DOI: 10.1175/JCLI-D-11-00396.1
Scopus记录号: 2-s2.0-84865192313
论文题名: Subtropical dipole modes simulated in a coupled general circulation model
作者: Morioka Y. ; Tozuka T. ; Masson S. ; Terray P. ; Luo J.-J. ; Yamagata T.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2012
卷: 25, 期: 12 起始页码: 4029
结束页码: 4047
语种: 英语
Scopus关键词: Austral spring
; Coupled general circulation models
; Coupled models
; Decay mechanisms
; Dipole mode
; Dominant mode
; Indian ocean
; Interannual
; Mixed layer
; Observational data
; Rainfall variation
; Sea surface temperature (SST)
; Short-wave radiation
; South Atlantic
; Temperature differences
; Tropical climates
; Rain
; Tropics
; air-sea interaction
; climate variation
; general circulation model
; latent heat flux
; mixed layer
; rainfall
; sea surface temperature
; subtropical region
; warming
; Atlantic Ocean
; Atlantic Ocean (South)
; Indian Ocean
; Indian Ocean (South)
英文摘要: The growth and decay mechanisms of subtropical dipole modes in the southern Indian and South Atlantic Oceans and their impacts on southern African rainfall are investigated using results from a coupled general circulation model originally developed for predicting tropical climate variations. The second (most) dominant mode of interannual sea surface temperature (SST) variations in the southern Indian (South Atlantic) Ocean represents a northeast-southwest oriented dipole, now called subtropical dipole mode. The positive (negative) SST interannual anomaly pole starts to grow in austral spring and reaches its peak in February. In austral late spring, the suppressed (enhanced) latent heat flux loss associated with the variations in the subtropical high causes a thinner (thicker) than normal mixed layer thickness that, in turn, enhances (reduces) the warming of the mixed layer by the climatological shortwave radiation. The positive (negative) pole gradually decays in austral fall because the mixed layer cooling by the entrainment is enhanced (reduced), mostly owing to the larger (smaller) temperature difference between the mixed layer and the entrained water. The increased (decreased) latent heat loss due to the warmer (colder) SST also contributes to the decay of the positive (negative) pole. Although further verification using longer observational data is required, the present coupled model suggests that the South Atlantic subtropical dipole may play a more important role in rainfall variations over the southern African region than the Indian Ocean subtropical dipole. © 2012 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52395
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, Tokyo, Japan; LOCEAN/IPSL, Université Pierre et Marie Curie, Paris, France; Research Institute for Global Change, JAMSTEC, Yokohama, Japan; Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, Tokyo, Japan
Recommended Citation:
Morioka Y.,Tozuka T.,Masson S.,et al. Subtropical dipole modes simulated in a coupled general circulation model[J]. Journal of Climate,2012-01-01,25(12)