globalchange  > 过去全球变化的重建
DOI: 10.1007/s00382-014-2153-1
Scopus记录号: 2-s2.0-84939873502
论文题名:
On the stability of the Atlantic meridional overturning circulation during the last deglaciation
作者: Liu W.; Liu Z.; Cheng J.; Hu H.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2015
卷: 44, 期:2017-05-06
起始页码: 1257
结束页码: 1275
语种: 英语
英文关键词: AMOC ; Feedback ; Freshwater transport ; Stability indicator ; The last deglaciation
英文摘要: Using a generalized stability indicator L, we explore the stability of the Atlantic meridional overturning circulation (AMOC) during the last deglaciation based on a paleoclimate simulation. From the last glacial maximum, as forced by various external climate forcings, notably the meltwater forcing, the AMOC experiences a collapse and a subsequent rapid recovery in the early stage of deglaciation. This change of the AMOC induces an anomalous freshwater divergence and later convergence across the Atlantic and therefore leads to a positive L, suggesting a negative basin-scale salinity advection feedback and, in turn, a mono-stable deglacial AMOC. Further analyses show that most anomalous freshwater is induced by the AMOC via the southern boundary of the Atlantic at 34°S where the freshwater transport (MovS) is about equally controlled by the upper branch of the AMOC and the upper ocean salinity along 34°S. From 19 to 17 ka, as a result of multiple climate feedbacks associated with the AMOC change, the upper ocean at 34°S is largely salinified, which helps to induce a switch in MovS, from import to export. Our study has important implications to the deglacial simulations by climate models. A decomposition of L shows that the AMOC stability is mostly determined by two terms, the salinity stratification at 34°S and the change of stratification with the AMOC. Both terms appear positive in model. However, the former is likely to be distorted towards positive, as associated with a common bias existing over the South Atlantic in climate models. Therefore, the AMOC is potentially biased towards mono-stability in most paleoclimate simulations. © 2014, Springer-Verlag Berlin Heidelberg.
资助项目: NSFC, National Natural Science Foundation of China
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54226
Appears in Collections:过去全球变化的重建

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作者单位: Cooperative Institute for Climate and Satellites, North Carolina State University, Raleigh, NC, United States; NOAA National Climatic Data Center, Asheville, NC, United States; CASPO, Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA, United States; Lab. Climate, Ocean and Atmosphere Studies, Peking University, Beijing, China; Center for Climatic Research, University of Wisconsin-Madison, Madison, WI, United States; Key Laboratory of Meteorological Disaster of Ministry of Education, School of Marine Sciences, Nanjing University of Information Science and Technology, Nanjing, China; School of Atmospheric Sciences, Nanjing University, Nanjing, China

Recommended Citation:
Liu W.,Liu Z.,Cheng J.,et al. On the stability of the Atlantic meridional overturning circulation during the last deglaciation[J]. Climate Dynamics,2015-01-01,44(2017-05-06)
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