DOI: 10.1007/s00382-016-3162-z
Scopus记录号: 2-s2.0-84969168163
论文题名: Fast and slow responses of Southern Ocean sea surface temperature to SAM in coupled climate models
作者: Kostov Y. ; Marshall J. ; Hausmann U. ; Armour K.C. ; Ferreira D. ; Holland M.M.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2017
卷: 48, 期: 2017-05-06 起始页码: 1595
结束页码: 1609
语种: 英语
英文关键词: Atmosphere–ocean interaction
; CMIP5
; Southern Annular Mode
; Southern Ocean
; Surface westerlies
英文摘要: We investigate how sea surface temperatures (SSTs) around Antarctica respond to the Southern Annular Mode (SAM) on multiple timescales. To that end we examine the relationship between SAM and SST within unperturbed preindustrial control simulations of coupled general circulation models (GCMs) included in the Climate Modeling Intercomparison Project phase 5 (CMIP5). We develop a technique to extract the response of the Southern Ocean SST (55°S–70°S) to a hypothetical step increase in the SAM index. We demonstrate that in many GCMs, the expected SST step response function is nonmonotonic in time. Following a shift to a positive SAM anomaly, an initial cooling regime can transition into surface warming around Antarctica. However, there are large differences across the CMIP5 ensemble. In some models the step response function never changes sign and cooling persists, while in other GCMs the SST anomaly crosses over from negative to positive values only 3 years after a step increase in the SAM. This intermodel diversity can be related to differences in the models’ climatological thermal ocean stratification in the region of seasonal sea ice around Antarctica. Exploiting this relationship, we use observational data for the time-mean meridional and vertical temperature gradients to constrain the real Southern Ocean response to SAM on fast and slow timescales. © 2016, Springer-Verlag Berlin Heidelberg. 资助项目: JSMF, James S. McDonnell Foundation
; OCE, Division of Ocean Sciences
; OCE, Division of Ocean Sciences
; OCE, Division of Ocean Sciences
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53324
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, United States; Clarendon Laboratory, Department of Physics, University of Oxford, Parks Road, Oxford, United Kingdom; Department of Atmospheric Sciences, School of Oceanography, University of Washington, Seattle, WA, United States; Department of Meteorology, University of Reading, P.O. Box 243, Reading, United Kingdom; National Center for Atmospheric Research, Boulder, CO, United States
Recommended Citation:
Kostov Y.,Marshall J.,Hausmann U.,et al. Fast and slow responses of Southern Ocean sea surface temperature to SAM in coupled climate models[J]. Climate Dynamics,2017-01-01,48(2017-05-06)