DOI: 10.1175/JCLI-D-14-00133.1
Scopus记录号: 2-s2.0-84921696246
论文题名: Local SST impacts on the summertime mascarene high variability
作者: Morioka Y. ; Takaya K. ; Behera S.K. ; Masumoto Y.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2015
卷: 28, 期: 2 起始页码: 678
结束页码: 694
语种: 英语
Scopus关键词: Atmospheric temperature
; Climate change
; Rain
; Surface waters
; Austral summers
; Coupled general circulation models
; Interannual variability
; Interannual variation
; Meridional dipole
; Ocean atmosphere
; Sea surface temperature (SST)
; Southern indian ocean
; Oceanography
; air-sea interaction
; annual variation
; atmospheric moisture
; climate feedback
; rainfall
; sea surface temperature
; summer
; temperature anomaly
; temperature effect
; temperature gradient
; Indian Ocean
; Indian Ocean (South)
; Mascarene Islands
英文摘要: The interannual variations in the summertime Mascarene high have great impacts on the southern African climate as well as the sea surface temperature (SST) in the southern Indian Ocean. A set of coupled general circulation model (CGCM) experiments are performed to examine a role of the interannual SST variability in the southern Indian Ocean on the summertime Mascarene high variability. The dominant interannual variability in the summertime Mascarene high shows the strengthening (weakening) in its southern part throughout the austral summer (December-February). However, in the experiment where the interannual SST variability in the southern Indian Ocean is suppressed, the strengthening (weakening) of the Mascarene high in its southern part does not persist until February. Also, the Mascarene high variability and its associated SST anomalies in December and January are found to increase (decrease) the southern African rainfall via more (less) moisture supply from the southern Indian Ocean. The Mascarene high variability is actually associated with a meridional dipole of positive and negative SST anomalies, which in turn produces that of the meridional SST gradient anomaly. This causes a southward (northward) shift of the storm tracks and hence the westerly jet, favoring the strengthening (weakening) of the Mascarene high in its southern part. This local ocean-atmosphere feedback effectively operates in February, when the meridional dipole of the SST anomalies reaches the maximum. These results provide new insight into the important role of the local SST variability in the summertime Mascarene high variability and hence the southern African climate. © 2015 American Meteorological Society.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50576
Appears in Collections: 气候变化事实与影响
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作者单位: Application Laboratory, Japan Agency for Marine-Earth Science and Technology, Yokohama, Japan; Faculty of Science, Kyoto Sangyo University, Kyoto, Japan; Graduate School of Science, The University of Tokyo, Tokyo, Japan
Recommended Citation:
Morioka Y.,Takaya K.,Behera S.K.,et al. Local SST impacts on the summertime mascarene high variability[J]. Journal of Climate,2015-01-01,28(2)