DOI: 10.1175/JCLI-D-13-00506.1
Scopus记录号: 2-s2.0-84902095903
论文题名: Role of tropical SST variability on the formation of subtropical dipoles
作者: Morioka Y. ; Masson S. ; Terray P. ; Prodhomme C. ; Behera S.K. ; Masumoto Y.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 12 起始页码: 4486
结束页码: 4507
语种: 英语
Scopus关键词: Atmospheric temperature
; Climate change
; Coastal zones
; Experiments
; Rain
; Sea level
; Antarctic oscillation
; Atmospheric disturbance
; Climate variability
; Coupled general circulation models
; Interannual variation
; Rainfall variability
; Sea surface temperature (SST)
; Southern Hemisphere
; Tropics
; annual variation
; Antarctic Oscillation
; atmosphere-ocean coupling
; climatology
; general circulation model
; rainfall
; Rossby wave
; sea surface temperature
; Southern Hemisphere
; subtropical region
英文摘要: Interannual variations of sea surface temperature (SST) in the midlatitudes of the Southern Hemisphere play an important role in the rainfall variability over the surrounding countries by modulating synoptic-scale atmospheric disturbances. These are frequently associated with a northeast-southwest-oriented dipole of positive and negative SST anomalies in each oceanic basin, referred to as a subtropical dipole. This study investigates the role of tropical SST variability on the generation of subtropical dipoles by conducting SSTnudging experiments using a coupled general circulation model. In the experiments where the simulated SST in each tropical basin is nudged to the climatology of the observed SST, the subtropical dipoles tend to occur as frequently as the case in which the simulated SST is allowed to freely interact with the atmosphere. It is found that without the tropical SST variability, the zonally elongated atmospheric mode in the mid- to high latitudes, called the Antarctic Oscillation (AAO), becomes dominant and the stationary Rossby waves related to the AAO induce the sea level pressure (SLP) anomalies in the midlatitudes, which, in turn, generate the subtropical dipoles. These results suggest that the tropical SST variability may not be necessary for generating the subtropical dipoles, and hence provide a useful insight into the important role of the AAO in the midlatitude climate variability. © 2014 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51394
Appears in Collections: 气候变化事实与影响
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作者单位: Research Institute for Global Change, JAMSTEC, Yokohama, Japan; LOCEAN-IPSL, Université Pierre et Marie Curie, Paris, France
Recommended Citation:
Morioka Y.,Masson S.,Terray P.,et al. Role of tropical SST variability on the formation of subtropical dipoles[J]. Journal of Climate,2014-01-01,27(12)