DOI: 10.1007/s00382-012-1432-y
Scopus记录号: 2-s2.0-84864385590
论文题名: Decadal-timescale changes of the Atlantic overturning circulation and climate in a coupled climate model with a hybrid-coordinate ocean component
作者: Persechino A. ; Marsh R. ; Sinha B. ; Megann A.P. ; Blaker A.T. ; New A.L.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2012
卷: 39, 期: 3 起始页码: 1021
结束页码: 1042
语种: 英语
英文关键词: Atlantic Meridional Overturning Circulation
; Coupled climate model
; Decadal variability
; Isopycnal
; North Atlantic Oscillation
英文摘要: A wide range of statistical tools is used to investigate the decadal variability of the Atlantic Meridional Overturning Circulation (AMOC) and associated key variables in a climate model (CHIME, Coupled Hadley-Isopycnic Model Experiment), which features a novel ocean component. CHIME is as similar as possible to the 3rd Hadley Centre Coupled Model (HadCM3) with the important exception that its ocean component is based on a hybrid vertical coordinate. Power spectral analysis reveals enhanced AMOC variability for periods in the range 15-30 years. Strong AMOC conditions are associated with: (1) a Sea Surface Temperature (SST) anomaly pattern reminiscent of the Atlantic Multi-decadal Oscillation (AMO) response, but associated with variations in a northern tropical-subtropical gradient; (2) a Surface Air Temperature anomaly pattern closely linked to SST; (3) a positive North Atlantic Oscillation (NAO)-like pattern; (4) a northward shift of the Intertropical Convergence Zone. The primary mode of AMOC variability is associated with decadal changes in the Labrador Sea and the Greenland Iceland Norwegian (GIN) Seas, in both cases linked to the tropical activity about 15 years earlier. These decadal changes are controlled by the low-frequency NAO that may be associated with a rapid atmospheric teleconnection from the tropics to the extratropics. Poleward advection of salinity anomalies in the mixed layer also leads to AMOC changes that are linked to processes in the Labrador Sea. A secondary mode of AMOC variability is associated with interannual changes in the Labrador and GIN Seas, through the impact of the NAO on local surface density. © 2012 Springer-Verlag. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/55212
Appears in Collections: 过去全球变化的重建
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作者单位: Ocean and Earth Science, University of Southampton, European Way, Southampton, Hampshire SO14 3ZH, United Kingdom; National Oceanography Centre, European Way, Southampton, Hampshire SO14 3ZH, United Kingdom
Recommended Citation:
Persechino A.,Marsh R.,Sinha B.,et al. Decadal-timescale changes of the Atlantic overturning circulation and climate in a coupled climate model with a hybrid-coordinate ocean component[J]. Climate Dynamics,2012-01-01,39(3)