DOI: 10.1007/s00382-011-1165-3
Scopus记录号: 2-s2.0-84859007350
论文题名: Can Indian Ocean SST anomalies influence South American rainfall?
作者: Taschetto A.S. ; Ambrizzi T.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2012
卷: 38, 期: 2017-07-08 起始页码: 1615
结束页码: 1628
语种: 英语
英文关键词: Indian Ocean variability
; Northeast Brazil
; South American climate
; Southern hemisphere teleconnections
英文摘要: In this study we examine the impact of Indian Ocean sea surface temperature (SST) variability on South American circulation using observations and a suite of numerical experiments forced by a combination of Indian and Pacific SST anomalies. Previous studies have shown that the Indian Ocean Dipole (IOD) mode can affect climate over remote regions across the globe, including over South America. Here we show that such a link exists not only with the IOD, but also with the Indian Ocean basin-wide warming (IOBW). The IOBW, a response to El Niño events, tends to reinforce the South American anomalous circulation in March-to-May associated with the warm events in the Pacific. This leads to increased rainfall in the La Plata basin and decreased rainfall over the northern regions of the continent. In addition, the IOBW is suggested to be an important factor for modulating the persistence of dry conditions over northeastern South America during austral autumn. The link between the IOBW and South American climate occurs via alterations of the Walker circulation pattern and through a mid-latitude wave-train teleconnection. © 2011 Springer-Verlag. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/55321
Appears in Collections: 过去全球变化的重建
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作者单位: Climate Change Research Centre, University of New South Wales, Sydney, NSW 2052, Australia; Department of Atmospheric Sciences, University of São Paulo, São Paulo, Brazil
Recommended Citation:
Taschetto A.S.,Ambrizzi T.. Can Indian Ocean SST anomalies influence South American rainfall?[J]. Climate Dynamics,2012-01-01,38(2017-07-08)