globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1908670117
论文题名:
Timing and magnitude of southern ocean sea ice/carbon cycle feedbacks
作者: Stein K.; Timmermann A.; Kwon E.Y.; Friedrich T.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2020
卷: 117, 期:9
起始页码: 4498
结束页码: 4504
语种: 英语
英文关键词: Carbon cycle ; Glacial cycles ; Sea ice ; Southern Ocean
Scopus关键词: ice ; surface water ; air conditioning ; Article ; atmosphere ; biogeochemistry ; carbon cycle ; cold climate ; concentration (parameter) ; environmental exposure ; priority journal ; sea ice ; simulation ; Southern Ocean ; steady state
英文摘要: The Southern Ocean (SO) played a prominent role in the exchange of carbon between ocean and atmosphere on glacial timescales through its regulation of deep ocean ventilation. Previous studies indicated that SO sea ice could dynamically link several processes of carbon sequestration, but these studies relied on models with simplified ocean and sea ice dynamics or snapshot simulations with general circulation models. Here, we use a transient run of an intermediate complexity climate model, covering the past eight glacial cycles, to investigate the orbital-scale dynamics of deep ocean ventilation changes due to SO sea ice. Cold climates increase sea ice cover, sea ice export, and Antarctic Bottom Water formation, which are accompanied by increased SO upwelling, stronger poleward export of Circumpolar Deep Water, and a reduction of the atmospheric exposure time of surface waters by a factor of 10. Moreover, increased brine formation around Antarctica enhances deep ocean stratification, which could act to decrease vertical mixing by a factor of four compared with the current climate. Sensitivity tests with a steady-state carbon cycle model indicate that the two mechanisms combined can reduce atmospheric carbon by 40 ppm, with ocean stratification acting early within a glacial cycle to amplify the carbon cycle response. © 2020 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/164296
Appears in Collections:气候变化与战略

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作者单位: Stein, K., Center for Climate Physics, Institute for Basic Science, Busan, 46241, South Korea, Pusan National University, Busan, 46241, South Korea; Timmermann, A., Center for Climate Physics, Institute for Basic Science, Busan, 46241, South Korea, Pusan National University, Busan, 46241, South Korea; Kwon, E.Y., Center for Climate Physics, Institute for Basic Science, Busan, 46241, South Korea, Pusan National University, Busan, 46241, South Korea; Friedrich, T., Department of Oceanography, University of Hawai'i at Mānoa, Honolulu, HI 96822, United States

Recommended Citation:
Stein K.,Timmermann A.,Kwon E.Y.,et al. Timing and magnitude of southern ocean sea ice/carbon cycle feedbacks[J]. Proceedings of the National Academy of Sciences of the United States of America,2020-01-01,117(9)
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