DOI: 10.1007/s00382-013-1848-z
Scopus记录号: 2-s2.0-84894311378
论文题名: Impact of Mascarene High variability on the East African 'short rains'
作者: Manatsa D. ; Morioka Y. ; Behera S.K. ; Matarira C.H. ; Yamagata T.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2014
卷: 42, 期: 2017-05-06 起始页码: 1259
结束页码: 1274
语种: 英语
英文关键词: Droughts
; East Africa 'short rains'
; Mascarene High eastern ridge
; South East trade winds
; South Indian Ocean
英文摘要: The interannual variability of East African 'short rains' (EASR) and its link with the Mascarene High (MH) variation are explored, using observations and reanalysis data. Correlation and composite analyses for flood and drought events reveal that the EASR variability is strongly linked to the MH zonal displacement, in particular, the zonal movement of the MH eastern ridge. When the MH eastern ridge is anomalously displaced to the west (east) of its normal position, the south east (SE) trade winds over the South Indian Ocean (SIO) anomalously strengthen (weaken). This enhances (reduces) the relatively cool and dry SE trade winds and induces cold (warm) sea surface temperature anomaly in the SIO. As a result, convection over the western equatorial SIO is suppressed (enhanced) and leads to rainfall deficits (excess) over East Africa. Droughts in East Africa are associated with a westward migration of the MH eastern ridge, while the relationship is less clear for flood events and their link to an eastward migration of the MH. Therefore, the zonal migration of the MH eastern ridge provides a novel indicator for the EASR extremes especially droughts. This revelation has immense social application for rainfall forecast over East Africa where rainfall deficits have become more prevalent against the background of deteriorating conventional forecasts for EASR droughts. © 2013 Springer-Verlag Berlin Heidelberg. 资助项目: JSPS, Japan Society for the Promotion of Science London
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54258
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Geography, Bindura University of Science, Bindura, Zimbabwe; Department of Ocean Technology, Policy, and Environment, University of Tokyo, Tokyo, Japan; Research Institute for Global Change, JAMSTEC, Yokohama, Japan; International Center for Theoretical Physics (ICTP), 34151 Trieste, Italy
Recommended Citation:
Manatsa D.,Morioka Y.,Behera S.K.,et al. Impact of Mascarene High variability on the East African 'short rains'[J]. Climate Dynamics,2014-01-01,42(2017-05-06)