DOI: 10.1007/s00382-012-1586-7
Scopus记录号: 2-s2.0-84875706338
论文题名: Multi-centennial variability controlled by Southern Ocean convection in the Kiel Climate Model
作者: Martin T. ; Park W. ; Latif M.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2013
卷: 40, 期: 2017-07-08 起始页码: 2005
结束页码: 2022
语种: 英语
英文关键词: Coupled climate model
; Deep convection
; Multi-centennial climate variability
; Southern Ocean
; Weddell Polynya
英文摘要: A quasi-oscillatory multi-centennial mode of open ocean deep convection in the Atlantic sector of the Southern Ocean in the Kiel Climate Model is described. The quasi-periodic occurrence of the deep convection causes variations in regional and global surface air temperature, Southern Hemisphere sea ice coverage, Southern Ocean and North Atlantic sea surface height, the Antarctic Circumpolar Current and the Atlantic Meridional Overturning Circulation (AMOC). The deep convection is stimulated by a strong built-up of heat at mid-depth. When the heat reservoir is virtually depleted a coincidental strong freshening event at the sea surface shuts down the convection. The heat originates from relatively warm deep water formed in the North Atlantic. The several decades lasting recharge process of the heat reservoir depends on the AMOC and the Weddell Gyre and sets a minimum delay for the deep convection to recur. While the strength of the AMOC increases, the Weddell Gyre weakens during the non-convective regime. Convection onset and shutdown also depend on the stochastic occurrence of favorable sea surface conditions, which contributes to the multi-centennial period of the phenomenon. The shutdown triggers a century-long deviation in AMOC strength caused by significant reductions in bottom water formation and surface salinity in the Southern Ocean's Atlantic sector. Additional numerical experimentation reveals that sea ice has an important effect on the frequency of occurrence and intensity of the deep convection. Further, we find intriguing similarities to the Weddell Polynya observed during the 1970s. © 2012 Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/55050
Appears in Collections: 过去全球变化的重建
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作者单位: Helmholtz Centre for Ocean Research Kiel (GEOMAR), Düsternbrooker Weg 20, 24105 Kiel, Germany; Applied Physics Laboratory, Polar Science Center, University of Washington, 1013 NE 40th St, Seattle, WA 98105, United States
Recommended Citation:
Martin T.,Park W.,Latif M.. Multi-centennial variability controlled by Southern Ocean convection in the Kiel Climate Model[J]. Climate Dynamics,2013-01-01,40(2017-07-08)