DOI: 10.1007/s00382-014-2414-z
Scopus记录号: 2-s2.0-84941417175
论文题名: El Niño–Southern Oscillation diversity and Southern Africa teleconnections during Austral Summer
作者: Hoell A. ; Funk C. ; Magadzire T. ; Zinke J. ; Husak G.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2015
卷: 45, 期: 2017-05-06 起始页码: 1583
结束页码: 1599
语种: 英语
英文关键词: El Niño
; ENSO Diversity
; La Niña
; Southern Africa
; Teleconnections
英文摘要: A wide range of sea surface temperature (SST) expressions have been observed during the El Niño–Southern Oscillation events of 1950–2010, which have occurred simultaneously with different global atmospheric circulations. This study examines the atmospheric circulation and precipitation during December–March 1950–2010 over the African Continent south of 15∘S, a region hereafter known as Southern Africa, associated with eight tropical Pacific SST expressions characteristic of El Niño and La Niña events. The self-organizing map method along with a statistical distinguishability test was used to isolate the SST expressions of El Niño and La Niña. The seasonal precipitation forcing over Southern Africa associated with the eight SST expressions was investigated in terms of the horizontal winds, moisture budget and vertical motion. El Niño events, with warm SST across the east and central Pacific Ocean and warmer than average SST over the Indian Ocean, are associated with precipitation reductions over Southern Africa. The regional precipitation reductions are forced primarily by large-scale mid-tropospheric subsidence associated with anticyclonic circulation in the upper troposphere. El Niño events with cooler than average SST over the Indian Ocean are associated with precipitation increases over Southern Africa associated with lower tropospheric cyclonic circulation and mid-tropospheric ascent. La Niña events, with cool SST anomalies over the central Pacific and warm SST over the west Pacific and Indian Ocean, are associated with precipitation increases over Southern Africa. The regional precipitation increases are forced primarily by lower tropospheric cyclonic circulation, resulting in mid-tropospheric ascent and an increased flux of moisture into the region. © 2014, Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54019
Appears in Collections: 过去全球变化的重建
There are no files associated with this item.
作者单位: Department of Geography, University of California Santa Barbara, Santa Barbara, CA, United States; U.S. Geological Survey, Department of Geography, University of California Santa Barbara, Santa Barbara, CA, United States; Famine Early Warning Systems Network, Gaborone, South Africa; University of Western Australia, Perth, Australia
Recommended Citation:
Hoell A.,Funk C.,Magadzire T.,et al. El Niño–Southern Oscillation diversity and Southern Africa teleconnections during Austral Summer[J]. Climate Dynamics,2015-01-01,45(2017-05-06)