DOI: 10.1002/grl.50365
论文题名: The stability of an evolving Atlantic meridional overturning circulation
作者: Liu W. ; Liu Z. ; Hu A.
刊名: Geophysical Research Letters
ISSN: 0094-9137
EISSN: 1944-8868
出版年: 2013
卷: 40, 期: 8 起始页码: 1562
结束页码: 1568
语种: 英语
英文关键词: AMOC hysteresis
; AMOC stability
; feedback
Scopus关键词: Abrupt climate change
; Atlantic meridional overturning circulations
; Coupled atmosphere ocean general circulation model
; Freshwater transports
; Last Glacial Maximum
; Multiple equilibrium
; Paleoclimate studies
; Stability indicators
; Feedback
; Stability
; Water
; Oceanography
; air-sea interaction
; Atlantic Multidecadal Oscillation
; convergence
; freshwater ecosystem
; Last Glacial Maximum
; overturn
; paleoclimate
; simulation
; Atlantic Ocean
; Bering Strait
英文摘要: In this study, we propose a generalized stability indicator, L, for a slowly evolving and quasi-steady Atlantic meridional overturning circulation (AMOC), which represents a feedback related to the AMOC and its associated freshwater transport within the Atlantic basin. As an improvement from previous indicators for the AMOC in equilibrium, this generalized indicator does not require a divergence-free freshwater transport in the Atlantic for a collapsed AMOC, which enables it to correctly monitor the AMOC stability through the AMOC hysteresis loop in the coupled atmosphere-ocean general circulation models. From the simulation, the indicator L suggests that the AMOC is in a stable regime, with single equilibrium under the present-day and the Last Glacial Maximum (LGM) climates. However, under the present-day climate, a Bering Strait (BS) closure will diminish the freshwater outflow from the North Atlantic into the Arctic as the AMOC collapses, resulting in a freshwater convergence in the Atlantic basin and making the AMOC reside in a stable collapsed state, i.e., the AMOC exhibits characteristics of multiple equilibria. Further analysis shows that the BS effect is much reduced under the LGM climate. This generalized indicator L has great implications for paleoclimate studies in understanding the abrupt climate change due to the instability of the AMOC. Key Points A generalized stability indicator is developed for the slowly evolving AMOC. ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84877955133&doi=10.1002%2fgrl.50365&partnerID=40&md5=7fcbed2bf26965eee8ce3480971be98e
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6401
Appears in Collections: 气候减缓与适应
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作者单位: Key Laboratory of Meteorological Disaster of Ministry of Education, School of Marine Sciences, Nanjing University of Information Science and Technology, Nanjing, China
Recommended Citation:
Liu W.,Liu Z.,Hu A.. The stability of an evolving Atlantic meridional overturning circulation[J]. Geophysical Research Letters,2013-01-01,40(8).