DOI: 10.1175/JCLI-D-12-00762.1
Scopus记录号: 2-s2.0-84887015803
论文题名: A multimodel study of sea surface temperature and subsurface density fingerprints of the Atlantic meridional overturning circulation
作者: Roberts C.D. ; Garry F.K. ; Jackson L.C.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2013
卷: 26, 期: 22 起始页码: 9155
结束页码: 9174
语种: 英语
Scopus关键词: Climate variability
; Coupled models
; Multidecadal variability
; North Atlantic Ocean
; Oceanic variabilities
; Thermohaline circulations
; Atmospheric temperature
; Climate models
; Oceanography
; carbon dioxide
; climate modeling
; climate variation
; concentration (composition)
; decadal variation
; meridional circulation
; sea surface temperature
; temperature anomaly
; thermohaline circulation
; transport process
; Atlantic Ocean
; Atlantic Ocean (North)
; Labrador Sea
英文摘要: The Atlantic meridional overturning circulation (AMOC) is an important component of the North Atlantic climate system. Here, simulations from 10 coupled climate models are used to calculate patterns of sea surface temperature (SST) and subsurface density change associated with decadal AMOC variability. The models are evaluated using observational constraints and it is shown that all 10 models suffer from North Atlantic Deep Water transports that are too shallow, although the biases are least severe in the Community Climate System Model, version 4 (CCSM4). In the models that best compare with observations, positive AMOC anomalies are associated with reduced Labrador Sea stratification and increased midocean (800-1800 m) densities in the subpolar gyre. Maximum correlations occur when AMOC anomalies lag Labrador Sea stratification and subsurface density anomalies by 2-6 yr and 0-3 yr, respectively. In all 10 models, North Atlantic warming follows positive AMOC anomalies, but the patterns and magnitudes of SST change are variable. A simple detection and attribution analysis is then used to evaluate the utility of Atlantic midocean density and Labrador Sea stratification indices for detecting changes to the AMOC in the presence of increasing CO2 concentrations. It is shown that trends in midocean density are identifiable (although not attributable) significantly earlier than trends in the AMOC. For this reason, subsurface density observations could be a useful complement to transport observations made at specific latitudes and may help with the more rapid diagnosis of basin-scale changes in the AMOC. Using existing observations, it is not yet possible to detect a robust trend in the AMOC using either midocean densities or transport observations from 26.5°N. © 2013 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51564
Appears in Collections: 气候变化事实与影响
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作者单位: Met Office Hadley Centre, Exeter, United Kingdom; Ocean and Earth Science, University of Southampton, Southampton, United Kingdom
Recommended Citation:
Roberts C.D.,Garry F.K.,Jackson L.C.. A multimodel study of sea surface temperature and subsurface density fingerprints of the Atlantic meridional overturning circulation[J]. Journal of Climate,2013-01-01,26(22)