DOI: 10.1002/2014GL060891
论文题名: Linear weakening of the AMOC in response to receding glacial ice sheets in CCSM3
作者: Zhu J. ; Liu Z. ; Zhang X. ; Eisenman I. ; Liu W.
刊名: Geophysical Research Letters
ISSN: 0094-9804
EISSN: 1944-9535
出版年: 2014
卷: 41, 期: 17 起始页码: 6252
结束页码: 6258
语种: 英语
Scopus关键词: Climate models
; Feedback
; Glaciers
; Sea ice
; Atlantic meridional overturning circulations
; Community climate system model
; Deep convection
; Ice-sheet retreat
; Melt-water discharges
; Northern Hemispheres
; Orographic effects
; Subpolar North Atlantic
; Oceanography
; convection
; deglaciation
; glacial environment
; ice sheet
; meltwater
; meridional circulation
; Northern Hemisphere
; wind-driven circulation
英文摘要: The transient response of the Atlantic Meridional Overturning Circulation (AMOC) to a deglacial ice sheet retreat is studied using the Community Climate System Model version 3 (CCSM3), with a focus on orographic effects rather than meltwater discharge. It is found that the AMOC weakens significantly (41%) in response to the deglacial ice sheet retreat. The AMOC weakening follows the decrease of the Northern Hemisphere ice sheet volume linearly, with no evidence of abrupt thresholds. A wind-driven mechanism is proposed to explain the weakening of the AMOC: lowering the Northern Hemisphere ice sheets induces a northward shift of the westerlies, which causes a rapid eastward sea ice transport and expanded sea ice cover over the subpolar North Atlantic; this expanded sea ice insulates the ocean from heat loss and leads to suppressed deep convection and a weakened AMOC. A sea ice-ocean positive feedback could be further established between the AMOC decrease and sea ice expansion. © 2014. American Geophysical Union. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84907919455&doi=10.1002%2f2014GL060891&partnerID=40&md5=40d25ecde20f014f0b69b654d05b0cd9
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7068
Appears in Collections: 气候减缓与适应
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作者单位: Department of Atmospheric and Oceanic Sciences and Center for Climatic Research, University of Wisconsin-Madison, Madison, WI, United States
Recommended Citation:
Zhu J.,Liu Z.,Zhang X.,et al. Linear weakening of the AMOC in response to receding glacial ice sheets in CCSM3[J]. Geophysical Research Letters,2014-01-01,41(17).