1
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Sha L, Dang H, Wang Y, Wassenburg JA, Baker JL, Li H, Sinha A, Ait Brahim Y, Wu N, Lu Z, Yang C, Dong X, Lu J, Zhang H, Mahata S, Cai Y, Jian Z, Cheng H. Triple oxygen isotope reveals insolation-forced tropical moisture cycles. SCIENCE ADVANCES 2024; 10:eadp7855. [PMID: 39259794 PMCID: PMC11389795 DOI: 10.1126/sciadv.adp7855] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2024] [Accepted: 08/06/2024] [Indexed: 09/13/2024]
Abstract
Tropical oceans are the main global water vapor and latent heat sources, but their responses to radiative forcing remain unclear. Here, we investigate oceanic moisture dynamics of the western tropical Pacific (WTP) over the past 210,000 years through an approach of planktonic foraminiferal triple oxygen isotope (Δ'17O). The Δ'17O record is dominated by the precession cycles (~23,000 years), with lower values reflecting higher humidity in concert with higher Northern Hemisphere summer insolation. Our empirical and modeling results, combined with other geological archives, suggest that the enhanced moisture convergence over the WTP largely intensifies changes in the meridional and zonal hydrological cycles, affecting rainfall patterns in East Asia and northern South America. We propose that the insolation-driven WTP moisture dynamics play a pivotal role in regulating tropical hydroclimate.
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Affiliation(s)
- Lijuan Sha
- Institute of Global Environmental Change, Xi'an Jiaotong University, Xi'an, China
| | - Haowen Dang
- State Key Laboratory of Marine Geology, Tongji University, Shanghai, China
| | - Yue Wang
- State Key Laboratory of Marine Geology, Tongji University, Shanghai, China
| | - Jasper A Wassenburg
- Center for Climate Physics, Institute for Basic Science, Busan, Republic of Korea
- Pusan National University, Busan, Republic of Korea
| | - Jonathan L Baker
- Institute of Global Environmental Change, Xi'an Jiaotong University, Xi'an, China
- Institute of Geology, University of Innsbruck, Innrain 52, Innsbruck 6020, Austria
| | - Hanying Li
- Institute of Global Environmental Change, Xi'an Jiaotong University, Xi'an, China
| | - Ashish Sinha
- Department of Earth Sciences, California State University Dominguez Hills, Carson, CA, USA
| | - Yassine Ait Brahim
- International Water Research Institute, Mohammed VI Polytechnic University, Ben Guerir, Morocco
| | - Nanping Wu
- Institute of Deep-Sea Science and Engineering, Chinese Academy of Sciences, Hainan, China
- School of Earth, Atmosphere and Environment, Monash University, Clayton, VIC 3800, Australia
| | - Zhengyao Lu
- Department of Physical Geography and Ecosystem Science, Lund University, Lund, Sweden
| | - Ce Yang
- State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an, China
| | - Xiyu Dong
- Institute of Global Environmental Change, Xi'an Jiaotong University, Xi'an, China
| | - Jiayu Lu
- Jiangsu Coastal Development Research Institute, Yancheng Teachers University, Yancheng, China
| | - Haiwei Zhang
- Institute of Global Environmental Change, Xi'an Jiaotong University, Xi'an, China
| | - Sasadhar Mahata
- Institute of Global Environmental Change, Xi'an Jiaotong University, Xi'an, China
| | - Yanjun Cai
- Institute of Global Environmental Change, Xi'an Jiaotong University, Xi'an, China
| | - Zhimin Jian
- State Key Laboratory of Marine Geology, Tongji University, Shanghai, China
| | - Hai Cheng
- Institute of Global Environmental Change, Xi'an Jiaotong University, Xi'an, China
- State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, China
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2
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Li X, Zhou Y, Han Z, Yuan X, Yi S, Zeng Y, Qin L, Lu M, Lu H. Loess deposits in the low latitudes of East Asia reveal the ~20-kyr precipitation cycle. Nat Commun 2024; 15:1023. [PMID: 38310099 PMCID: PMC10838313 DOI: 10.1038/s41467-024-45379-9] [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: 12/12/2022] [Accepted: 01/18/2024] [Indexed: 02/05/2024] Open
Abstract
The cycle of precipitation change is key to understanding the driving mechanism of the East Asian summer monsoon (EASM). However, the dominant cycles of EASM precipitation revealed by different proxy indicators are inconsistent, leading to the "Chinese 100 kyr problem". In this study, we examine a high-resolution, approximately 350,000-year record from a low-latitude loess profile in China. Our analyses show that variations in the ratio of dithionite-citrate-bicarbonate extractable iron to total iron are dominated by the ~20-kyr cycle, reflecting changes in precipitation. In contrast, magnetic susceptibility varies with the ~100-kyr cycle and may be mainly controlled by temperature-induced redox processes or precipitation-induced signal smoothing. Our results suggest that changes in the EASM, as indicated by precipitation in this region, are mainly forced by precession-dominated insolation variations, and that precipitation and temperature may have varied with different cycles over the past ~350,000 years.
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Affiliation(s)
- Xusheng Li
- School of Geography and Ocean Science, Nanjing University, Nanjing, 210023, China
| | - Yuwen Zhou
- School of Geography and Ocean Science, Nanjing University, Nanjing, 210023, China
| | - Zhiyong Han
- School of Geography and Ocean Science, Nanjing University, Nanjing, 210023, China.
| | - Xiaokang Yuan
- School of Geography and Ocean Science, Nanjing University, Nanjing, 210023, China
| | - Shuangwen Yi
- School of Geography and Ocean Science, Nanjing University, Nanjing, 210023, China
| | - Yuqiang Zeng
- School of Geography and Ocean Science, Nanjing University, Nanjing, 210023, China
| | - Lisha Qin
- School of Geography and Ocean Science, Nanjing University, Nanjing, 210023, China
| | - Ming Lu
- School of Geography and Ocean Science, Nanjing University, Nanjing, 210023, China
| | - Huayu Lu
- School of Geography and Ocean Science, Nanjing University, Nanjing, 210023, China
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3
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Ao H, Ruan J, Martinón-Torres M, Krapp M, Liebrand D, Dekkers MJ, Caley T, Jonell TN, Zhu Z, Huang C, Li X, Zhang Z, Sun Q, Yang P, Jiang J, Li X, Xie X, Song Y, Qiang X, Zhang P, An Z. Concurrent Asian monsoon strengthening and early modern human dispersal to East Asia during the last interglacial. Proc Natl Acad Sci U S A 2024; 121:e2308994121. [PMID: 38190536 PMCID: PMC10801887 DOI: 10.1073/pnas.2308994121] [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: 06/05/2023] [Accepted: 11/19/2023] [Indexed: 01/10/2024] Open
Abstract
The relationship between initial Homo sapiens dispersal from Africa to East Asia and the orbitally paced evolution of the Asian summer monsoon (ASM)-currently the largest monsoon system-remains underexplored due to lack of coordinated synthesis of both Asian paleoanthropological and paleoclimatic data. Here, we investigate orbital-scale ASM dynamics during the last 280 thousand years (kyr) and their likely influences on early H. sapiens dispersal to East Asia, through a unique integration of i) new centennial-resolution ASM records from the Chinese Loess Plateau, ii) model-based East Asian hydroclimatic reconstructions, iii) paleoanthropological data compilations, and iv) global H. sapiens habitat suitability simulations. Our combined proxy- and model-based reconstructions suggest that ASM precipitation responded to a combination of Northern Hemisphere ice volume, greenhouse gas, and regional summer insolation forcing, with cooccurring primary orbital cycles of ~100-kyr, 41-kyr, and ~20-kyr. Between ~125 and 70 kyr ago, summer monsoon rains and temperatures increased in vast areas across Asia. This episode coincides with the earliest H. sapiens fossil occurrence at multiple localities in East Asia. Following the transcontinental increase in simulated habitat suitability, we suggest that ASM strengthening together with Southeast African climate deterioration may have promoted the initial H. sapiens dispersal from their African homeland to remote East Asia during the last interglacial.
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Affiliation(s)
- Hong Ao
- State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an710061, China
- Laoshan Laboratory, Qingdao266237, China
| | - Jiaoyang Ruan
- Center for Climate Physics, Institute for Basic Science, Busan46241, South Korea
- Pusan National University, Busan46241, South Korea
| | - María Martinón-Torres
- Dental Anthropology Group, National Research Center on Human Evolution, Burgos09002, Spain
- Department of Anthropology, University College London, LondonWC1H 0BW, United Kingdom
| | - Mario Krapp
- Department of Zoology, University of Cambridge, CambridgeCB2 1TN, United Kingdom
| | - Diederik Liebrand
- Department of Earth and Environmental Sciences, The University of Manchester, ManchesterM13 9PL, United Kingdom
| | - Mark J. Dekkers
- Palaeomagnetic Laboratory ‘Fort Hoofddijk’, Department of Earth Sciences, Faculty of Geosciences, Utrecht University, Utrecht3584 CD, The Netherlands
| | - Thibaut Caley
- Bordeaux Institut National Polytechnique, Environnements et Paléoenvironnements Océaniques et Continentaux, University of Bordeaux, Centre national de la recherche scientifique, UMR 5805, PessacF-33600, France
| | - Tara N. Jonell
- School of Geographical and Earth Sciences, University of Glasgow, GlasgowG12 8QQ, United Kingdom
| | - Zongmin Zhu
- School of Earth Sciences, China University of Geosciences, Wuhan430074, China
| | - Chunju Huang
- School of Earth Sciences, China University of Geosciences, Wuhan430074, China
| | - Xinxia Li
- State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an710061, China
| | - Ziyun Zhang
- State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an710061, China
| | - Qiang Sun
- College of Geology and Environment, University of Science and Technology, Xi’an710054, China
| | - Pingguo Yang
- College of Life Science, Shanxi Normal University, Taiyuan030031, China
| | - Jiali Jiang
- School of Earth Sciences, China University of Geosciences, Wuhan430074, China
| | - Xinzhou Li
- State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an710061, China
| | - Xiaoxun Xie
- State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an710061, China
| | - Yougui Song
- State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an710061, China
| | - Xiaoke Qiang
- State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an710061, China
| | - Peng Zhang
- State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an710061, China
- Laoshan Laboratory, Qingdao266237, China
| | - Zhisheng An
- State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an710061, China
- Institute of Global Environmental Change, Xi’an Jiaotong University, Xi’an710049, China
- Interdisciplinary Research Center of Earth Science Frontier, Beijing Normal University, Beijing100875, China
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4
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Ruan J, Timmermann A, Raia P, Yun KS, Zeller E, Mondanaro A, Di Febbraro M, Lemmon D, Castiglione S, Melchionna M. Climate shifts orchestrated hominin interbreeding events across Eurasia. Science 2023; 381:699-704. [PMID: 37561879 DOI: 10.1126/science.add4459] [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: 08/29/2022] [Accepted: 04/19/2023] [Indexed: 08/12/2023]
Abstract
When, where, and how often hominin interbreeding happened is largely unknown. We study the potential for Neanderthal-Denisovan admixture using species distribution models that integrate extensive fossil, archaeological, and genetic data with transient coupled general circulation model simulations of global climate and biomes. Our Pleistocene hindcast of past hominins' habitat suitability reveals pronounced climate-driven zonal shifts in the main overlap region of Denisovans and Neanderthals in central Eurasia. These shifts, which influenced the timing and intensity of potential interbreeding events, can be attributed to the response of climate and vegetation to past variations in atmospheric carbon dioxide and Northern Hemisphere ice-sheet volume. Therefore, glacial-interglacial climate swings likely played an important role in favoring gene flow between archaic humans.
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Affiliation(s)
- Jiaoyang Ruan
- Center for Climate Physics, Institute for Basic Science, Busan, South Korea
- Center for Climate Physics, Pusan National University, Busan, South Korea
| | - Axel Timmermann
- Center for Climate Physics, Institute for Basic Science, Busan, South Korea
- Center for Climate Physics, Pusan National University, Busan, South Korea
| | - Pasquale Raia
- DiSTAR, Monte Sant'Angelo, Napoli Università di Napoli Federico II, Naples, Italy
| | - Kyung-Sook Yun
- Center for Climate Physics, Institute for Basic Science, Busan, South Korea
- Center for Climate Physics, Pusan National University, Busan, South Korea
| | - Elke Zeller
- Center for Climate Physics, Institute for Basic Science, Busan, South Korea
- Department of Climate System, Pusan National University, Busan, South Korea
| | | | - Mirko Di Febbraro
- Department of Biosciences and Territory, University of Molise, C. da Fonte Lappone, Pesche, Italy
| | - Danielle Lemmon
- Center for Climate Physics, Institute for Basic Science, Busan, South Korea
- Center for Climate Physics, Pusan National University, Busan, South Korea
| | - Silvia Castiglione
- DiSTAR, Monte Sant'Angelo, Napoli Università di Napoli Federico II, Naples, Italy
| | - Marina Melchionna
- DiSTAR, Monte Sant'Angelo, Napoli Università di Napoli Federico II, Naples, Italy
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5
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Bagniewski W, Rousseau DD, Ghil M. The PaleoJump database for abrupt transitions in past climates. Sci Rep 2023; 13:4472. [PMID: 36934110 PMCID: PMC10024733 DOI: 10.1038/s41598-023-30592-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2022] [Accepted: 02/27/2023] [Indexed: 03/20/2023] Open
Abstract
Tipping points (TPs) in Earth's climate system have been the subject of increasing interest and concern in recent years, given the risk that anthropogenic forcing could cause abrupt, potentially irreversible, climate transitions. Paleoclimate records are essential for identifying past TPs and for gaining a thorough understanding of the underlying nonlinearities and bifurcation mechanisms. However, the quality, resolution, and reliability of these records can vary, making it important to carefully select the ones that provide the most accurate representation of past climates. Moreover, as paleoclimate time series vary in their origin, time spans, and periodicities, an objective, automated methodology is crucial for identifying and comparing TPs. To address these challenges, we introduce the open-source PaleoJump database, which contains a collection of carefully selected, high-resolution records originating in ice cores, marine sediments, speleothems, terrestrial records, and lake sediments. These records describe climate variability on centennial, millennial and longer time scales and cover all the continents and ocean basins. We provide an overview of their spatial distribution and discuss the gaps in coverage. Our statistical methodology includes an augmented Kolmogorov-Smirnov test and Recurrence Quantification Analysis; it is applied here, for illustration purposes, to selected records in which abrupt transitions are automatically detected and the presence of potential tipping elements is investigated. These transitions are shown in the PaleoJump database along with other essential information about the records, including location, temporal scale and resolution, as well as temporal plots. This open-source database represents, therefore, a valuable resource for researchers investigating TPs in past climates.
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Affiliation(s)
- Witold Bagniewski
- Department of Geosciences and Laboratoire de Météorologie Dynamique (CNRS and IPSL), École Normale Supérieure, PSL University, Paris, France.
| | - Denis-Didier Rousseau
- Geosciences Montpellier, CNRS, University of Montpellier, Montpellier, France
- Institute of Physics - CSE, Division of Geochronology and Environmental Isotopes, Silesian University of Technology, Gliwice, Poland
- Lamont-Doherty Earth Observatory, Columbia University, New York, USA
| | - Michael Ghil
- Department of Geosciences and Laboratoire de Météorologie Dynamique (CNRS and IPSL), École Normale Supérieure, PSL University, Paris, France
- Department of Atmospheric and Oceanic Sciences, University of California at Los Angeles, Los Angeles, USA
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6
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Abstract
The widely accepted “Milankovitch theory” explains insolation-induced waxing and waning of the ice sheets and their effect on the global climate on orbital timescales. In the past half century, however, the theory has often come under scrutiny, especially regarding its “100-ka problem.” Another drawback, but the one that has received less attention, is the “monsoon problem,” which pertains to the exclusion of monsoon dynamics in classic Milankovitch theory even though the monsoon prevails over the vast low-latitude (∼30° N to ∼30° S) region that covers half of the Earth’s surface and receives the bulk of solar radiation. In this review, we discuss the major issues with the current form of Milankovitch theory and the progress made at the research forefront. We suggest shifting the emphasis from the ultimate outcomes of the ice volume to the causal relationship between changes in northern high-latitude insolation and ice age termination events (or ice sheet melting rate) to help reconcile the classic “100-ka problem.” We discuss the discrepancies associated with the characterization of monsoon dynamics, particularly the so-called “sea-land precession-phase paradox” and the “Chinese 100-ka problem.” We suggest that many of these discrepancies are superficial and can be resolved by applying a holistic “monsoon system science” approach. Finally, we propose blending the conventional Kutzbach orbital monsoon hypothesis, which calls for summer insolation forcing of monsoons, with Milankovitch theory to formulate a combined “Milankovitch-Kutzbach hypothesis” that can potentially explain the dual nature of orbital hydrodynamics of the ice sheet and monsoon systems, as well as their interplays and respective relationships with the northern high-latitude insolation and inter-tropical insolation differential. Orbital-scale climate variations of Earth are dictated by ice sheet and monsoon Views of “monsoon system science” reinforce the Kutzbach monsoon hypothesis A unified Milankovitch-Kutzbach hypothesis better explains the orbital dual nature
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7
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Decoupled Asian monsoon intensity and precipitation during glacial-interglacial transitions on the Chinese Loess Plateau. Nat Commun 2022; 13:5397. [PMID: 36104341 PMCID: PMC9474459 DOI: 10.1038/s41467-022-33105-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2021] [Accepted: 08/30/2022] [Indexed: 11/08/2022] Open
Abstract
AbstractThe discrepancies among the variations in global ice volume, cave stalagmite δ18O and rainfall reconstructed by cosmogenic 10Be tremendously restrain our understanding of the evolution of the East Asian summer monsoon (EASM). Here, we present a 430-ka EASM mean annual precipitation record on the Chinese Loess Plateau obtained using branched glycerol dialkyl glycerol tetraethers based on a deep learning neural network; this rainfall record corresponds well with cave-derived δ18O data from southern China but differs from precipitation reconstructed by 10Be. Both branched tetraether membrane lipids and cave δ18O may be affected by soil moisture and atmospheric temperature when glacial and interglacial conditions alternated and were thus decoupled from atmospheric precipitation; instead, they represent variations in the intensity of the EASM. Furthermore, we demonstrate that the brGDGT-DLNN method can significantly extend the temporal scale record of the EASM and is not restricted by geographic location compared with stalagmite records.
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8
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Roles of insolation forcing and CO 2 forcing on Late Pleistocene seasonal sea surface temperatures. Nat Commun 2021; 12:5742. [PMID: 34593821 PMCID: PMC8484283 DOI: 10.1038/s41467-021-26051-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2020] [Accepted: 09/10/2021] [Indexed: 11/17/2022] Open
Abstract
Late Pleistocene changes in insolation, greenhouse gas concentrations, and ice sheets have different spatially and seasonally modulated climatic fingerprints. By exploring the seasonality of paleoclimate proxy data, we gain deeper insight into the drivers of climate changes. Here, we investigate changes in alkenone-based annual mean and Globigerinoides ruber Mg/Ca-based summer sea surface temperatures in the East China Sea and their linkages to climate forcing over the past 400,000 years. During interglacial-glacial cycles, there are phase differences between annual mean and seasonal (summer and winter) temperatures, which relate to seasonal insolation changes. These phase differences are most evident during interglacials. During glacial terminations, temperature changes were strongly affected by CO2. Early temperature minima, ~20,000 years before glacial terminations, except the last glacial period, coincide with the largest temperature differences between summer and winter, and with the timing of the lowest atmospheric CO2 concentration. These findings imply the need to consider proxy seasonality and seasonal climate variability to estimate climate sensitivity. How temperatures at different seasons differ in response to different forcings is not well known. Here, the authors reconstruct annual and seasonal sea surface temperatures in the East China Sea and show that they react differently to CO2 and insolation forcing on glacial-interglacial timescales.
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9
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Thomson JR, Holden PB, Anand P, Edwards NR, Porchier CA, Harris NBW. Tectonic and climatic drivers of Asian monsoon evolution. Nat Commun 2021; 12:4022. [PMID: 34188033 PMCID: PMC8242090 DOI: 10.1038/s41467-021-24244-z] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2020] [Accepted: 05/26/2021] [Indexed: 11/23/2022] Open
Abstract
Asian Monsoon rainfall supports the livelihood of billions of people, yet the relative importance of different drivers remains an issue of great debate. Here, we present 30 million-year model-based reconstructions of Indian summer monsoon and South East Asian monsoon rainfall at millennial resolution. We show that precession is the dominant direct driver of orbital variability, although variability on obliquity timescales is driven through the ice sheets. Orographic development dominated the evolution of the South East Asian monsoon, but Indian summer monsoon evolution involved a complex mix of contributions from orography (39%), precession (25%), atmospheric CO2 (21%), ice-sheet state (5%) and ocean gateways (5%). Prior to 15 Ma, the Indian summer monsoon was broadly stable, albeit with substantial orbital variability. From 15 Ma to 5 Ma, strengthening was driven by a combination of orography and glaciation, while closure of the Panama gateway provided the prerequisite for the modern Indian summer monsoon state through a strengthened Atlantic meridional overturning circulation.
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Affiliation(s)
| | - Philip B Holden
- School of Environment, Earth & Ecosystem Sciences, The Open University, Milton Keynes, UK.
| | - Pallavi Anand
- School of Environment, Earth & Ecosystem Sciences, The Open University, Milton Keynes, UK
| | - Neil R Edwards
- School of Environment, Earth & Ecosystem Sciences, The Open University, Milton Keynes, UK
- Cambridge Centre for Energy, Environment and Natural Resource Governance, University of Cambridge, Cambridge, UK
| | - Cécile A Porchier
- School of Environment, Earth & Ecosystem Sciences, The Open University, Milton Keynes, UK
- Department of Geography, University College London, London, UK
| | - Nigel B W Harris
- School of Environment, Earth & Ecosystem Sciences, The Open University, Milton Keynes, UK
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10
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Wang Y, Lu H, Wang K, Wang Y, Li Y, Clemens S, Lv H, Huang Z, Wang H, Hu X, Lu F, Zhang H. Combined high- and low-latitude forcing of East Asian monsoon precipitation variability in the Pliocene warm period. SCIENCE ADVANCES 2020; 6:6/46/eabc2414. [PMID: 33188021 PMCID: PMC7673752 DOI: 10.1126/sciadv.abc2414] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Accepted: 09/30/2020] [Indexed: 06/11/2023]
Abstract
East Asian monsoon variability in the Pliocene warm world has not been sufficiently studied because of the lack of direct records. We present a high-resolution precipitation record from Pliocene fluvial-lacustrine sequences in the Weihe Basin, Central China, a region sensitive to the East Asian monsoon. The record shows an abrupt monsoon shift at ~4.2 million years ago, interpreted as the result of high-latitude cooling, with an extratropical temperature decrease across a critical threshold. The precipitation time series exhibits a pronounced ~100-thousand year periodicity and the presence of precession and half-precession cycles, which suggest low-latitude forcing. The synchronous phase but mismatched amplitudes of the East Asian monsoon precipitation proxy and eccentricity suggest a nonlinear but sensitive precipitation response to temperature forcing in the Pliocene warm world. These observations highlight the role of high- and low-latitude forcing of East Asian monsoon variations on tectonic and orbital time scales.
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Affiliation(s)
- Yichao Wang
- School of Geography and Ocean Science, Nanjing University, Nanjing 210023, China
| | - Huayu Lu
- School of Geography and Ocean Science, Nanjing University, Nanjing 210023, China.
| | - Kexin Wang
- School of Geography and Ocean Science, Nanjing University, Nanjing 210023, China
| | - Yao Wang
- School of Geography and Ocean Science, Nanjing University, Nanjing 210023, China
| | - Yongxiang Li
- School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China
| | - Steven Clemens
- Earth, Environmental, and Planetary Sciences, Brown University, Providence, RI 02912, USA
| | - Hengzhi Lv
- School of Geography and Ocean Science, Nanjing University, Nanjing 210023, China
| | - Zihan Huang
- School of Geography and Ocean Science, Nanjing University, Nanjing 210023, China
| | - Hanlin Wang
- School of Geography and Ocean Science, Nanjing University, Nanjing 210023, China
| | - Xuzhi Hu
- School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China
| | - Fuzhi Lu
- School of Geography and Ocean Science, Nanjing University, Nanjing 210023, China
| | - Hanzhi Zhang
- School of Geography and Ocean Science, Nanjing University, Nanjing 210023, China
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11
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A Brief Commentary on the Interpretation of Chinese Speleothem δ18O Records as Summer Monsoon Intensity Tracers. QUATERNARY 2020. [DOI: 10.3390/quat3010007] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Zhang et al [...]
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12
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Scussolini P, Bakker P, Guo C, Stepanek C, Zhang Q, Braconnot P, Cao J, Guarino MV, Coumou D, Prange M, Ward PJ, Renssen H, Kageyama M, Otto-Bliesner B, Aerts JCJH. Agreement between reconstructed and modeled boreal precipitation of the Last Interglacial. SCIENCE ADVANCES 2019; 5:eaax7047. [PMID: 31799394 PMCID: PMC6867887 DOI: 10.1126/sciadv.aax7047] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2019] [Accepted: 09/19/2019] [Indexed: 05/05/2023]
Abstract
The last extended time period when climate may have been warmer than today was during the Last Interglacial (LIG; ca. 129 to 120 thousand years ago). However, a global view of LIG precipitation is lacking. Here, seven new LIG climate models are compared to the first global database of proxies for LIG precipitation. In this way, models are assessed in their ability to capture important hydroclimatic processes during a different climate. The models can reproduce the proxy-based positive precipitation anomalies from the preindustrial period over much of the boreal continents. Over the Southern Hemisphere, proxy-model agreement is partial. In models, LIG boreal monsoons have 42% wider area than in the preindustrial and produce 55% more precipitation and 50% more extreme precipitation. Austral monsoons are weaker. The mechanisms behind these changes are consistent with stronger summer radiative forcing over boreal high latitudes and with the associated higher temperatures during the LIG.
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Affiliation(s)
- Paolo Scussolini
- Institute for Environmental Studies, Vrije Universiteit Amsterdam, Amsterdam, Netherlands
- Corresponding author.
| | - Pepijn Bakker
- MARUM, Bremen, Germany
- Department of Earth Sciences, Vrije Universiteit Amsterdam, Amsterdam, Netherlands
| | - Chuncheng Guo
- NORCE Norwegian Research Centre, Bjerknes Centre for Climate Research, Bergen, Norway
| | - Christian Stepanek
- Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany
| | - Qiong Zhang
- Department of Physical Geography, Stockholm University, Sweden
| | - Pascale Braconnot
- Laboratoire des Sciences du Climat et de l’Environnement, Université Paris-Saclay, Gif-sur-Yvette, France
| | - Jian Cao
- Earth System Modeling Center, Nanjing University of Information Science and Technology, Nanjing, China
| | | | - Dim Coumou
- Institute for Environmental Studies, Vrije Universiteit Amsterdam, Amsterdam, Netherlands
- Potsdam Institute for Climate Impact Research, Germany
| | | | - Philip J. Ward
- Institute for Environmental Studies, Vrije Universiteit Amsterdam, Amsterdam, Netherlands
| | | | - Masa Kageyama
- Laboratoire des Sciences du Climat et de l’Environnement, Université Paris-Saclay, Gif-sur-Yvette, France
| | | | - Jeroen C. J. H. Aerts
- Institute for Environmental Studies, Vrije Universiteit Amsterdam, Amsterdam, Netherlands
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13
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The Asian Summer Monsoon: Teleconnections and Forcing Mechanisms—A Review from Chinese Speleothem δ18O Records. QUATERNARY 2019. [DOI: 10.3390/quat2030026] [Citation(s) in RCA: 49] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Asian summer monsoon (ASM) variability significantly affects hydro-climate, and thus socio-economics, in the East Asian region, where nearly one-third of the global population resides. Over the last two decades, speleothem δ18O records from China have been utilized to reconstruct ASM variability and its underlying forcing mechanisms on orbital to seasonal timescales. Here, we use the Speleothem Isotopes Synthesis and Analysis database (SISAL_v1) to present an overview of hydro-climate variability related to the ASM during three periods: the late Pleistocene, the Holocene, and the last two millennia. We highlight the possible global teleconnections and forcing mechanisms of the ASM on different timescales. The longest composite stalagmite δ18O record over the past 640 kyr BP from the region demonstrates that ASM variability on orbital timescales is dominated by the 23 kyr precessional cycles, which are in phase with Northern Hemisphere summer insolation (NHSI). During the last glacial, millennial changes in the intensity of the ASM appear to be controlled by North Atlantic climate and oceanic feedbacks. During the Holocene, changes in ASM intensity were primarily controlled by NHSI. However, the spatio-temporal distribution of monsoon rain belts may vary with changes in ASM intensity on decadal to millennial timescales.
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14
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Diverse manifestations of the mid-Pleistocene climate transition. Nat Commun 2019; 10:352. [PMID: 30664647 PMCID: PMC6341081 DOI: 10.1038/s41467-018-08257-9] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2018] [Accepted: 12/20/2018] [Indexed: 12/03/2022] Open
Abstract
The mid-Pleistocene transition (MPT) is widely recognized as a shift in paleoclimatic periodicity from 41- to 100-kyr cycles, which largely reflects integrated changes in global ice volume, sea level, and ocean temperature from the marine realm. However, much less is known about monsoon-induced terrestrial vegetation change across the MPT. Here, on the basis of a 1.7-million-year δ13C record of loess carbonates from the Chinese Loess Plateau, we document a unique MPT reflecting terrestrial vegetation changes from a dominant 23-kyr periodicity before 1.2 Ma to combined 100, 41, and 23-kyr cycles after 0.7 Ma, very different from the conventional MPT characteristics. Model simulations further reveal that the MPT transition likely reflects decreased sensitivity of monsoonal hydroclimate to insolation forcing as the Northern Hemisphere became increasingly glaciated through the MPT. Our proxy-model comparison suggests varied responses of temperature and precipitation to astronomical forcing under different ice/CO2 boundary conditions, which greatly improves our understanding of monsoon variability and dynamics from the natural past to the anthropogenic future. The mid-Pleistocene transition is recognized as a shift in paleoclimatic periodicity from 41- to 100-kyr cycles. Here the authors present a unique mid-Pleistocene transition of coupled monsoon-vegetation changes from 23- to 100-kyr cycles, which indicates varied sensitivity of past climate to astronomical and ice/CO2 forcing.
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15
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Skonieczny C, McGee D, Winckler G, Bory A, Bradtmiller LI, Kinsley CW, Polissar PJ, De Pol-Holz R, Rossignol L, Malaizé B. Monsoon-driven Saharan dust variability over the past 240,000 years. SCIENCE ADVANCES 2019; 5:eaav1887. [PMID: 30613782 PMCID: PMC6314818 DOI: 10.1126/sciadv.aav1887] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/22/2018] [Accepted: 11/21/2018] [Indexed: 06/09/2023]
Abstract
Reconstructions of past Saharan dust deposition in marine sediments provide foundational records of North African climate over time scales of 103 to 106 years. Previous dust records show primarily glacial-interglacial variability in the Pleistocene, in contrast to other monsoon records showing strong precessional variability. Here, we present the first Saharan dust record spanning multiple glacial cycles obtained using 230Th normalization, an improved method of calculating fluxes. Contrary to previous data, our record from the West African margin demonstrates high correlation with summer insolation and limited glacial-interglacial changes, indicating coherent variability in the African monsoon belt throughout the late Pleistocene. Our results demonstrate that low-latitude Saharan dust emissions do not vary synchronously with high- and mid-latitude dust emissions, and they call into question the use of existing Plio-Pleistocene dust records to investigate links between climate and hominid evolution.
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Affiliation(s)
- C. Skonieczny
- Laboratoire Géosciences Paris-Sud, UMR CNRS 8148, Université de Paris-Sud, Université Paris-Saclay, 91405 Orsay Cedex, France
- Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - D. McGee
- Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - G. Winckler
- Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, USA
- Department of Earth and Environmental Sciences, Columbia University, New York, NY, USA
| | - A. Bory
- Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, USA
- Université de Lille, CNRS, Université Littoral Cote d’Opale, UMR 8187, LOG, Laboratoire d’Océanologie et de Géosciences, Lille, France
| | - L. I. Bradtmiller
- Department of Environmental Studies, Macalester College, St. Paul, MN, USA
| | - C. W. Kinsley
- Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - P. J. Polissar
- Department of Earth and Environmental Sciences, Columbia University, New York, NY, USA
| | - R. De Pol-Holz
- GAIA-Antártica, Universidad de Magallanes, Punta Arenas, Chile
| | - L. Rossignol
- Laboratoire Environnements et Paléoenvironnements Océaniques et Continentaux, UMR CNRS 5805, Université de Bordeaux, Pessac, France
| | - B. Malaizé
- Laboratoire Environnements et Paléoenvironnements Océaniques et Continentaux, UMR CNRS 5805, Université de Bordeaux, Pessac, France
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16
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Chen J, Zhang Z, Liu J, Rao Z, Huang W, Zhang X, Chen S. "North-South" dipolar mode of precipitation changes in eastern China extends to the Last Deglaciation. Sci Bull (Beijing) 2018; 63:1604-1605. [PMID: 36658849 DOI: 10.1016/j.scib.2018.12.005] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Jianhui Chen
- Key Laboratory of Western China's Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China.
| | - Zhiping Zhang
- Key Laboratory of Western China's Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China
| | - Jianbao Liu
- Key Laboratory of Western China's Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China; Key Laboratory of Alpine Ecology and Biodiversity (LAEB), Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China; Center for Excellence in Tibetan Plateau Earth System Sciences, Chinese Academy of Sciences, Beijing 100101, China.
| | - Zhiguo Rao
- College of Resources and Environmental Sciences, Hunan Normal University, Changsha 410081, China
| | - Wei Huang
- Key Laboratory of Western China's Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China
| | - Xu Zhang
- Key Laboratory of Western China's Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China; Alfred Wegener Institute Helmholtz Center for Polar and Marine Research, Bremerhaven 27570, Germany
| | - Shengqian Chen
- Key Laboratory of Western China's Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China
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17
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Gebregiorgis D, Hathorne EC, Giosan L, Clemens S, Nürnberg D, Frank M. Southern Hemisphere forcing of South Asian monsoon precipitation over the past ~1 million years. Nat Commun 2018; 9:4702. [PMID: 30410007 PMCID: PMC6224551 DOI: 10.1038/s41467-018-07076-2] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2018] [Accepted: 10/11/2018] [Indexed: 11/19/2022] Open
Abstract
The orbital-scale timing of South Asian monsoon (SAM) precipitation is poorly understood. Here we present new SST and seawater δ18O (δ18Osw) records from the Bay of Bengal, the core convective region of the South Asian monsoon, over the past 1 million years. Our records reveal that SAM precipitation peaked in the precession band ~9 kyrs after Northern Hemisphere summer insolation maxima, in phase with records of SAM winds in the Arabian Sea and eastern Indian Ocean. Precession-band variance, however, accounts for ~30% of the total variance of SAM precipitation while it was either absent or dominant in records of the East Asian monsoon (EAM). This and the observation that SAM precipitation was phase locked with obliquity minima and was sensitive to Southern Hemisphere warming provides clear evidence that SAM and EAM precipitation responded differently to orbital forcing and highlights the importance of internal processes forcing monsoon variability. The orbital-scale timing of South Asian monsoon precipitation is poorly understood. Here the authors show that the long held view that precession drove changes in monsoon strength is wrong, and that obliquity and eccentricity played a stronger role.
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Affiliation(s)
- D Gebregiorgis
- GEOMAR Helmholtz Centre for Ocean Research Kiel, Wischhofstraße 1-3, 24148, Kiel, Germany. .,Department of Geosciences, Georgia State University, Atlanta, GA, 30303, USA.
| | - E C Hathorne
- GEOMAR Helmholtz Centre for Ocean Research Kiel, Wischhofstraße 1-3, 24148, Kiel, Germany
| | - L Giosan
- Woods Hole Oceanographic Institution, Woods Hole, MA, 02543, USA
| | - S Clemens
- Earth, Environmental, and Planetary Sciences, Brown University, Providence, RI, 02912, USA
| | - D Nürnberg
- GEOMAR Helmholtz Centre for Ocean Research Kiel, Wischhofstraße 1-3, 24148, Kiel, Germany
| | - M Frank
- GEOMAR Helmholtz Centre for Ocean Research Kiel, Wischhofstraße 1-3, 24148, Kiel, Germany
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18
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McGee D. Shifting summer rains. Science 2018; 362:518-520. [PMID: 30385558 DOI: 10.1126/science.aav5280] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Affiliation(s)
- David McGee
- Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, USA.
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