable thermal environment within a residential community area has not been clarified. Therefore, this study investigated the effects of landscape on thermal livability in 2980 communities in Shenzhen, and obtained the following findings: (1) the proportion of trees and the average building height were key indicators to determine the average land surface temperature (LST) of a community, while the two-dimensional building characteristics, particularly shape, similarity, and patch dominance, were mainly responsible for regulating the spatial distribution of LST within a community; (2) at the community scale, the cooling intensity of buildings was strongest when their average height was around 40-60 m, and cooling effect of trees was most pronounced when their proportion achieved 20 %; and (3) the LST threshold for thermal livability in Shenzhen was around 35 °C. In summer, a higher proportion of trees and grass, as well as buildings with higher average heights, larger volume ratios, and more complex three-dimensional structures were favorable to maintain a livable community thermal environment, while in winter, a lower proportion of trees was more encouraged. In addition, a smaller average sky view factor can achieve a community thermal environment that warm in winter and cool in summer. These results are expected to facilitate urban planners to develop community renewal from the perspective of thermal livability.
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Affiliation(s)
- Yue Liu
- Guangzhou Institute of Geography, Guangdong Academy of Sciences, Guangzhou 510070, PR China.
| | - Xin Huang
- School of Remote Sensing and Information Engineering, Wuhan University, Wuhan 430079, PR China; State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan 430079, PR China.
| | - Qiquan Yang
- College of Surveying & Geo-Informatics, Tongji University, Shanghai 200092, PR China.
| | - Wenlong Jing
- Guangzhou Institute of Geography, Guangdong Academy of Sciences, Guangzhou 510070, PR China; Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511485, PR China.
| | - Ji Yang
- Guangzhou Institute of Geography, Guangdong Academy of Sciences, Guangzhou 510070, PR China; Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511485, PR China.
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22
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Ju Y, Dronova I, Rodriguez DA, Bakhtsiyarava M, Farah I. Recent greening may curb urban warming in Latin American cities of better economic conditions. LANDSCAPE AND URBAN PLANNING 2023; 240:None. [PMID: 38046954 PMCID: PMC10570748 DOI: 10.1016/j.landurbplan.2023.104896] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/21/2023] [Revised: 09/04/2023] [Accepted: 09/13/2023] [Indexed: 12/05/2023]
Abstract
Rising temperatures have profound impacts on the well-being of urban residents. However, factors explaining the temporal variability of urban thermal environment, or urban warming, remain insufficiently understood, especially in the Global South. Addressing this gap, we studied the relationship between city-level economic conditions and urban warming, and how urban green space mediated this relationship, focusing on 359 major Latin American cities between 2001 and 2022. While effect sizes varied by economic and temperature measures used, we found that better economic conditions were associated with lower baseline greenness in 2011, which contributed to faster warming. There was modest evidence that this faster warming associated with lower baseline greenness and improved economic conditions was partially offset by cooling from recent greening (2001-2022) in cities of better economic conditions. This offset was more evident in arid cities. Together, these findings provide insights into the urban warming mechanism manifested through the effect of economic conditions on urban green space, for Latin American cities and other high-density cities transforming in a similar context.
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Affiliation(s)
- Yang Ju
- School of Architecture and Urban Planning, Nanjing University, Rm. 810, Jianliang Bldg., No. 22 Hankou Rd., Nanjing, China
| | - Iryna Dronova
- Department of Environmental Science, Policy, and Management, University of California, Berkeley, USA
- Department of Landscape Architecture and Environmental Planning, University of California, Berkeley, USA
| | - Daniel A. Rodriguez
- Department of City and Regional Planning, University of California, Berkeley, USA
- Institute of Transportation Studies, University of California, Berkeley, USA
| | - Maryia Bakhtsiyarava
- Institute of Urban and Regional Development, University of California, Berkeley, USA
| | - Irene Farah
- Department of City and Regional Planning, University of California, Berkeley, USA
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23
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Yao H, Li Z, Geisen S, Qiao Z, Breed MF, Sun X. Degree of urbanization and vegetation type shape soil biodiversity in city parks. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 899:166437. [PMID: 37604369 DOI: 10.1016/j.scitotenv.2023.166437] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Revised: 07/28/2023] [Accepted: 08/18/2023] [Indexed: 08/23/2023]
Abstract
Urbanization negatively impacts aboveground biodiversity, such as bird and insect communities. City parks can reduce these negative impacts by providing important habitat. However, it remains poorly understood how the degree of urbanization and vegetation types within city parks (e.g., lawns, woodland) impact soil biodiversity. Here we investigated the impact of the degree of urbanization (urban vs. suburban) and vegetation type (lawn, shrub-lawn, tree-lawn and tree-shrub mixtures) on soil biodiversity in parkland systems. We used eDNA metabarcoding to characterize soil biodiversity of bacteria, fungi, protists, nematodes, meso- and macrofauna across park vegetation types in urban and suburban regions in Xiamen, China. We observed a strong effect of the degree of urbanization on the richness of different soil biota groups, with higher species richness of protists and meso/macrofauna in urban compared to suburban areas, while the richness of bacteria and fungi did not differ, and the difference of nematode richness depended on vegetation type. At the functional level, increased degree of urbanization associated with greater species richness of bacterivores, plant pathogens and animal parasites. These urbanization effects were at least partly modulated by higher soil phosphorous levels in urban compared to suburban sites. Also, the vegetation type impacted soil biodiversity, particularly fungal richness, with the richness of pathogenic and saprotrophic fungi increasing from lawn to tree-shrub mixtures. Tree-shrub mixtures also had the highest connectedness between biotas and lowest variation in the soil community structure. Overall, we show that soil biodiversity is strongly linked to the degree of urbanization, with overall richness increasing with urbanization, especially in bacterivores, plant pathogens and animal parasites. Targeted management of vegetation types in urban areas should provide a useful way to help mitigate the negative effect of urbanization on soil biodiversity.
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Affiliation(s)
- Haifeng Yao
- Key Laboratory of Urban Environment and Health, Ningbo Observation and Research Station, Fujian Key Laboratory of Watershed Ecology, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; University of Chinese Academy of Sciences, Beijing 100049, China; Zhejiang Key Laboratory of Urban Environmental Processes and Pollution Control, CAS Haixi Industrial Technology Innovation Center in Beilun, Ningbo 315830, China; Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China.
| | - Zhipeng Li
- Key Laboratory of Urban Environment and Health, Ningbo Observation and Research Station, Fujian Key Laboratory of Watershed Ecology, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; Zhejiang Key Laboratory of Urban Environmental Processes and Pollution Control, CAS Haixi Industrial Technology Innovation Center in Beilun, Ningbo 315830, China.
| | - Stefan Geisen
- Laboratory of Nematology, Department of Plant Sciences, Wageningen University & Research, 6700 ES Wageningen, the Netherlands.
| | - Zhihong Qiao
- University of Chinese Academy of Sciences, Beijing 100049, China; Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China.
| | - Martin F Breed
- College of Science and Engineering, Flinders University, Bedford Park, SA 5042, Australia.
| | - Xin Sun
- Key Laboratory of Urban Environment and Health, Ningbo Observation and Research Station, Fujian Key Laboratory of Watershed Ecology, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; Zhejiang Key Laboratory of Urban Environmental Processes and Pollution Control, CAS Haixi Industrial Technology Innovation Center in Beilun, Ningbo 315830, China.
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Xu Z, Zhao S. Scale dependence of urban green space cooling efficiency: A case study in Beijing metropolitan area. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 898:165563. [PMID: 37459981 DOI: 10.1016/j.scitotenv.2023.165563] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2023] [Revised: 06/14/2023] [Accepted: 07/13/2023] [Indexed: 07/24/2023]
Abstract
Urban Green Space (UGS), providing environmental, social and economic benefits simultaneously, has been regarded as a cost-effective Nature-based Solution (NbS) to combat the effects of urban heat island (UHI). Under the dual pressure of increasing demand for limited land resources and mitigating UHI, how to scientifically and effectively use the limited space to obtain the maximum cooling efficiency (scaling of cooling intensity and UGS size) is an important component of strategic urban green planning. However, the scale dependence of UGS cooling effect has not yet been sufficiently quantified, particularly with respect to involving small and medium size UGS. Here, we explored the size-dependent UGS cooling efficiency in Beijing using 10,003 UGS patches extracted from high-resolution remote sensing images. We found that 5922 UGS (59.20 %) exhibited a "cooling island effect", the cooling service of UGS could reduce land surface temperature by 0.06 ± 0.05 °C to 3.81 ± 1.01 °C, and the cooling intensity enhanced nonlinearly with increasing size and closely related to the complexity of UGS shape and vegetation quality. We further showed that the cooling efficiency of small, medium and large UGS was -0.004 ± 0.03 (n = 2201), 0.79 ± 0.01 (n = 3570), 0.19 ± 0.03 (n = 151), respectively, suggesting that strategic urban greening to combat urban heat should target on increasing medium-sized UGS and managing the layout of green space. These findings emphasize the significance of considering and further exploring the scale dependence of UGS cooling effect in mitigating urban heat.
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Affiliation(s)
- Zhiyu Xu
- College of Urban and Environmental Sciences, Peking University, Beijing 100871, China
| | - Shuqing Zhao
- College of Urban and Environmental Sciences, Peking University, Beijing 100871, China; College of Ecology and the Environment, Hainan University, Hainan 570228, China.
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25
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Song J, Gasparrini A, Fischer T, Hu K, Lu Y. Effect Modifications of Overhead-View and Eye-Level Urban Greenery on Heat-Mortality Associations: Small-Area Analyses Using Case Time Series Design and Different Greenery Measurements. ENVIRONMENTAL HEALTH PERSPECTIVES 2023; 131:97007. [PMID: 37728899 PMCID: PMC10510815 DOI: 10.1289/ehp12589] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2022] [Revised: 08/30/2023] [Accepted: 09/05/2023] [Indexed: 09/22/2023]
Abstract
BACKGROUND The protective effect of urban greenery from adverse heat impacts remains inconclusive. Existing inconsistent findings could be attributed to the different estimation techniques used. OBJECTIVES We investigated how effect modifications of urban greenery on heat-mortality associations vary when using different greenery measurements reflecting overhead-view and eye-level urban greenery. METHODS We collected meteorological and daily mortality data for 286 territory planning units between 2005 and 2018 in Hong Kong. Three greenery measurements were extracted for each unit: a) the normalized difference vegetation index (NDVI) from Landsat remote sensing images, b) the percentage of greenspace based on land use data, and c) eye-level street greenery from street view images via a deep learning technique. Time-series analyses were performed using the case time series design with a linear interaction between the temperature term and each of the three greenery measurements. Effect modifications were also estimated for different age groups, sex categories, and cause-specific diseases. RESULTS Higher mortality risks were associated with both moderate and extreme heat, with relative risks (RRs) of 1.022 (95% CI: 1.000, 1.044) and 1.045 (95% CI: 1.013, 1.079) at the 90th and 99th percentiles of temperatures relative to the minimum mortality temperature (MMT). Lower RRs were observed in greener areas whichever of the three greenery measurements was used, but the disparity of RRs between areas with low and high levels of urban greenery was more apparent when using eye-level street greenery as the index at high temperatures (99th percentile relative to MMT), with RRs for low and high levels of greenery, respectively, of 1.096 (95% CI: 1.035, 1.161) and 0.985 (95% CI: 0.920, 1.055) for NDVI (p = 0.0193 ), 1.068 (95% CI: 1.021, 1.117) and 0.990 (95% CI: 0.906, 1.081) for the percentage of greenspace (p = 0.1338 ), and 1.103 (95% CI: 1.034, 1.177) and 0.943 (95% CI: 0.841, 1.057) for eye-level street greenery (p = 0.0186 ). Health discrepancies remained for nonaccidental mortality and cardiorespiratory diseases and were more apparent for older adults (≥ 65 years of age) and females. DISCUSSION This study provides new evidence that eye-level street greenery shows stronger associations with reduced heat-mortality risks compared with overhead-view greenery based on NDVI and percentage of greenspace. The effect modification of urban greenery tends to be amplified as temperatures rise and are more apparent in older adults and females. Heat mitigation strategies and health interventions, in particular with regard to accessible and visible greenery, are needed for helping heat-sensitive subpopulation groups in coping with extreme heat. https://doi.org/10.1289/EHP12589.
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Affiliation(s)
- Jinglu Song
- Department of Urban Planning and Design, Xi’an Jiaotong-Liverpool University, Suzhou, China
| | - Antonio Gasparrini
- Department of Public Health, Environment and Society, London School of Hygiene and Tropical Medicine, London, UK
| | - Thomas Fischer
- Environmental Assessment and Management Research Centre, Department of Geography and Planning, School of Environmental Sciences, University of Liverpool, Liverpool, UK
- Research Unit for Environmental Sciences and Management, Faculty of Natural and Agricultural Sciences, North West University, Potchefstroom, South Africa
| | - Kejia Hu
- Institute of Big Data in Health Science, School of Public Health, Zhejiang University, Hangzhou, China
| | - Yi Lu
- Department of Architecture and Civil Engineering, City University of Hong Kong, Kowloon Tong, Hong Kong, China
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26
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Du H, Zhan W, Liu Z, Scott Krayenhoff E, Chakraborty TC, Zhao L, Jiang L, Dong P, Li L, Huang F, Wang S, Xu Y. Global mapping of urban thermal anisotropy reveals substantial potential biases for remotely sensed urban climates. Sci Bull (Beijing) 2023; 68:1809-1818. [PMID: 37468411 DOI: 10.1016/j.scib.2023.06.032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Revised: 04/26/2023] [Accepted: 04/27/2023] [Indexed: 07/21/2023]
Abstract
Urban thermal anisotropy (UTA) drastically impacts satellite-derived urban surface temperatures and fluxes, and consequently makes it difficult to gain a more comprehensive understanding of global urban climates. However, UTA patterns and associated biases in observed urban climate variables have not been investigated across an adequate number of global cities with diverse contexts; nor is it known whether there are globally measurable factors that are closely related to the UTA intensity (UTAI, quantified as the maximum difference between the nadir and off-nadir urban thermal radiation). Here we investigate the UTAI over more than 5500 cities worldwide using multi-angle land surface temperature (LST) observations from 2003 to 2021 provided by Moderate Resolution Imaging Spectroradiometer (MODIS). The results show that the global mean UTAI can reach 5.1, 2.7, 2.4, and 1.7 K during summer daytime, winter daytime, summer nighttime, and winter nighttime, respectively. Using nadir LST observations as a reference, our analysis reveals that UTA can lead to an underestimation of satellite-based urban surface sensible heat fluxes (H) by 45.4% and surface urban heat island intensity (Is) by 43.0% when using LST observations obtained from sensor viewing zenith angles (VZAs) of ±60°. Practitioners can limit the biases of H and Is within ±10% by using LSTs from sensor VZAs within ±30°. We also find that UTAI is closely related to urban impervious surface percentage and surface air temperature across global cities. These findings have implications for angular normalization of satellite-retrieved instantaneous LST observations across cities worldwide.
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Affiliation(s)
- Huilin Du
- Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology, International Institute for Earth System Science, Nanjing University, Nanjing 210023, China
| | - Wenfeng Zhan
- Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology, International Institute for Earth System Science, Nanjing University, Nanjing 210023, China; Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing 210023, China.
| | - Zihan Liu
- Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology, International Institute for Earth System Science, Nanjing University, Nanjing 210023, China.
| | - E Scott Krayenhoff
- School of Environmental Sciences, University of Guelph, Guelph N1G 2W1, Canada
| | - T C Chakraborty
- Atmospheric Sciences and Global Change Division, Pacific Northwest National Laboratory, Richland 99352, USA
| | - Lei Zhao
- Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, Urbana 61820, USA
| | - Lu Jiang
- Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology, International Institute for Earth System Science, Nanjing University, Nanjing 210023, China
| | - Pan Dong
- Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology, International Institute for Earth System Science, Nanjing University, Nanjing 210023, China
| | - Long Li
- Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology, International Institute for Earth System Science, Nanjing University, Nanjing 210023, China
| | - Fan Huang
- Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology, International Institute for Earth System Science, Nanjing University, Nanjing 210023, China
| | - Shasha Wang
- Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology, International Institute for Earth System Science, Nanjing University, Nanjing 210023, China
| | - Yuyue Xu
- School of Geography and Ocean Science, Nanjing University, Nanjing 210023, China
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Hwang B, Sou HD, Oh JH, Park CR. Cooling effect of urban forests on the urban heat island in Seoul, South Korea. PLoS One 2023; 18:e0288774. [PMID: 37478081 PMCID: PMC10361520 DOI: 10.1371/journal.pone.0288774] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2022] [Accepted: 07/02/2023] [Indexed: 07/23/2023] Open
Abstract
Air pollution and climate change amplify the urban heat island (UHI) effect, which has an adverse effect on human health. Urban forests (UFs) are important to reduce the UHI effect; however, the quantitative effect of UFs on UHI, relative to time and space, has not yet been investigated. In this study, we aimed to quantitatively measure the actual thermal environment in UFs. To this end, temperature and humidity loggers were installed in 17 UFs in Seoul for a year and analyzed according to vegetation characteristics and accessibility. The urban forests and park showed consistent temperature reduction, whereas the lawn showed higher temperature reduction effects during autumn-winter. The traffic island showed lower annual temperature reduction effect than other UFs. From spring to autumn, mixed and broadleaved forests showed better temperature reduction effect than coniferous forests. The temperature in UFs decreased by approximately 1.9°C over ~3 km from the traffic island near the city to the forest. This study revealed the difference in the cooling effect according to the type and location of UF and the vegetation structure. The functional characteristics of plants and the UF that reflects them can help reduce the negative impact of climate warming and UHI on human health.
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Affiliation(s)
- ByungMook Hwang
- Urban Forests Division, National Institute of Forest Science, Seoul, Korea
- Department of Forest Sciences, Kookmin University, Seoul, Korea
| | - Hong-Duck Sou
- Urban Forests Division, National Institute of Forest Science, Seoul, Korea
| | - Jeong-Hak Oh
- Urban Forests Division, National Institute of Forest Science, Seoul, Korea
| | - Chan-Ryul Park
- Urban Forests Division, National Institute of Forest Science, Seoul, Korea
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Kirschner V, Macků K, Moravec D, Maňas J. Measuring the relationships between various urban green spaces and local climate zones. Sci Rep 2023; 13:9799. [PMID: 37328548 PMCID: PMC10275979 DOI: 10.1038/s41598-023-36850-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2023] [Accepted: 06/11/2023] [Indexed: 06/18/2023] Open
Abstract
Urban green spaces (UGS) improve living conditions in cities by mitigating the Urban Heat Island effect. While the cooling effect of UGS seems unequivocal, the relationship between the types of UGS and types of residential areas has not yet been well explored. In this study, we systematically analysed the cooling effect of 71 UGS in Prague, a central European city, on residential areas within 400 m of the UGS. The UGS are classified according to their spatial characteristics (size, shape, and tree density), and the residential areas according to three Local Climate Zones (LCZ 2, 5, 6) typical for European cities. The cooling effect is evaluated using a regression model of the Land Surface Temperature (LST) in residential zones according to the LCZ type and distance from the various UGS. The results show that compact UGS of 10-25 ha with dense trees have the most pronounced cooling effect. This type of UGS was associated with a mean decrease in LST within 400 m of 2.3 °C compared to the least effective UGS type (long with sparse trees) across LCZs. The results of the presented study can be applied in urban planning and urban design to improve microclimates in cities.
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Affiliation(s)
- Vlaďka Kirschner
- Department of Landscape and Urban Planning, Faculty of Environmental Sciences, Czech University of Life Sciences Prague, 16500, Prague, Czech Republic.
| | - Karel Macků
- Department of Geoinformatics, Palacký University in Olomouc, Olomouc, Czech Republic
| | - David Moravec
- Department of Spatial Sciences, Faculty of Environmental Sciences, Czech University of Life Sciences Prague, 16500, Prague, Czech Republic
| | - Jan Maňas
- Department of Landscape and Urban Planning, Faculty of Environmental Sciences, Czech University of Life Sciences Prague, 16500, Prague, Czech Republic
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Zheng J, Sun N, Yan J, Liu C, Yin S. Decoupling between carbon source and sink induced by responses of daily stem growth to water availability in subtropical urban forests. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 877:162802. [PMID: 36924954 DOI: 10.1016/j.scitotenv.2023.162802] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2022] [Revised: 02/21/2023] [Accepted: 03/07/2023] [Indexed: 05/06/2023]
Abstract
Urban forests are anticipated to offer sustainable ecosystem services, necessitating a comprehensive understanding of the ways in which trees respond to environmental changes. This study monitored stem radius fluctuations in Cinnamomum camphora and Taxodium distichum var. imbricatum trees using high-resolution dendrometers at two sites, respectively. Gross primary production (GPP) was measured using eddy-covariance techniques and aggregated to daily sums. Hourly and daily stem radius fluctuations were estimated across both species, and the responses of stems to radiation (Rg), air temperature (Tair), vapor pressure deficit (VPD), and soil humidity (SoilH) were quantified using Bayesian linear models. The diel growth patterns of the monitored trees showed similar characteristics at the species level. Results revealed that trees growth occurred primarily at night, with the lowest hourly contribution to total growth and probability for growth occurring in the afternoon. Furthermore, the Bayesian models indicated that VPD was the most important driver of daily growth and growth probability. After considering the potential constraints imposed by VPD, a modified Gompertz equation showed good performance, with R2 ranging from 0.94 to 0.99 for the relationship between accumulative growth and time. Bayes-based model-independent data assimilation using advanced Markov chain Monte Carlo (MCMC) algorithms provided deeper insights into nonlinear model parameterization. Finally, the quantified relationship between GPP and stem daily growth revealed that the decoupling between carbon source and sink increased with VPD. These findings provided direct empirical evidence for VPD as a key driver of daily growth patterns and raise questions about carbon neutrality accounting under future climate change given the uncertainties induced by increased water stress limitations on carbon utilization.
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Affiliation(s)
- Ji Zheng
- School of Agriculture and Biology, Shanghai Jiao Tong University, 800 Dongchuan Rd., Shanghai 200240, China
| | - Ningxiao Sun
- School of Agriculture and Biology, Shanghai Jiao Tong University, 800 Dongchuan Rd., Shanghai 200240, China; Shanghai Urban Forest Ecosystem Research Station, National Forestry and Grassland Administration, Shanghai 200240, China; Shanghai Yangtze River Delta Eco-Environmental Change and Management Observation and Research Station, Ministry of Science and Technology, Ministry of Education, Shanghai 200240, China
| | - Jingli Yan
- School of Agriculture and Biology, Shanghai Jiao Tong University, 800 Dongchuan Rd., Shanghai 200240, China; Shanghai Urban Forest Ecosystem Research Station, National Forestry and Grassland Administration, Shanghai 200240, China; Shanghai Yangtze River Delta Eco-Environmental Change and Management Observation and Research Station, Ministry of Science and Technology, Ministry of Education, Shanghai 200240, China
| | - Chunjiang Liu
- School of Agriculture and Biology, Shanghai Jiao Tong University, 800 Dongchuan Rd., Shanghai 200240, China; Shanghai Urban Forest Ecosystem Research Station, National Forestry and Grassland Administration, Shanghai 200240, China; Shanghai Yangtze River Delta Eco-Environmental Change and Management Observation and Research Station, Ministry of Science and Technology, Ministry of Education, Shanghai 200240, China
| | - Shan Yin
- School of Agriculture and Biology, Shanghai Jiao Tong University, 800 Dongchuan Rd., Shanghai 200240, China; Shanghai Urban Forest Ecosystem Research Station, National Forestry and Grassland Administration, Shanghai 200240, China; Shanghai Yangtze River Delta Eco-Environmental Change and Management Observation and Research Station, Ministry of Science and Technology, Ministry of Education, Shanghai 200240, China; Key Laboratory for Urban Agriculture, Ministry of Agriculture and Rural Affairs, Shanghai 200240, China.
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Teyton A, Sun Y, Molitor J, Chen JC, Sacks D, Avila C, Chiu V, Slezak J, Getahun D, Wu J, Benmarhnia T. Examining the Relationship Between Extreme Temperature, Microclimate Indicators, and Gestational Diabetes Mellitus in Pregnant Women Living in Southern California. Environ Epidemiol 2023; 7:e252. [PMID: 37304340 PMCID: PMC10256373 DOI: 10.1097/ee9.0000000000000252] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2022] [Accepted: 04/26/2023] [Indexed: 06/13/2023] Open
Abstract
Few studies have assessed extreme temperatures' impact on gestational diabetes mellitus (GDM). We examined the relation between GDM risk with weekly exposure to extreme high and low temperatures during the first 24 weeks of gestation and assessed potential effect modification by microclimate indicators. Methods We utilized 2008-2018 data for pregnant women from Kaiser Permanente Southern California electronic health records. GDM screening occurred between 24 and 28 gestational weeks for most women using the Carpenter-Coustan criteria or the International Association of Diabetes and Pregnancy Study Groups criteria. Daily maximum, minimum, and mean temperature data were linked to participants' residential address. We utilized distributed lag models, which assessed the lag from the first to the corresponding week, with logistic regression models to examine the exposure-lag-response associations between the 12 weekly extreme temperature exposures and GDM risk. We used the relative risk due to interaction (RERI) to estimate the additive modification of microclimate indicators on the relation between extreme temperature and GDM risk. Results GDM risks increased with extreme low temperature during gestational weeks 20--24 and with extreme high temperature at weeks 11-16. Microclimate indicators modified the influence of extreme temperatures on GDM risk. For example, there were positive RERIs for high-temperature extremes and less greenness, and a negative RERI for low-temperature extremes and increased impervious surface percentage. Discussion Susceptibility windows to extreme temperatures during pregnancy were observed. Modifiable microclimate indicators were identified that may attenuate temperature exposures during these windows, which could in turn reduce the health burden from GDM.
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Affiliation(s)
- Anais Teyton
- Herbert Wertheim School of Public Health and Human Longevity Science, University of California San Diego, La Jolla, California
- School of Public Health, San Diego State University, La Jolla, California
| | - Yi Sun
- Department of Environmental and Occupational Health, Program in Public Health, University of California, Irvine, California
| | - John Molitor
- College of Public Health and Human Sciences, Oregon State University, Corvallis, Oregon
| | - Jiu-Chiuan Chen
- Departments of Population & Public Health Sciences and Neurology, University of Southern California, Los Angeles, California
| | - David Sacks
- Department of Research & Evaluation, Kaiser Permanente Southern California, Pasadena, California
- Department of Obstetrics and Gynecology, University of Southern California, Keck School of Medicine, Los Angeles, California
| | - Chantal Avila
- Department of Research & Evaluation, Kaiser Permanente Southern California, Pasadena, California
| | - Vicki Chiu
- Department of Research & Evaluation, Kaiser Permanente Southern California, Pasadena, California
| | - Jeff Slezak
- Department of Research & Evaluation, Kaiser Permanente Southern California, Pasadena, California
| | - Darios Getahun
- Department of Research & Evaluation, Kaiser Permanente Southern California, Pasadena, California
- Department of Health Systems Science, Kaiser Permanente Bernard J. Tyson School of Medicine, Pasadena, California
| | - Jun Wu
- Department of Environmental and Occupational Health, Program in Public Health, University of California, Irvine, California
| | - Tarik Benmarhnia
- Scripps Institution of Oceanography, University of California San Diego, La Jolla, California
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Liu J, Zhang S, Yin L, Li B, Zhang B. Exploring the relationship between seasonal variations of land surface temperature and urban morphological factors in complex urban areas. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:59861-59876. [PMID: 37012569 DOI: 10.1007/s11356-023-26781-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2022] [Accepted: 03/29/2023] [Indexed: 05/10/2023]
Abstract
The urban heat island effect is an increasingly serious problem in urban areas. Previous studies suggest that spatial variation in the urban land surface temperature (LST) is determined by interactions among urban morphological factors, but few studies have explored the main factors that affect the LST in different seasons in complex urban areas, especially at a fine scale. By considering the central Chinese city of Jinan as an example, we selected 19 parameters related to the architectural morphological factors, ecological basis factors, and humanistic factors and explored their effects on the LST in different seasons. A correlation model was used to identify the key factors and to analyze the main impact thresholds in different seasons. In the four seasons, the 19 factors all had significant correlations with LST. In particular, architectural morphological factors comprising the average building height and high building ratio had significant negative correlations with the LST in the four seasons. The architectural morphological factors comprising the floor area ratio, spatial concentration degree, building volume density, and urban surface pattern index comprising the mean nearest neighbor distance to green land, as well as humanistic factors comprising the point of interest density, nighttime light intensity, and human activity intensity of land surface had significant positive correlations with LST in the summer and autumn. Ecological basis factors made the main contributions to the LST in the spring, summer, and winter, whereas humanistic factors contributed the most in the autumn. The contributions of architectural morphological factors were relatively low in the four seasons. The dominant factors differed in each season but their thresholds had similar characteristics. The results obtained in this study deepen our understanding of the relationships between urban morphology and the urban heat island effect, and provide practical suggestions for improving the urban thermal environment through reasonable building planning and management.
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Affiliation(s)
- Jiachen Liu
- College of Geography and Environment, Shandong Normal University, Jinan, 250358, China
| | - Shumin Zhang
- Institute of Regional Economy, Shandong University of Finance and Economics, Jinan, 250014, China
| | - Le Yin
- College of Geography and Environment, Shandong Normal University, Jinan, 250358, China
| | - Bin Li
- College of Geography and Environment, Shandong Normal University, Jinan, 250358, China
| | - Baolei Zhang
- College of Geography and Environment, Shandong Normal University, Jinan, 250358, China.
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Alonzo M, Baker ME, Caplan JS, Williams A, Elmore AJ. Canopy composition drives variability in urban growing season length more than the heat island effect. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 884:163818. [PMID: 37121316 DOI: 10.1016/j.scitotenv.2023.163818] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2023] [Revised: 04/24/2023] [Accepted: 04/25/2023] [Indexed: 05/06/2023]
Abstract
The elevated heat of urban areas compared to their surroundings makes humid temperate cities a useful preview of future climate effects on natural forest phenology. The utility of this proxy rests on the expectation that trees in urban areas alter their phenology in response to warmer site conditions in spring and fall. However, it is possible that apparent lengthening of the growing season is instead governed by human-driven tree species selection and plant functional type (PFT; trees, shrubs, turfgrass) heterogeneity typical of managed landscapes. Without the use of highly spatially and temporally resolved remote sensing data, the roles of tree taxonomy and local site characteristics (e.g., impervious cover) in controlling phenology remain confounded. To understand the drivers of earlier start of season (SOS) and later end of season (EOS) among urban trees, we estimated individual tree phenology using >130 high-resolution satellite images per year (2018-2020) for ~10,000 species-labeled trees in Washington, DC. We found that species identity alone accounted for 4× more variability in the timing of SOS and EOS compared with a tree's planting location characteristics. Additionally, the urban mix of PFTs may be more responsible for apparent advances in SOS (by between 1.8 ± 1.3 and 3.5 ± 1.3 days) than heat per se. The results of this study caution against associating longer growing seasons in cities-observed in moderate to coarse resolution remote sensing imagery-to within-species phenological plasticity and demonstrate the power of high-resolution satellite data for tracking tree phenology in biodiverse environments.
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Affiliation(s)
- Michael Alonzo
- Department of Environmental Science, American University, Washington, DC 20016, USA.
| | - Matthew E Baker
- Department of Geography & Environmental Systems, University of Maryland, Baltimore County, Baltimore, MD 21250, USA
| | - Joshua S Caplan
- Department of Architecture and Environmental Design, Temple University, Ambler, PA 19002, USA
| | - Avery Williams
- Department of Environmental Science, American University, Washington, DC 20016, USA
| | - Andrew J Elmore
- Appalachian Laboratory, University of Maryland Center for Environmental Science, Frostburg, MD 21532, USA
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Yin Y, He L, Wennberg PO, Frankenberg C. Unequal exposure to heatwaves in Los Angeles: Impact of uneven green spaces. SCIENCE ADVANCES 2023; 9:eade8501. [PMID: 37115921 PMCID: PMC10146884 DOI: 10.1126/sciadv.ade8501] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Cities worldwide are experiencing record-breaking summer temperatures. Urban environments exacerbate extreme heat, resulting in not only the urban heat island but also intracity variations in heat exposure. Understanding these disparities is crucial to support equitable climate mitigation and adaptation efforts. We found persistent negative correlations between daytime land surface temperature (LST) and median household income across the Los Angeles metropolitan area based on Ecosystem Spaceborne Thermal Radiometer Experiment on Space Station observations from 2018 to 2021. Lower evapotranspiration resulting from the unequal distribution of vegetation cover is a major factor leading to higher LST in low-income neighborhoods. Disparities worsen with higher regional mean surface temperature, with a $10,000 decrease in income leading to ~0.2°C LST increase at 20°C and up to ~0.7°C at 45°C. With more frequent and intense heat waves projected in the future, equitable mitigation measures, such as increasing surface albedo and tree cover in low-income neighborhoods, are necessary to address these disparities.
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Affiliation(s)
- Yi Yin
- Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, USA
- Corresponding author.
| | - Liyin He
- Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, USA
| | - Paul O. Wennberg
- Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, USA
- Division of Engineering and Applied Science, California Institute of Technology, Pasadena, CA, USA
| | - Christian Frankenberg
- Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, USA
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
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Deshpande P, Sharma R, Lehikoinen A, Thorogood R. Native fauna interact differently with native and alien trees in a tropical megacity. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 868:161683. [PMID: 36690109 DOI: 10.1016/j.scitotenv.2023.161683] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Revised: 01/10/2023] [Accepted: 01/14/2023] [Indexed: 06/17/2023]
Abstract
The negative effects of invasive alien plant species on natural ecosystems are well known. However, in rapidly growing cities, alien plants can provide native fauna with resources otherwise lost due to the biotic homogenization, which is common to urban ecosystems. Interactions of native fauna with alien flora have thus far focused largely on invertebrate pollinators in temperate cities in the northern hemisphere. Cities in tropical areas, however, are larger and are growing more rapidly, and host a variety of vertebrate pollinators. Understanding how birds and mammals interact with native and alien flora in these megacities could improve management of urban ecosystems in highly biodiverse regions while limiting invasion potential. Therefore, here we investigate whether native diurnal birds and mammals interact differently with native versus alien trees in Bengaluru, India where historical planting has led to an abundance of alien tree species. We find that tree origin alone was not an important predictor for bird species richness and abundance, but taller native trees with large floral display sizes were more species rich than alien trees of similar floral displays. As expected from their shared evolutionary history, nectarivorous birds fed from native trees more often in a manner that could facilitate pollination, but engaged in nectar theft more often with alien trees. Squirrels (the mammal observed most frequently to interact with flowers) were more likely, however, to depredate flowers of native trees. Our results suggest alien trees can be an important resource for fauna in expanding urban areas, and that nectar theft by birds could reduce the seed set of alien trees.
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Affiliation(s)
- Purabi Deshpande
- HiLIFE Helsinki Institute of Life Sciences, University of Helsinki, Helsinki FI-00011, Finland; Research Programme in Organismal & Evolutionary Biology, Faculty of Biological and Environmental Sciences, University of Helsinki, Helsinki FI-00011, Finland; The Helsinki Lab of Ornithology, Finnish Museum of Natural History, University of Helsinki, 9 P.O. Box 17, Helsinki FI-00014, Finland.
| | - Rohan Sharma
- Ashoka Trust For Research In Ecology And The Environment, PO, Royal Enclave, Srirampura, Jakkur, Bengaluru, Karnataka 560064, India
| | - Aleksi Lehikoinen
- The Helsinki Lab of Ornithology, Finnish Museum of Natural History, University of Helsinki, 9 P.O. Box 17, Helsinki FI-00014, Finland
| | - Rose Thorogood
- HiLIFE Helsinki Institute of Life Sciences, University of Helsinki, Helsinki FI-00011, Finland; Research Programme in Organismal & Evolutionary Biology, Faculty of Biological and Environmental Sciences, University of Helsinki, Helsinki FI-00011, Finland
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Ponti S, Guglielmin M. How can the floor area types of a university campus mitigate the increase of urban air temperature? LANDSCAPE AND ECOLOGICAL ENGINEERING 2023. [DOI: 10.1007/s11355-023-00553-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/08/2023]
Abstract
AbstractThe urban heat island (UHI) under the current climate change scenario could have a major impact on the lives of urban residents. The presence of green areas undoubtedly mitigates the UHI, and modifies some selected anthropized surfaces with particular characteristics (e.g., albedo). Here, we use a university campus as a good template of the urban context to analyze the mitigation effect of different surface types on the air temperature warming. This study provides some of the best practices for the future management of land surface types in urban areas. Through the development of a simple air temperature mitigation index (ATMI) that uses the temperature, water content (WC), and albedo of the investigated surface types, we find the green and anthropized surfaces according to their areal distribution and mitigation effects. The findings address the importance of poorly managed green areas (few annual mowings) and anthropized materials that permit a good balance between water retention capacity and high albedo. In the case of impervious surfaces, priority should be given to light-colored materials with reduced pavement units (blocks or slabs) to reduce the UHI.
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Wang J, Zhou W, Zheng Z, Jiao M, Qian Y. Interactions among spatial configuration aspects of urban tree canopy significantly affect its cooling effects. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 864:160929. [PMID: 36563758 DOI: 10.1016/j.scitotenv.2022.160929] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Revised: 12/01/2022] [Accepted: 12/10/2022] [Indexed: 06/17/2023]
Abstract
Increasing urban tree canopy (UTC) has been widely recognized as an effective means for urban heat mitigation and adaptation. While numerous studies have shown that both percent cover of UTC and its spatial configuration can significantly affect urban temperature, the pathways governing these relationships are largely unexplored. Here we present a cross-city comparison aiming to fill this gap by explicitly quantifying the pathways on which percent cover of UTC and its spatial configuration affect land surface temperature (LST) using structural equation modeling (SEM), based on UTC mapped from high resolution imagery and LST derived from Landsat thermal bands. We found: 1) Although both the direct and indirect pathways significantly affected LST regardless of scales and cities, the direct pathway played a more important role in affecting LST in Baltimore, Beijing, and Shenzhen. In contrast, an opposite result was found in Sacramento, likely due to the effects of buildings and their interactions with UTC. 2) Similarly, the direct pathway of mean patch size (MPS) and mean shape index (MSI) played a more important role in affecting LST than their indirect effects via altering edge density (ED). Our results highlighted the necessity for discomposing the effects of different spatial configuration variables on LST. Understanding the pathways through which UTC affects LST can provide insights into urban heat mitigation and adaptation.
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Affiliation(s)
- Jia Wang
- State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, No. 18 Shuangqing Road, Beijing 100085, China
| | - Weiqi Zhou
- State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, No. 18 Shuangqing Road, Beijing 100085, China; University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing 100049, China; Beijing Urban Ecosystem Research Station, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, No. 18 Shuangqing Road, Beijing 100085, China; Beijing JingJinJi Urban Megaregion National Observation and Research Station for Eco-Environmental Change, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, No. 18 Shuangqing Road, Beijing 100085, China; Xiongan Institute of Innovation, Xiongan New Area, 071000, China.
| | - Zhong Zheng
- State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, No. 18 Shuangqing Road, Beijing 100085, China
| | - Min Jiao
- State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, No. 18 Shuangqing Road, Beijing 100085, China
| | - Yuguo Qian
- State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, No. 18 Shuangqing Road, Beijing 100085, China
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Iungman T, Cirach M, Marando F, Pereira Barboza E, Khomenko S, Masselot P, Quijal-Zamorano M, Mueller N, Gasparrini A, Urquiza J, Heris M, Thondoo M, Nieuwenhuijsen M. Cooling cities through urban green infrastructure: a health impact assessment of European cities. Lancet 2023; 401:577-589. [PMID: 36736334 DOI: 10.1016/s0140-6736(22)02585-5] [Citation(s) in RCA: 48] [Impact Index Per Article: 48.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Revised: 10/14/2022] [Accepted: 12/07/2022] [Indexed: 02/03/2023]
Abstract
BACKGROUND High ambient temperatures are associated with many health effects, including premature mortality. The combination of global warming due to climate change and the expansion of the global built environment mean that the intensification of urban heat islands (UHIs) is expected, accompanied by adverse effects on population health. Urban green infrastructure can reduce local temperatures. We aimed to estimate the mortality burden that could be attributed to UHIs and the mortality burden that would be prevented by increasing urban tree coverage in 93 European cities. METHODS We did a quantitative health impact assessment for summer (June 1-Aug 31), 2015, of the effect of UHIs on all-cause mortality for adults aged 20 years or older in 93 European cities. We also estimated the temperature reductions that would result from increasing tree coverage to 30% for each city and estimated the number of deaths that could be potentially prevented as a result. We did all analyses at a high-resolution grid-cell level (250 × 250 m). We propagated uncertainties in input analyses by using Monte Carlo simulations to obtain point estimates and 95% CIs. We also did sensitivity analyses to test the robustness of our estimates. FINDINGS The population-weighted mean city temperature increase due to UHI effects was 1·5°C (SD 0·5; range 0·5-3·0). Overall, 6700 (95% CI 5254-8162) premature deaths could be attributable to the effects of UHIs (corresponding to around 4·33% [95% CI 3·37-5·28] of all summer deaths). We estimated that increasing tree coverage to 30% would cool cities by a mean of 0·4°C (SD 0·2; range 0·0-1·3). We also estimated that 2644 (95% CI 2444-2824) premature deaths could be prevented by increasing city tree coverage to 30%, corresponding to 1·84% (1·69-1·97) of all summer deaths. INTERPRETATION Our results showed the deleterious effects of UHIs on mortality and highlighted the health benefits of increasing tree coverage to cool urban environments, which would also result in more sustainable and climate-resilient cities. FUNDING GoGreenRoutes, Spanish Ministry of Science and Innovation, Institute for Global Health, UK Medical Research Council, European Union's Horizon 2020 Project Exhaustion.
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Affiliation(s)
- Tamara Iungman
- Institute for Global Health, Barcelona, Spain; Department of Experimental and Health Sciences, Universitat Pompeu Fabra, Barcelona, Spain; CIBER Epidemiología y Salud Pública (CIBERESP), Madrid, Spain
| | - Marta Cirach
- Institute for Global Health, Barcelona, Spain; Department of Experimental and Health Sciences, Universitat Pompeu Fabra, Barcelona, Spain; CIBER Epidemiología y Salud Pública (CIBERESP), Madrid, Spain
| | | | - Evelise Pereira Barboza
- Institute for Global Health, Barcelona, Spain; Department of Experimental and Health Sciences, Universitat Pompeu Fabra, Barcelona, Spain; CIBER Epidemiología y Salud Pública (CIBERESP), Madrid, Spain
| | - Sasha Khomenko
- Institute for Global Health, Barcelona, Spain; Department of Experimental and Health Sciences, Universitat Pompeu Fabra, Barcelona, Spain; CIBER Epidemiología y Salud Pública (CIBERESP), Madrid, Spain
| | - Pierre Masselot
- Department of Public Health, Environments and Society, London School of Hygiene & Tropical Medicine, London, UK
| | - Marcos Quijal-Zamorano
- Institute for Global Health, Barcelona, Spain; Department of Experimental and Health Sciences, Universitat Pompeu Fabra, Barcelona, Spain
| | - Natalie Mueller
- Institute for Global Health, Barcelona, Spain; Department of Experimental and Health Sciences, Universitat Pompeu Fabra, Barcelona, Spain; CIBER Epidemiología y Salud Pública (CIBERESP), Madrid, Spain
| | - Antonio Gasparrini
- Department of Public Health, Environments and Society, London School of Hygiene & Tropical Medicine, London, UK; Centre on Climate Change and Planetary Health, London School of Hygiene & Tropical Medicine, London, UK; Centre for Statistical Methodology, London School of Hygiene & Tropical Medicine, London, UK
| | - José Urquiza
- Institute for Global Health, Barcelona, Spain; Department of Experimental and Health Sciences, Universitat Pompeu Fabra, Barcelona, Spain; CIBER Epidemiología y Salud Pública (CIBERESP), Madrid, Spain
| | - Mehdi Heris
- Hunter College, City University of New York, New York, NY, USA
| | - Meelan Thondoo
- Institute for Global Health, Barcelona, Spain; MRC Epidemiology Unit, University of Cambridge School of Clinical Medicine, Cambridge, UK
| | - Mark Nieuwenhuijsen
- Institute for Global Health, Barcelona, Spain; Department of Experimental and Health Sciences, Universitat Pompeu Fabra, Barcelona, Spain; CIBER Epidemiología y Salud Pública (CIBERESP), Madrid, Spain.
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Jensen JK, Ziegler AK, Isaxon C, Jiménez-Gallardo L, Garcia Domínguez S, Nilsson JÅ, Rissler J, Isaksson C. Quantifying the influence of urban biotic and abiotic environmental factors on great tit nestling physiology. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 859:160225. [PMID: 36400300 DOI: 10.1016/j.scitotenv.2022.160225] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2022] [Revised: 10/28/2022] [Accepted: 11/12/2022] [Indexed: 06/16/2023]
Abstract
There is a long history of avian studies investigating the impacts of urbanization. While differences in several life-history traits have been documented, either between urban and rural populations or across generalized urbanization gradients, a detailed understanding of which specific environmental variables cause these phenotypic differences is still lacking. Here, we quantified several local environmental variables coupled to urbanization (air pollution, tree composition, ambient temperature, and artificial light at night [ALAN]) within territories of breeding great tits (Parus major). We linked the environmental variables to physiological measures of the nestlings (circulating fatty acid composition [FA], antioxidant capacity and an oxidative damage marker [malondialdehyde; MDA]), to garner a mechanistic understanding of the impact of urbanization. We found that the antioxidant capacity of nestlings decreased with higher numbers of oak trees and levels of PM2.5 (airborne particulate matter with a diameter < 2.5 μm). Furthermore, the ratio of ω6:ω3 polyunsaturated FAs, important for immune function, was positively correlated with PM2.5 concentration, while being negatively associated with ambient temperature and number of non-native trees in the territory. Body mass and wing length both increased with the number of local oak trees. We also show, through a principal component analysis, that while the environmental variables fall into an urbanization gradient, this gradient is insufficient to explain the observed physiological responses. Therefore, accounting for individual environmental variables in parallel, and thus allowing for interactions between these, is crucial to fully understand the urban ecosystem.
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Affiliation(s)
- Johan Kjellberg Jensen
- Department of Biology, Lund University, Lund, Sweden; Centre for Environmental and Climate Science (CEC), Lund University, Lund, Sweden.
| | | | - Christina Isaxon
- NanoLund, Lund University, Lund, Sweden; Ergonomics and Aerosol Technology, Lund University, Lund, Sweden
| | - Lucía Jiménez-Gallardo
- Department of Biodiversity, Ecology and Evolution, Complutense University of Madrid, Madrid, Spain
| | | | | | - Jenny Rissler
- NanoLund, Lund University, Lund, Sweden; Ergonomics and Aerosol Technology, Lund University, Lund, Sweden; Bioeconomy and Health, RISE Research Institutes of Sweden, Lund, Sweden
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Anderson EC, Locke DH, Pickett STA, LaDeau SL. Just street trees? Street trees increase local biodiversity and biomass in higher income, denser neighborhoods. Ecosphere 2023. [DOI: 10.1002/ecs2.4389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/10/2023] Open
Affiliation(s)
- Elsa C. Anderson
- Cary Institute of Ecosystem Studies Millbrook New York USA
- Northwestern University Evanston Illinois USA
| | - Dexter H. Locke
- USDA Forest Service Northern Research Station Baltimore Maryland USA
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Rahman MA, Pawijit Y, Xu C, Moser-Reischl A, Pretzsch H, Rötzer T, Pauleit S. A comparative analysis of urban forests for storm-water management. Sci Rep 2023; 13:1451. [PMID: 36702865 PMCID: PMC9879978 DOI: 10.1038/s41598-023-28629-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2022] [Accepted: 01/20/2023] [Indexed: 01/27/2023] Open
Abstract
Large-scale urban growth has modified the hydrological cycle of our cities, causing greater and faster runoff. Urban forests (UF), i.e. the stock of trees and shrubs, can substantially reduce runoff; still, how climate, tree functional types influence rainfall partitioning into uptake and runoff is mostly unknown. We analyzed 92 published studies to investigate: interception (I), transpiration (T), soil infiltration (IR) and the subsequent reduction in runoff. Trees showed the best runoff protection compared to other land uses. Within functional types, conifers provided better protection on an annual scale through higher I and T but broadleaved species provided better IR. Regarding tree traits, leaf area index (LAI) showed a positive influence for both I and T. For every unit of LAI increment, additional 5% rainfall partition through T (3%) and I (2%) can be predicted. Overall, runoff was significantly lower under mixed species stands. Increase of conifer stock to 30% in climate zones with significant winter precipitation and to 20% in areas of no dry season can reduce runoff to an additional 4%. The study presented an overview of UF potential to partition rainfall, which might help to select species and land uses in different climate zones for better storm-water management.
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Affiliation(s)
- Mohammad A Rahman
- Strategic Landscape Planning and Management, School of Life Sciences, Weihenstephan, Technische Universität München, Emil-Ramann-Str. 6, 85354, Freising, Germany.
| | - Yanin Pawijit
- Strategic Landscape Planning and Management, School of Life Sciences, Weihenstephan, Technische Universität München, Emil-Ramann-Str. 6, 85354, Freising, Germany
| | - Chao Xu
- Research Center for Eco-Environmental Engineering, Dongguan University of Technology, Daxue Road 1, Dongguan, 523808, China
| | - Astrid Moser-Reischl
- Forest Growth and Yield Science, School of Life Sciences, Weihenstephan, Technische Universität München, Hans-Carl-von-Carlowitz-Platz 2, 85354, Freising, Germany
| | - Hans Pretzsch
- Forest Growth and Yield Science, School of Life Sciences, Weihenstephan, Technische Universität München, Hans-Carl-von-Carlowitz-Platz 2, 85354, Freising, Germany
| | - Thomas Rötzer
- Forest Growth and Yield Science, School of Life Sciences, Weihenstephan, Technische Universität München, Hans-Carl-von-Carlowitz-Platz 2, 85354, Freising, Germany
| | - Stephan Pauleit
- Strategic Landscape Planning and Management, School of Life Sciences, Weihenstephan, Technische Universität München, Emil-Ramann-Str. 6, 85354, Freising, Germany
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Smith IA, Fabian MP, Hutyra LR. Urban green space and albedo impacts on surface temperature across seven United States cities. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 857:159663. [PMID: 36302415 DOI: 10.1016/j.scitotenv.2022.159663] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2022] [Revised: 10/19/2022] [Accepted: 10/19/2022] [Indexed: 06/16/2023]
Abstract
Extreme heat represents a growing threat to public health, especially across the densely populated, developed landscape of cities. Climate adaptation strategies that aim to manage urban microclimates through purposeful design can reduce the heat exposure of urban populations, however, it is unclear how the temperature impacts of urban green space and albedo vary across cities and background climate. This study quantifies the sensitivity of surface temperature to landcover characteristics tied to two widely used climate adaptation strategies, urban greening and albedo manipulation (e.g. white roofs), by combining long-term remote sensing observations of land surface temperature, albedo, and moisture with high-resolution landcover datasets in a spatial regression analysis at the census block scale across seven United States cities. We find tree cover to have an average cooling impact of -0.089 K per % cover, which is approximately four times stronger than the average grass cover cooling impact of -0.021 K per % cover. Variability in the magnitude of grass cover cooling impacts was primarily a function of vegetation moisture content, with the Land Surface Water Index (LSWI) explaining 89 % of the variability in grass cover cooling impacts across cities. Variability in tree cover cooling impacts was primarily a function of sunlight and vegetation moisture content, with solar irradiance and LSWI explaining 97 % of the cooling variability across cities. Albedo cooling impacts were consistent across cities with an average cooling impact of -0.187 K per increase of 0.01. While these interventions are broadly effective across cities, there are critical regional trade-offs between vegetation cooling efficiency, irrigation requirements, and the temporal duration and evolution of the cooling benefits. In warm, arid cities, high albedo surfaces offer multifaceted benefits such as cooling and water conservation, whereas temperate, mesic cities likely benefit from a combination of strategies, with greening efforts targeting highly paved neighborhoods.
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Affiliation(s)
- Ian A Smith
- Boston University, Department of Earth & Environment, 685 Commonwealth Ave., Boston, MA 02215, USA.
| | - M Patricia Fabian
- Boston University, Department of Environmental Health, 715 Albany St., Boston, MA 02118, USA
| | - Lucy R Hutyra
- Boston University, Department of Earth & Environment, 685 Commonwealth Ave., Boston, MA 02215, USA
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Considerations on the impact of "source-sink" landscape pattern changes on urban thermal environment and cooling efficiency: a case study of Nanjing, China. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:42296-42310. [PMID: 36648719 DOI: 10.1007/s11356-023-25289-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2022] [Accepted: 01/09/2023] [Indexed: 01/18/2023]
Abstract
The urban heat island effect caused by rapid urbanization has had a great impact on human health and ecological environment. The evolution of landscape patterns often affects regional thermal characteristics at the local scale. How to rationally allocate land cover types from the perspective of urban planning is a huge challenge. This paper takes Nanjing, a typical "stove city" in China, as an example to study the impact of landscape pattern changes on the urban thermal environment. Firstly, based on the "source" landscape "/sink" landscape identified by the "source-sink" landscape index, on this basis, the contributions of the "source-sink" landscape and its effects are calculated, and the temporal and spatial evolution laws are analyzed. Second, we study the cooling effect of different characteristic landscapes. The results show that the change of landscape pattern is closely related to the urban thermal environment, and the expansion of built-up areas is the main reason for the urban thermal environment. With the development of urbanization, the "source-sink" landscape structure in most districts and counties has aggravated the heat island effect, and the ratios of "sink" and "source" landscape contribution ratios with strong levels are concentrated in the suburban areas. The results of cooling efficiency research show that the cooling range of forest land is larger than that of water bodies. At the same time, we found that the cooling efficiency of the sink landscape is the highest when the area of the sink landscape is 0.18-0.9 hm2 and the shape index is between 1 and 4. The research results can provide feasible and practical scientific suggestions for the planning and ecological construction of Nanjing.
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Luo T, Zhang Z, Hong X, Wang Y, Zhang X. Evaluating Spatial Identity Based on Climate Adaptation in Small Cities. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 20:713. [PMID: 36613033 PMCID: PMC9819182 DOI: 10.3390/ijerph20010713] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/14/2022] [Revised: 12/24/2022] [Accepted: 12/27/2022] [Indexed: 06/17/2023]
Abstract
Urban spatial identity is declining in Chinese cities overall due to urbanization, which is attracting increasing attention from the government. Research gaps include systematically comparing urban identities based on causes and manifestations in small cities. We developed a framework for estimating spatial identity from the perspective of climate adaptation, which is based on the relationship between regional climate and spatial form. Five small cities were selected in China: Wu'an, Qingcheng, Jintang, Changxing, and Lianjiang. Our findings suggest that (1) typical indicators include impervious surface rate, green coverage rate, water surface rate, average story number, and total gross floor area, contributing to morphological characteristics influenced by climate drivers; (2) for the hot humid climate zones, the city with the highest level of spatial identity is in Jintang, followed by Lianjiang and Changxing; and for the cold climate zones, the level of spatial identity in Qingcheng was higher than in Wu'an. This can contribute to the understanding and methodology of spatial identity based on climate adaptation in small cities.
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Affiliation(s)
- Tao Luo
- School of Architecture and Urban-Rural Planning, Fuzhou University, Fuzhou 350108, China
| | - Zijing Zhang
- School of Architecture and Urban-Rural Planning, Fuzhou University, Fuzhou 350108, China
| | - Xinchen Hong
- School of Architecture and Urban-Rural Planning, Fuzhou University, Fuzhou 350108, China
| | - Yanyun Wang
- Fujian Geological Remote Sensing and Geographic Information Service Center, Fuzhou 350011, China
| | - Xuewei Zhang
- School of Architecture and Urban-Rural Planning, Fuzhou University, Fuzhou 350108, China
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Jiang B, Yang Y, Chen L, Liu X, Wu X, Chen B, Webster C, Sullivan WC, Larsen L, Wang J, Lu Y. Green spaces, especially nearby forest, may reduce the SARS-CoV-2 infection rate: A nationwide study in the United States. LANDSCAPE AND URBAN PLANNING 2022; 228:104583. [PMID: 36158763 PMCID: PMC9485427 DOI: 10.1016/j.landurbplan.2022.104583] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2022] [Revised: 09/14/2022] [Accepted: 09/15/2022] [Indexed: 05/10/2023]
Abstract
The coronavirus pandemic is an ongoing global crisis that has profoundly harmed public health. Although studies found exposure to green spaces can provide multiple health benefits, the relationship between exposure to green spaces and the SARS-CoV-2 infection rate is unclear. This is a critical knowledge gap for research and practice. In this study, we examined the relationship between total green space, seven types of green space, and a year of SARS-CoV-2 infection data across 3,108 counties in the contiguous United States, after controlling for spatial autocorrelation and multiple types of covariates. First, we examined the association between total green space and SARS-CoV-2 infection rate. Next, we examined the association between different types of green space and SARS-CoV-2 infection rate. Then, we examined forest-infection rate association across five time periods and five urbanicity levels. Lastly, we examined the association between infection rate and population-weighted exposure to forest at varying buffer distances (100 m to 4 km). We found that total green space was negative associated with the SARS-CoV-2 infection rate. Furthermore, two forest variables (forest outside park and forest inside park) had the strongest negative association with the infection rate, while open space variables had mixed associations with the infection rate. Forest outside park was more effective than forest inside park. The optimal buffer distances associated with lowest infection rate are within 1,200 m for forest outside park and within 600 m for forest inside park. Altogether, the findings suggest that green spaces, especially nearby forest, may significantly mitigate risk of SARS-CoV-2 infection.
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Affiliation(s)
- Bin Jiang
- Urban Environments and Human Health Lab, HKUrbanLabs, Faculty of Architecture, The University of Hong Kong, Hong Kong Special Administrative Region
- Division of Landscape Architecture, Department of Architecture, The University of Hong Kong, Hong Kong Special Administrative Region
| | - Yuwen Yang
- Urban Environments and Human Health Lab, HKUrbanLabs, Faculty of Architecture, The University of Hong Kong, Hong Kong Special Administrative Region
- Division of Landscape Architecture, Department of Architecture, The University of Hong Kong, Hong Kong Special Administrative Region
| | - Long Chen
- Department of Architecture and Civil Engineering, College of Engineering, City University of Hong Kong, Hong Kong Special Administrative Region
| | - Xueming Liu
- Urban Environments and Human Health Lab, HKUrbanLabs, Faculty of Architecture, The University of Hong Kong, Hong Kong Special Administrative Region
- Division of Landscape Architecture, Department of Architecture, The University of Hong Kong, Hong Kong Special Administrative Region
| | - Xueying Wu
- Department of Architecture and Civil Engineering, College of Engineering, City University of Hong Kong, Hong Kong Special Administrative Region
| | - Bin Chen
- Future Urbanity & Sustainable Environment (FUSE) Lab, Division of Landscape Architecture, Department of Architecture, Faculty of Architecture, The University of Hong Kong, Hong Kong Special Administrative Region
- Urban Systems Institute, The University of Hong Kong, Hong Kong Special Administrative Region
- HKU Musketeers Foundation Institute of Data Science, The University of Hong Kong, Hong Kong Special Administrative Region
| | - Chris Webster
- HKUrbanLabs, Faculty of Architecture, The University of Hong Kong, Hong Kong Special Administrative Region
| | - William C Sullivan
- Smart, Healthy Communities Initiative, University of Illinois at Urbana-Champaign, USA
- Department of Landscape Architecture, University of Illinois at Urbana-Champaign, USA
| | - Linda Larsen
- Smart Energy Design Assistance Center, University of Illinois at Urbana-Champaign, USA
| | - Jingjing Wang
- Department of Architecture and Civil Engineering, City University of Hong Kong, Hong Kong Special Administrative Region
| | - Yi Lu
- Department of Architecture and Civil Engineering, City University of Hong Kong, Hong Kong Special Administrative Region
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Jay J, Kondo MC, Lyons VH, Gause E, South EC. Neighborhood segregation, tree cover and firearm violence in 6 U.S. cities, 2015-2020. Prev Med 2022; 165:107256. [PMID: 36115422 PMCID: PMC10903784 DOI: 10.1016/j.ypmed.2022.107256] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/16/2022] [Revised: 08/31/2022] [Accepted: 09/07/2022] [Indexed: 11/17/2022]
Abstract
Neighborhood segregation by race and income is a structural determinant of firearm violence. Addressing green space deficits in segregated neighborhoods is a promising prevention strategy. This study assessed the potential for reducing firearm violence disparities by increasing access to tree cover. Units of analysis were census tracts in six U.S. cities (Baltimore, MD; Philadelphia, PA; Richmond, VA; Syracuse, NY; Washington, DC; Wilmington, DE). We measured segregation using the index of concentration at the extremes (ICE) for race-income. We calculated proportion tree cover based on 2013-2014 imagery. Outcomes were 2015-2020 fatal and non-fatal shootings from the Gun Violence Archive. We modeled firearm violence as a function of ICE, tree cover, and covariates representing the social and built environment. Next, we simulated possible effects of "tree equity" programs, i.e., raising tract-level tree cover to a specified baseline level. In our fully-adjusted model, higher privilege on the ICE measure (1 standard deviation, SD) was associated with a 42% reduction in shootings (incidence rate ratio (IRR) = 0.58, 95% CI [0.54 0.62], p < 0.001). A 1-SD increase in tree cover was associated with a 9% reduction (IRR = 0.91, 95% CI [0.86, 0.97], p < 0.01). Simulated achievement of 40% baseline tree cover was associated with reductions in firearm violence, with the largest reductions in highly-deprived neighborhoods. Advancing tree equity would not disrupt the fundamental causes of racial disparities in firearm violence exposure, but may have the potential to help mitigate those disparities.
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Affiliation(s)
- Jonathan Jay
- Department of Community Health Sciences, Boston University School of Public Health, Boston, MA, USA.
| | - Michelle C Kondo
- USDA Forest Service, Northern Research Station, Philadelphia, PA, USA
| | - Vivian H Lyons
- Social Development Research Group, School of Social Work, University of Washington, Seattle, WA, USA
| | - Emma Gause
- Firearm Injury and Policy Research Program, Harborview Injury Prevention and Research Program, University of Washington, Seattle, WA, USA
| | - Eugenia C South
- Urban Health Lab, Department of Emergency Medicine, University of Pennsylvania, Philadelphia, PA, USA
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46
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Tieskens KF, Smith IA, Jimenez RB, Hutyra LR, Fabian MP. Mapping the gaps between cooling benefits of urban greenspace and population heat vulnerability. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 845:157283. [PMID: 35820520 DOI: 10.1016/j.scitotenv.2022.157283] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2022] [Revised: 06/17/2022] [Accepted: 07/06/2022] [Indexed: 06/15/2023]
Abstract
We provide a novel method to assess the heat mitigation impacts of greenspace though studying the mechanisms of ecosystems responsible for benefits and connecting them to heat exposure metrics. We demonstrate how the ecosystem services framework can be integrated into current practices of environmental health research using supply/demand state-of-the-art methods of ecological modeling of urban greenspace. We compared the supply of cooling ecosystem services in Boston measured through an indicator of high resolution evapotranspiration modeling, with the demand for benefits from cooling measured as a heat exposure risk score based on exposure, hazard and population characteristics. The resulting evapotranspiration indicator follows a pattern similar to conventional greenspace indicators based on vegetation abundance, except in warmer areas such as those with higher levels of impervious surface. We identified demand-supply mismatch areas across the city of Boston, some coinciding with affordable housing complexes and long term care facilities. This novel ES-framework provides cross-disciplinary methods to prioritize urban areas where greenspace interventions can have the most impact based on heat-related demand.
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Affiliation(s)
- Koen F Tieskens
- Department of Environmental Health, Boston University School of Public Health, Boston, MA 02118, USA.
| | - Ian A Smith
- Department of Earth and Environment, Boston University, Boston, MA 02215, USA
| | - Raquel B Jimenez
- Department of Environmental Health, Boston University School of Public Health, Boston, MA 02118, USA
| | - Lucy R Hutyra
- Department of Earth and Environment, Boston University, Boston, MA 02215, USA
| | - M Patricia Fabian
- Department of Environmental Health, Boston University School of Public Health, Boston, MA 02118, USA
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47
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Cimino A, McWhirter JE, Papadopoulos A. Made in the shade: A qualitative study of factors impacting shade provision at outdoor public parks. INTERNATIONAL JOURNAL OF ENVIRONMENTAL HEALTH RESEARCH 2022; 32:2562-2574. [PMID: 34496709 DOI: 10.1080/09603123.2021.1977257] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2021] [Accepted: 09/02/2021] [Indexed: 06/13/2023]
Abstract
Shade provides a variety of public health benefits; however, outdoor recreation sites often have limited shade. We conducted semi-structured interviews (n = 13) with shade stakeholders (i.e. individuals with a professional role involving shade design or provision) to gain in-depth understanding of the factors impacting shade provision at public parks. Interview transcripts were analyzed using inductive thematic analysis. Five main themes emerged: (1) attitudes toward shade at parks; (2) designing shade at parks; (3) advantages and disadvantages of natural and built shade; (4) barriers to shade at parks; and, (5) approaches to reduce shade barriers. Shade stakeholders indicated shade is important and necessary and they strive to design shade in park spaces with park user patterns in mind. However, barriers including competing interests, budget, space constraints, and maintenance and operational concerns can limit their ability to do so. Future research should determine strategies to overcome these barriers.
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Affiliation(s)
- Andrea Cimino
- Department of Population Medicine, University of Guelph, Guelph, Canada
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48
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Cheng X, Peng J, Dong J, Liu Y, Wang Y. Non-linear effects of meteorological variables on cooling efficiency of African urban trees. ENVIRONMENT INTERNATIONAL 2022; 169:107489. [PMID: 36087378 DOI: 10.1016/j.envint.2022.107489] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2022] [Revised: 07/26/2022] [Accepted: 08/22/2022] [Indexed: 06/15/2023]
Abstract
Urban tree cover is widely regarded as an environmentally-friendly and effective urban cooling approach. Meteorological variables, including air temperature, wind speed, and humidity, have complex impacts on the cooling efficiency (CE) of urban trees (i.e., the negative ratio of the land surface temperature change to the tree cover percentage change). This means that increasing the urban tree cover to alleviate heat stress is not necessarily suitable for cities with different climates. African cities are confronted with larger heat risks but lack considerations for the effectiveness of urban tree cooling in urban planning. In this study, 40 African major cities with population greater than 500,000 in different climatic regions were selected, and 1459 CEs during each city's corresponding warmest 3 consecutive months were calculated combined with the availability of meteorological data. The generalized additive models revealed the non-linear impacts of air temperature/temperature dew point difference on CE, which were more evident in arid cities. The CE of urban trees actually increased and then decreased along with the increase of air temperature/temperature dew point difference, and the turning point were 34 °C/26 °C, respectively. African cities would have different frequencies of warm days with an air temperature over 34 °C under different Shared Socioeconomic Pathways within the next 30 years. Specially, the cities around Sahel would suffer up to 40-60% days over 34 °C, which meant their urban tree CE would decrease along with air temperature increase. This study highlighted that in African cities, especially those with arid climate, it was unadvisable to only count on increasing tree cover to alleviate urban heat stress in the warming future, which called for other combined cooling strategies.
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Affiliation(s)
- Xueyan Cheng
- Laboratory for Earth Surface Processes, Ministry of Education, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China
| | - Jian Peng
- Laboratory for Earth Surface Processes, Ministry of Education, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China.
| | - Jianquan Dong
- Laboratory for Earth Surface Processes, Ministry of Education, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China
| | - Yanxu Liu
- State Key Laboratory of Earth Surface Processes and Resource Ecology, Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China
| | - Yanglin Wang
- Laboratory for Earth Surface Processes, Ministry of Education, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China
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49
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Yan H, Wu F, Nan X, Han Q, Shao F, Bao Z. Influence of view factors on intra-urban air temperature and thermal comfort variability in a temperate city. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 841:156720. [PMID: 35716739 DOI: 10.1016/j.scitotenv.2022.156720] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2022] [Revised: 05/22/2022] [Accepted: 06/11/2022] [Indexed: 06/15/2023]
Abstract
Urban geometry is known to be one of the major factors in explaining the intra-urban temperature variations. A commonly used indicator to describe the urban geometry is the sky view factor. However, the existing studies have shown that the relationship between SVF and urban temperature is quite contradictory. This suggests that a single SVF cannot accurately quantify the urban geometry. For comparison, we here propose to use view factors, including sky, building and tree view factors (SVF, BVF, and TVF, respectively), to accurately quantify the three-dimensional urban geometry. Based on microclimate measurements conducted in Beijing Olympic Park and its surrounding urban environment in Beijing, China, the impact of view factors on intra-urban air temperature and thermal comfort was evaluated. Measurements were conducted along a selected path during hot summer days with clear skies and light winds by mobile traverses. The obtained results showed that SVF was positively correlated with air temperature during the day but negatively correlated with air temperature at night. BVF mainly played a warming role in both daytime and nighttime. Especially at night, BVF was the main geometric warming factor. TVF had a significant cooling effect during the day but did not have a negative effect at night due to reduced SVF. There was a strong point-to-point correlation between SVF and outdoor thermal comfort in the daytime. The mean differences in Mean Radiant Temperature and Physiologically Equivalent Temperature between shaded and unshaded sites were 12.0 °C and 6.8 °C, respectively, which suggested that providing effective shading is extremely important for improving outdoor daytime thermal comfort.
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Affiliation(s)
- Hai Yan
- College of Landscape Architecture, Zhejiang A & F University, Hangzhou 311300, China.
| | - Fan Wu
- School of Civil Engineering and Architecture, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Xinge Nan
- College of Landscape Architecture, Zhejiang A & F University, Hangzhou 311300, China
| | - Qian Han
- College of Landscape Architecture, Zhejiang A & F University, Hangzhou 311300, China
| | - Feng Shao
- College of Landscape Architecture, Zhejiang A & F University, Hangzhou 311300, China
| | - Zhiyi Bao
- College of Landscape Architecture, Zhejiang A & F University, Hangzhou 311300, China
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50
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A study of physical factors influencing park cooling intensities and their effects in different time of the day. J Therm Biol 2022; 109:103336. [DOI: 10.1016/j.jtherbio.2022.103336] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2022] [Revised: 09/04/2022] [Accepted: 09/13/2022] [Indexed: 11/18/2022]
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