globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1802573115
论文题名:
Ocean circulation; ice shelf; and sea ice interactions explain Dansgaard–Oeschger cycles
作者: Boers N.; Ghil M.; Rousseau D.-D.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2018
卷: 115, 期:47
起始页码: E11005
结束页码: E11014
语种: 英语
英文关键词: Bayesian parameter estimation ; Millennial climate variability ; Nonlinear climate modeling ; North–south seesaw
Scopus关键词: Antarctica ; article ; climate change ; Greenland ; ice cover ; ice shelf ; sea ice ; warming ; water temperature
英文摘要: The last glacial interval experienced abrupt climatic changes called Dansgaard–Oeschger (DO) events. These events manifest themselves as rapid increases followed by slow decreases of oxygen isotope ratios in Greenland ice core records. Despite promising advances, a comprehensive theory of the DO cycles, with their repeated ups and downs of isotope ratios, is still lacking. Here, based on earlier hypotheses, we introduce a dynamical model that explains the DO variability by rapid retreat and slow regrowth of thick ice shelves and thin sea ice in conjunction with changing subsurface water temperatures due to insulation by the ice cover. Our model successfully reproduces observed features of the records, such as the sawtooth shape of the DO cycles, waiting times between DO events across the last glacial, and the shifted antiphase relationship between Greenland and Antarctic ice cores. Our results show that these features can be obtained via internal feedbacks alone. Warming subsurface waters could have also contributed to the triggering of Heinrich events. Our model thus offers a unified framework for explaining major features of multimillennial climate variability during glacial intervals. © 2018 National Academy of Sciences. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/162293
Appears in Collections:气候变化与战略

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作者单位: Boers, N., Geosciences Department, Laboratoire de Météorologie Dynamique (CNRS and Institute Pierre Simon Laplace, IPSL), École Normale Supérieure and Paris Sciences and Lettres (PSL) Research University, Paris, 75005, France, Research Domain IV–Transdisciplinary Concepts and Methods, Potsdam Institute for Climate Impact Research, Potsdam, 14473, Germany, Grantham Institute, Imperial College, London, SW7 2AZ, United Kingdom; Ghil, M., Geosciences Department, Laboratoire de Météorologie Dynamique (CNRS and Institute Pierre Simon Laplace, IPSL), École Normale Supérieure and Paris Sciences and Lettres (PSL) Research University, Paris, 75005, France, Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, CA 90095, United States; Rousseau, D.-D., Geosciences Department, Laboratoire de Météorologie Dynamique (CNRS and Institute Pierre Simon Laplace, IPSL), École Normale Supérieure and Paris Sciences and Lettres (PSL) Research University, Paris, 75005, France, Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY 10964, United States

Recommended Citation:
Boers N.,Ghil M.,Rousseau D.-D.. Ocean circulation; ice shelf; and sea ice interactions explain Dansgaard–Oeschger cycles[J]. Proceedings of the National Academy of Sciences of the United States of America,2018-01-01,115(47)
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