Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1073/pnas.1908670117 |
Timing and magnitude of Southern Ocean sea ice/carbon cycle feedbacks | |
Stein, Karl1,2; Timmermann, Axel1,2; Kwon, Eun Young1,2; Friedrich, Tobias3 | |
2020-03-03 | |
发表期刊 | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA |
ISSN | 0027-8424 |
出版年 | 2020 |
卷号 | 117期号:9页码:4498-4504 |
文章类型 | Article |
语种 | 英语 |
国家 | South Korea; USA |
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. |
英文关键词 | Southern Ocean sea ice glacial cycles carbon cycle |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000518473500017 |
WOS关键词 | EARTH SYSTEM MODEL ; GLACIAL CYCLES ; OVERTURNING CIRCULATION ; CARBON-CYCLE ; ICE SHEETS ; CLIMATE ; STRATIFICATION ; PRODUCTIVITY ; TEMPERATURE ; TRANSPORT |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/249598 |
专题 | 地球科学 |
作者单位 | 1.Inst Basic Sci, Ctr Climate Phys, Busan 46241, South Korea; 2.Pusan Natl Univ, Busan 46241, South Korea; 3.Univ Hawaii Manoa, Dept Oceanog, Honolulu, HI 96822 USA |
推荐引用方式 GB/T 7714 | Stein, Karl,Timmermann, Axel,Kwon, Eun Young,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,2020,117(9):4498-4504. |
APA | Stein, Karl,Timmermann, Axel,Kwon, Eun Young,&Friedrich, Tobias.(2020).Timing and magnitude of Southern Ocean sea ice/carbon cycle feedbacks.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,117(9),4498-4504. |
MLA | Stein, Karl,et al."Timing and magnitude of Southern Ocean sea ice/carbon cycle feedbacks".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 117.9(2020):4498-4504. |
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