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DOI | 10.1007/s00382-016-3190-8 |
The impact of multidecadal Atlantic meridional overturning circulation variations on the Southern Ocean | |
Zhang, Liping1,2; Delworth, Thomas L.2; Zeng, Fanrong2 | |
2017-03-01 | |
发表期刊 | CLIMATE DYNAMICS
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ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2017 |
卷号 | 48 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | The impact of multidecadal variations of the Atlantic meridional overturning circulation (AMOC) on the Southern Ocean (SO) is investigated in the current paper using a coupled ocean-atmosphere model. We find that the AMOC can influence the SO via fast atmosphere teleconnections and subsequent ocean adjustments. A stronger than normal AMOC induces an anomalous warm SST over the North Atlantic, which leads to a warming of the Northern Hemisphere troposphere extending into the tropics. This induces an increased equator-to-pole temperature gradient in the Southern Hemisphere (SH) upper troposphere and lower stratosphere due to an amplified tropical upper tropospheric warming as a result of increased latent heat release. This altered gradients leads to a poleward displacement of the SH westerly jet. The wind change over the SO then cools the SST at high latitudes by anomalous northward Ekman transports. The wind change also weakens the Antarctic bottom water (AABW) cell through changes in surface heat flux forcing. The poleward shifted westerly wind decreases the long term mean easterly winds over the Weddell Sea, thereby reducing the turbulent heat flux loss, decreasing surface density and therefore leading to a weakening of the AABW cell. The weakened AABW cell produces a temperature dipole in the SO, with a warm anomaly in the subsurface and a cold anomaly in the surface that corresponds to an increase of Antarctic sea ice. Opposite conditions occur for a weaker than normal AMOC. Our study here suggests that efforts to attribute the recent observed SO variability to various factors should take into consideration not only local process but also remote forcing from the North Atlantic. |
英文关键词 | Atlantic meridional overturning circulation Southern Ocean Antarctic sea ice |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000395060900039 |
WOS关键词 | THERMOHALINE CIRCULATION ; NORTH-ATLANTIC ; DATA ASSIMILATION ; BIPOLAR SEESAW ; FRESH-WATER ; CLIMATE ; VARIABILITY ; TEMPERATURE ; SYSTEM ; ENSO |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
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/36060 |
专题 | 气候变化 |
作者单位 | 1.Princeton Univ, Atmospher & Ocean Sci, Princeton, NJ 08544 USA; 2.NOAA, Geophys Fluid Dynam Lab, 201 Forrestal Rd, Princeton, NJ 08540 USA |
推荐引用方式 GB/T 7714 | Zhang, Liping,Delworth, Thomas L.,Zeng, Fanrong. The impact of multidecadal Atlantic meridional overturning circulation variations on the Southern Ocean[J]. CLIMATE DYNAMICS,2017,48. |
APA | Zhang, Liping,Delworth, Thomas L.,&Zeng, Fanrong.(2017).The impact of multidecadal Atlantic meridional overturning circulation variations on the Southern Ocean.CLIMATE DYNAMICS,48. |
MLA | Zhang, Liping,et al."The impact of multidecadal Atlantic meridional overturning circulation variations on the Southern Ocean".CLIMATE DYNAMICS 48(2017). |
条目包含的文件 | 条目无相关文件。 |
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