气候变化领域集成服务门户(CCPortal): Dominant modes of winter precipitation variability over Central Southwest Asia and inter-decadal change in the ENSO teleconnection

CCPortal

DOI	10.1007/s00382-019-04889-9
	Dominant modes of winter precipitation variability over Central Southwest Asia and inter-decadal change in the ENSO teleconnection
	Rana S.; McGregor J.; Renwick J.
发表日期	2019
ISSN	0930-7575
起始页码	5689
结束页码	5707
卷号	53 期号:2020-09-10
英文摘要	This study contributes to an improved understanding of Central Southwest Asia (CSWA) wintertime (November–April) precipitation by analyzing the dominant spatial–temporal modes of the regional winter precipitation and examining their relationship with global sea surface temperature (SST) and large-scale atmospheric circulation fields, for 1950/51–2014/15. Empirical orthogonal function (EOF) analysis results show that the first mode (EOF-1) of winter precipitation is characterized by a mono-sign pattern, with significant links to El Niño-Southern Oscillation (ENSO). EOF-2 displays a north–south dipole related to the latitudinal shift in the jet stream position, while the west–east dipole in EOF-3 appears to be influenced by the thermal contrast between the equatorial regions and higher latitudes. Further, we focus on the interdecadal change of connection between wintertime ENSO and EOF-1 observed around the early 1980s. The relationship is weak during 1950/51–1983/84 (P1), but strong and statistically significant in 1984/85–2014/15 (P2). In P1, without the ENSO signal, EOF-1 related atmospheric circulation anomalies are confined mainly over the mid- to high-latitudes of the Northern Hemisphere, associated with the extratropical East Atlantic–Western Russia (EA–WR) teleconnection. In P2, however, a close connection to the tropical Pacific is observed that includes a pronounced SST expression similar to that of ENSO. As a result of the increased relationship between ENSO and EOF-1 in P2, the regional impact of EA–WR observed over CSWA in P1 is linearly superimposed by the anomalous hemispheric–wide atmospheric response forced by the ENSO conditions in the Pacific. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Atmospheric circulations; Central Southwest Asia; ENSO; Inter-decadal change; Winter precipitation
语种	英语
scopus关键词	air-sea interaction; atmospheric circulation; climate forcing; decadal variation; El Nino-Southern Oscillation; empirical orthogonal function analysis; jet stream; latitude; precipitation (climatology); sea surface temperature; teleconnection; winter; Pacific Ocean; South Asia; West Asia
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/145901
作者单位	School of Geography, Environment and Earth Sciences, Victoria University of Wellington, Wellington, New Zealand
推荐引用方式 GB/T 7714	Rana S.,McGregor J.,Renwick J.. Dominant modes of winter precipitation variability over Central Southwest Asia and inter-decadal change in the ENSO teleconnection[J],2019,53(2020-09-10).
APA	Rana S.,McGregor J.,&Renwick J..(2019).Dominant modes of winter precipitation variability over Central Southwest Asia and inter-decadal change in the ENSO teleconnection.Climate Dynamics,53(2020-09-10).
MLA	Rana S.,et al."Dominant modes of winter precipitation variability over Central Southwest Asia and inter-decadal change in the ENSO teleconnection".Climate Dynamics 53.2020-09-10(2019).