DOI: 10.1175/JCLI-D-14-00664.1
Scopus记录号: 2-s2.0-84942920434
论文题名: Does external forcing interfere with the AMOC's influence on North Atlantic sea surface temperature?
作者: Tandon N.F. ; Kushner P.J.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2015
卷: 28, 期: 16 起始页码: 6309
结束页码: 6323
语种: 英语
Scopus关键词: Atmospheric temperature
; Atmospheric thermodynamics
; Climate models
; Digital storage
; Submarine geophysics
; Surface properties
; Surface waters
; Atlantic Ocean
; Atmosphere-ocean interactions
; Coupled models
; Multidecadal variability
; Ocean circulation
; Trends
; Oceanography
; atmosphere-ocean coupling
; climate forcing
; computer simulation
; meridional circulation
; overturn
; sea surface temperature
; trend analysis
; twentieth century
; Atlantic Ocean
; Atlantic Ocean (North)
英文摘要: Numerous studies have suggested that variations in the strength of the Atlantic meridional overturning circulation (AMOC) may drive predictable variations in North Atlantic sea surface temperature (NASST). However, two recent studies have presented results suggesting that coupled models disagree on both the sign and the phasing of the correlation betweenAMOCand NASST indices. These studies analyzed linearly detrended output from twentieth-century historical simulations in phases 3 and 5 of the Coupled Model Intercomparison Project (CMIP3 and CMIP5). The present study argues that the apparent disagreement among models arises from a comingling of two processes: 1) a bottom-up effect in which unforcedAMOCchanges lead to NASST changes of the same sign and 2) a top-down effect in which forced NASST changes lead to AMOC changes of the opposite sign. Linear detrending is not appropriate for separating these two effects because the time scales of forced and unforced variations are not well separated. After forced variations are properly removed, the models come into much closer agreement with each other. This argument is supported by analysis of CMIP5 historical simulations, as well as preindustrial control simulations and a 29-member ensemble of the Community Earth System Model, version 1, covering the period 1920-2005. Additional analysis is presented suggesting that, even after the data are linearly detrended, a significant portion of observed NASST persistence may be externally forced. © 2015 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50528
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Physics, University of Toronto, Toronto, ON, Canada
Recommended Citation:
Tandon N.F.,Kushner P.J.. Does external forcing interfere with the AMOC's influence on North Atlantic sea surface temperature?[J]. Journal of Climate,2015-01-01,28(16)