DOI: 10.1002/2016JD025373
论文题名: Teleconnection between the South Atlantic convergence zone and the southern Indian Ocean: Implications for tropical cyclone activity
作者: DeBlander E. ; Shaman J.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2017
卷: 122, 期: 2 起始页码: 728
结束页码: 740
语种: 英语
英文关键词: Rossby wave
; teleconnections
; tropical cyclones
Scopus关键词: barotropic motion
; convection
; cyclogenesis
; intertropical convergence zone
; precipitation (climatology)
; relative humidity
; Rossby wave
; teleconnection
; tropical cyclone
; tropical meteorology
; wind shear
; Indian Ocean
; Indian Ocean (South)
; South America
英文摘要: A link between anomalous austral summer convection over the South Atlantic convergence zone (SACZ) and atmospheric conditions over the South Indian Ocean is investigated. Interannual north-south shifts in the SACZ produce a dipole of anomalous convection and precipitation over South America. The South Atlantic convergence zone index (SACZI) capturing this variability is presented and associated with a midlatitude Rossby wave train that propagates from South America eastward and south of Africa before curving north into the tropical Indian Ocean. This wave train is reproduced using Rossby wave ray tracing and simulations with a linearized barotropic vorticity equation model forced with divergence and convergence consistent with the observed dipole of anomalous convection. The wave train acts to excite anomalies in wind shear and relative humidity over the tropical south Indian Ocean, which in turn impact tropical cyclone (TC) genesis and distribution over this region. We find that changes in the wind shear and relative humidity associated with the SACZI effect changes in TC genesis, which result in a change in observed TC days over portions of the South Indian Ocean. ©2016. American Geophysical Union. All Rights Reserved. 资助项目: AGS-1205043
; AGS-1303542
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62748
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Salem, OR, United States; Department of Environmental Health Sciences, Columbia University, New York, NY, United States
Recommended Citation:
DeBlander E.,Shaman J.. Teleconnection between the South Atlantic convergence zone and the southern Indian Ocean: Implications for tropical cyclone activity[J]. Journal of Geophysical Research: Atmospheres,2017-01-01,122(2)