DOI: 10.1029/2017JD027149
Scopus记录号: 2-s2.0-85049856487
论文题名: Multicentury Instability of the Atlantic Meridional Circulation in Rapid Warming Simulations With GISS ModelE2
作者: Rind D. ; Schmidt G.A. ; Jonas J. ; Miller R. ; Nazarenko L. ; Kelly M. ; Romanski J.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 12 起始页码: 6331
结束页码: 6355
语种: 英语
英文关键词: abrupt climate change
; climate dynamics
; global warming
; ocean circulation
; paleoclimate
; Younger Dryas
Scopus关键词: air-sea interaction
; climate change
; cooling
; evaporation
; freshwater input
; global warming
; meridional circulation
; North Atlantic Deep Water
; oceanic circulation
; paleoclimate
; precipitation (climatology)
; sea surface salinity
; warming
; Younger Dryas
; Atlantic Ocean
; Atlantic Ocean (North)
英文摘要: In multimillennial global warming simulations with the GISS-E2-R climate model, we observe multicentennial shutdowns with restoration and fast overshooting in North Atlantic Deep Water production despite the absence of exogenous freshwater input. AMOC (Atlantic Meridional Overturning Circulation) cessation is associated with a sea surface salinity reduction, initiated by increases in precipitation over evaporation as the climate warms. These multicentury shutdowns are the direct result of cooling in the North Atlantic associated with an aerosol indirect effect on cloud cover. The local cooling reduces evaporation within the North Atlantic, while warming elsewhere provides moisture to maintain nearly unperturbed precipitation in this region. As global warming continues, warm temperature (low density) anomalies spread northward at depth in the North Atlantic eventually destabilizing the water column, even though precipitation input at the surface is initially unchanged. Internal ocean freshwater transports do not play an important role in initiating this behavior, as assumed by some standard metrics of AMOC stability. The importance of the aerosol indirect effect in these runs is due to its role in strengthening the sea surface temperature-evaporation feedback; this suggests a renewed focus on surface flux observations to help assess overturning stability. The length of the AMOC reduction, and its rapid recovery, may be relevant to the onset and end of the Younger Dryas, which occurred within a warming climate during the last deglaciation. ©2018. American Geophysical Union. All Rights Reserved. This article has been contributed to by US Government employees and their work is in the public domain in the USA. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113677
Appears in Collections: 气候减缓与适应
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作者单位: NASA Goddard Institute for Space Studies, New York, NY, United States; Center for Climate Systems Research, Columbia University, New York, NY, United States; Trinnovim, New York, NY, United States
Recommended Citation:
Rind D.,Schmidt G.A.,Jonas J.,et al. Multicentury Instability of the Atlantic Meridional Circulation in Rapid Warming Simulations With GISS ModelE2[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(12)