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Zhao W, Zhu Z, Cao S, Li M, Zha J, Pu J, Myneni RB. A global dataset of the fraction of absorbed photosynthetically active radiation for 1982-2022. Sci Data 2024; 11:707. [PMID: 38942755 PMCID: PMC11213951 DOI: 10.1038/s41597-024-03561-0] [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: 03/14/2024] [Accepted: 06/20/2024] [Indexed: 06/30/2024] Open
Abstract
The fraction of absorbed photosynthetically active radiation (FPAR) is an essential biophysical parameter that characterizes the structure and function of terrestrial ecosystems. Despite the extensive utilization of several satellite-derived FPAR products, notable temporal inconsistencies within each product have been underscored. Here, the new generation of the GIMMS FPAR product, GIMMS FPAR4g, was developed using a combination of a machine learning algorithm and a pixel-wise multi-sensor records integration approach. PKU GIMMS NDVI, which eliminates the orbital drift and sensor degradation issues, was used as the data source. Comparisons with ground-based measurements indicate root mean square errors ranging from 0.10 to 0.14 with R-squared ranging from 0.73 to 0.87. More importantly, our product demonstrates remarkable spatiotemporal coherence and continuity, revealing a persistent terrestrial darkening over the past four decades (0.0004 yr-1, p < 0.001). The GIMMS FPAR4g, available for half-month intervals at a spatial resolution of 1/12° from 1982 to 2022, promises to be a valuable asset for in-depth analyses of vegetation structures and functions spanning the last 40 years.
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Affiliation(s)
- Weiqing Zhao
- School of Urban Planning and Design, Shenzhen Graduate School, Peking University, Shenzhen, 518055, China
- Institute of Carbon Neutrality, Peking University, Beijing, 100871, China
- Key Laboratory of Earth Surface System and Human-Earth Relations, Ministry of Natural Resources of China, Shenzhen Graduate School, Peking University, Shenzhen, 518055, China
| | - Zaichun Zhu
- School of Urban Planning and Design, Shenzhen Graduate School, Peking University, Shenzhen, 518055, China.
- Institute of Carbon Neutrality, Peking University, Beijing, 100871, China.
- Key Laboratory of Earth Surface System and Human-Earth Relations, Ministry of Natural Resources of China, Shenzhen Graduate School, Peking University, Shenzhen, 518055, China.
| | - Sen Cao
- School of Urban Planning and Design, Shenzhen Graduate School, Peking University, Shenzhen, 518055, China
- Institute of Carbon Neutrality, Peking University, Beijing, 100871, China
- Key Laboratory of Earth Surface System and Human-Earth Relations, Ministry of Natural Resources of China, Shenzhen Graduate School, Peking University, Shenzhen, 518055, China
| | - Muyi Li
- School of Urban Planning and Design, Shenzhen Graduate School, Peking University, Shenzhen, 518055, China
- Institute of Carbon Neutrality, Peking University, Beijing, 100871, China
- Key Laboratory of Earth Surface System and Human-Earth Relations, Ministry of Natural Resources of China, Shenzhen Graduate School, Peking University, Shenzhen, 518055, China
| | - Junjun Zha
- School of Urban Planning and Design, Shenzhen Graduate School, Peking University, Shenzhen, 518055, China
- Institute of Carbon Neutrality, Peking University, Beijing, 100871, China
- Key Laboratory of Earth Surface System and Human-Earth Relations, Ministry of Natural Resources of China, Shenzhen Graduate School, Peking University, Shenzhen, 518055, China
| | - Jiabin Pu
- Department of Earth and Environment, Boston University, Boston, MA, 02215, USA
| | - Ranga B Myneni
- Department of Earth and Environment, Boston University, Boston, MA, 02215, USA
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Miraglio T, Coops NC, Wallis CIB, Crofts AL, Kalacska M, Vellend M, Serbin SP, Arroyo-Mora JP, Laliberté E. Mapping canopy traits over Québec using airborne and spaceborne imaging spectroscopy. Sci Rep 2023; 13:17179. [PMID: 37821515 PMCID: PMC10567784 DOI: 10.1038/s41598-023-44384-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2022] [Accepted: 10/07/2023] [Indexed: 10/13/2023] Open
Abstract
The advent of new spaceborne imaging spectrometers offers new opportunities for ecologists to map vegetation traits at global scales. However, to date most imaging spectroscopy studies exploiting satellite spectrometers have been constrained to the landscape scale. In this paper we present a new method to map vegetation traits at the landscape scale and upscale trait maps to the continental level, using historical spaceborne imaging spectroscopy (Hyperion) to derive estimates of leaf mass per area, nitrogen, and carbon concentrations of forests in Québec, Canada. We compare estimates for each species with reference field values and obtain good agreement both at the landscape and continental scales, with patterns consistent with the leaf economic spectrum. By exploiting the Hyperion satellite archive to map these traits and successfully upscale the estimates to the continental scale, we demonstrate the great potential of recent and upcoming spaceborne spectrometers to benefit plant biodiversity monitoring and conservation efforts.
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Affiliation(s)
- Thomas Miraglio
- Integrated Remote Sensing Studio, Department of Forest Resources Management, University of British Columbia, 2424 Main Mall, Vancouver, BC, V6T 1Z4, Canada.
| | - Nicholas C Coops
- Integrated Remote Sensing Studio, Department of Forest Resources Management, University of British Columbia, 2424 Main Mall, Vancouver, BC, V6T 1Z4, Canada
| | | | - Anna L Crofts
- Département de Biologie, Université de Sherbrooke, Sherbrooke, QC, Canada
| | - Margaret Kalacska
- Applied Remote Sensing Lab, Department of Geography, McGill University, Montréal, QC, H3A 0G4, Canada
| | - Mark Vellend
- Département de Biologie, Université de Sherbrooke, Sherbrooke, QC, Canada
| | - Shawn P Serbin
- Environmental and Climate Sciences Department, Brookhaven National Laboratory, Upton, NY, 11973, USA
| | - Juan Pablo Arroyo-Mora
- Flight Research Laboratory, National Research Council of Canada, Ottawa, ON, K1A 0R6, Canada
| | - Etienne Laliberté
- Département de Sciences Biologiques, Institut de Recherche en Biologie Végétale, Université de Montréal, Montréal, QC, H3A 0G4, Canada
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