globalchange  > 过去全球变化的重建
DOI: 10.1007/s00382-015-2651-9
Scopus记录号: 2-s2.0-84959144245
论文题名:
The sensitivity of the Atlantic meridional overturning circulation to enhanced freshwater discharge along the entire, eastern and western coast of Greenland
作者: Yu L.; Gao Y.; Otterå O.H.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2016
卷: 46, 期:2017-05-06
起始页码: 1351
结束页码: 1369
语种: 英语
英文关键词: AMOC ; Freshwater-hosing experiment ; Greenland ice sheet melting ; Upper Labrador Sea water formation
英文摘要: The possible responses of the Atlantic meridional overturning circulation (AMOC) to increased freshwater discharge along the Greenland coast has become an issue of growing concern given the increasing rate of the Greenland ice sheet (GrIS) melting. A recent model study suggested a weakened AMOC of about 13–30 % when a freshwater anomaly of 0.1 Sv (1 Sv = 106 m3 s−1) was released along the entire Greenland coast during the late twentieth century (1965–2000). In this study we use a fully coupled climate model to examine the sensitivity of AMOC to a similar amount of freshwater forcing, but released separately along the eastern, the western and the entire Greenland coast. Our results show that in all three cases there is a general weakening of the AMOC mainly due to a reduced formation of Labrador Sea Water. Moreover, when additional freshwater is released along the eastern coast of Greenland, the AMOC weakens more compared to the other two cases. The different degree of convective mixing reduction in the Irminger Sea is the main reason for the spread in AMOC responses in the three freshwater-hosing experiments. Compared to the other two experiments, the eastern-coast experiment shows a relative warming in the Labrador Sea and the generation of a negative Greenland tip jet-like wind-pattern anomaly. These anomalies lead to a weaker convective mixing in the southern Irminger Sea, and result subsequently in less formation of the simulated Upper Labrador Sea Water (ULSW) in the eastern coast experiment. This study therefore highlights a potential important role for ULSW formation in determining the sensitivity of the AMOC in response to large GrIS melting. © 2015, Springer-Verlag Berlin Heidelberg.
资助项目: CAS, Chinese Academy of Sciences
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53793
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作者单位: Climate Changes Research Center, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China; Nansen Environmental and Remote Sensing Center/Bjerknes Center for Climate Research, Bergen, Norway; Uni Research Climate and Bjerknes Centre for Climate Research, Bergen, Norway; Nansen-Zhu International Research Centre, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China

Recommended Citation:
Yu L.,Gao Y.,Otterå O.H.. The sensitivity of the Atlantic meridional overturning circulation to enhanced freshwater discharge along the entire, eastern and western coast of Greenland[J]. Climate Dynamics,2016-01-01,46(2017-05-06)
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