globalchange  > 气候变化与战略
DOI: 10.1038/s41561-020-0610-5
论文题名:
Last glacial atmospheric CO2 decline due to widespread Pacific deep-water expansion
作者: Yu J.; Menviel L.; Jin Z.D.; Anderson R.F.; Jian Z.; Piotrowski A.M.; Ma X.; Rohling E.J.; Zhang F.; Marino G.; McManus J.F.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2020
卷: 13, 期:9
起始页码: 628
结束页码: 633
语种: 英语
英文关键词: atmospheric chemistry ; carbon dioxide ; carbon isotope ; carbonate ; deep water ; expansion ; Last Glacial ; Last Glacial Maximum ; oceanic circulation ; paleoceanography ; radiocarbon dating ; water mass ; Atlantic Ocean ; Atlantic Ocean (South)
英文摘要: Ocean circulation critically affects the global climate and atmospheric carbon dioxide through redistribution of heat and carbon in the Earth system. Despite intensive research, the nature of past ocean circulation changes remains elusive. Here we present deep-water carbonate ion concentration reconstructions for widely distributed locations in the Atlantic Ocean, where low carbonate ion concentrations indicate carbon-rich waters. These data show a low-carbonate-ion water mass that extended northward up to about 20° S in the South Atlantic at 3–4 km depth during the Last Glacial Maximum. In combination with radiocarbon ages, neodymium isotopes and carbon isotopes, we conclude that this low-carbonate-ion signal reflects a widespread expansion of carbon-rich Pacific deep waters into the South Atlantic, revealing a glacial deep Atlantic circulation scheme different than commonly considered. Comparison of high-resolution carbonate ion records from different water depths in the South Atlantic indicates that this Pacific deep-water expansion developed from approximately 38,000 to 28,000 years ago. We infer that its associated carbon sequestration may have contributed critically to the contemporaneous decline in atmospheric carbon dioxide, thereby helping to initiate the glacial maximum. © 2020, The Author(s), under exclusive licence to Springer Nature Limited.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169698
Appears in Collections:气候变化与战略

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作者单位: Research School of Earth Sciences, The Australian National University, Canberra, ACT, Australia; State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an, China; Climate Change Research Centre, University of New South Wales, Sydney, NSW, Australia; CAS Center for Excellence in Quaternary Science and Global Change, Xi’an, China; Open Studio for Oceanic–Continental Climate and Environment Changes, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China; Lamont–Doherty Earth Observatory, Columbia University, New York, NY, United States; State Key Laboratory of Marine Geology, Tongji University, Shanghai, China; Department of Earth Sciences, University of Cambridge, Cambridge, United Kingdom; Ocean and Earth Science, National Oceanography Centre, University of Southampton, Southampton, United Kingdom; Centro de Investigación Mariña, GEOMA, Palaeoclimatology Lab, Universidade de Vigo, Vigo, Spain

Recommended Citation:
Yu J.,Menviel L.,Jin Z.D.,et al. Last glacial atmospheric CO2 decline due to widespread Pacific deep-water expansion[J]. Nature Geoscience,2020-01-01,13(9)
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