DOI: 10.1175/JCLI-D-13-00431.1
Scopus记录号: 2-s2.0-84900415894
论文题名: Remote effects of El Niño and Modoki events on the austral summer precipitation of Southern Africa
作者: Ratnam J.V. ; Behera S.K. ; Masumoto Y. ; Yamagata T.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 10 起始页码: 3802
结束页码: 3815
语种: 英语
Scopus关键词: Troposphere
; Atmospheric teleconnections
; Composite analysis
; Equatorial Pacific
; Precipitation anomalies
; Rossby wave activity
; Sea surface temperature anomalies
; South Indian Ocean
; Stationary waves
; Oceanography
; anticyclone
; El Nino
; precipitation (climatology)
; Rossby wave
; sea surface temperature
; spatial distribution
; standing wave
; summer
; teleconnection
; temperature anomaly
; troposphere
; wind
; Indian Ocean
; Indian Ocean (South)
; Pacific Ocean
; Pacific Ocean (Equatorial)
; Southern Africa
英文摘要: Remote effects modulating the austral summer precipitation over southern Africa during El Niño/El Niño Modoki events are investigated by analyzing the observed events during December-February of the years from 1982/83 to 2010/11. Based on the composite analyses, it is found that southern Africa experiences significantly below normal precipitation during El Niño events compared to El Niño Modoki events. During these latter events, precipitation anomalies are not so significant although southern Africa as a whole receives below normal precipitations. The differences in the spatial distribution of precipitation over southern Africa are seen to be related to the sea surface temperature (SST) anomalies of the equatorial Pacific through atmospheric teleconnections. The low-level (850 hPa) Matsuno-Gill response to anomalously high precipitation over the Pacific during El Niño events results in an anomalous anticyclone extending from the equatorial to the subtropical South Indian Ocean. These anomalous anticyclonic winds weaken the tropical moisture flow into the southern Africa landmass. Rossby wave activity flux analysis of the upper-level (300 hPa) circulation shows an anomalous tropospheric stationary wave from the Pacific propagating toward southern Africa and maintaining an anomalous anticyclone over southern Africa. The anomalous Matsuno-Gill response and the anomalous tropospheric stationary wave response are intense during El Niño events, causing drought over southern Africa. During El Niño Modoki events, these processes are weaker compared to El Niño events. © 2014 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51201
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; Application Laboratory, JAMSTEC, Yokohama, Japan; School of Science, The University of Tokyo, Tokyo, Japan
Recommended Citation:
Ratnam J.V.,Behera S.K.,Masumoto Y.,et al. Remote effects of El Niño and Modoki events on the austral summer precipitation of Southern Africa[J]. Journal of Climate,2014-01-01,27(10)