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DOI | 10.1038/NGEO2974 |
Abrupt North Atlantic circulation changes in response to gradual CO2 forcing in a glacial climate state | |
Zhang, Xu1,2; Knorr, Gregor1,3; Lohmann, Gerrit1,4; Barker, Stephen3 | |
2017-07-01 | |
发表期刊 | NATURE GEOSCIENCE
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ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2017 |
卷号 | 10期号:7 |
文章类型 | Article |
语种 | 英语 |
国家 | Germany; Peoples R China; Wales |
英文摘要 | Glacial climate is marked by abrupt, millennial-scale climate changes known as Dansgaard-Oeschger cycles. The most pronounced stadial coolings, Heinrich events, are associated with massive iceberg discharges to the North Atlantic. These events have been linked to variations in the strength of the Atlantic meridional overturning circulation. However, the factors that lead to abrupt transitions between strong and weak circulation regimes remain unclear. Here we show that, in a fully coupled atmosphere-ocean model, gradual changes in atmospheric CO2 concentrations can trigger abrupt climate changes, associated with a regime of bi-stability of the Atlantic meridional overturning circulation under intermediate glacial conditions. We find that changes in atmospheric CO2 concentrations alter the transport of atmospheric moisture across Central America, which modulates the freshwater budget of the North Atlantic and hence deep-water formation. In our simulations, a change in atmospheric CO2 levels of about 15 ppmv-comparable to variations during Dansgaard-Oeschger cycles containing Heinrich events-is sufficient to cause transitions between a weak stadial and a strong interstadial circulation mode. Because changes in the Atlantic meridional overturning circulation are thought to alter atmospheric CO2 levels, we infer that atmospheric CO2 may serve as a negative feedback to transitions between strong and weak circulation modes. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000404621000015 |
WOS关键词 | OCEAN CIRCULATION ; MOISTURE TRANSPORT ; SALT OSCILLATOR ; HEINRICH EVENTS ; SOUTHERN-OCEAN ; RAPID CHANGES ; CARBON-CYCLE ; ICE ; VARIABILITY ; MODEL |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
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/35053 |
专题 | 地球科学 气候变化 |
作者单位 | 1.Helmholtz Ctr Polar & Marine Res, Alfred Wegener Inst, Bussestr 24, D-27570 Bremerhaven, Germany; 2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266061, Peoples R China; 3.Cardiff Univ, Sch Earth & Ocean Sci, Cardiff CF10 3AT, S Glam, Wales; 4.Univ Bremen, MARUM Ctr Marine Environm Sci, Leobener Str, D-28359 Bremen, Germany |
推荐引用方式 GB/T 7714 | Zhang, Xu,Knorr, Gregor,Lohmann, Gerrit,et al. Abrupt North Atlantic circulation changes in response to gradual CO2 forcing in a glacial climate state[J]. NATURE GEOSCIENCE,2017,10(7). |
APA | Zhang, Xu,Knorr, Gregor,Lohmann, Gerrit,&Barker, Stephen.(2017).Abrupt North Atlantic circulation changes in response to gradual CO2 forcing in a glacial climate state.NATURE GEOSCIENCE,10(7). |
MLA | Zhang, Xu,et al."Abrupt North Atlantic circulation changes in response to gradual CO2 forcing in a glacial climate state".NATURE GEOSCIENCE 10.7(2017). |
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