Decadal Shift in El Nino Influences on Indo-Western Pacific and East Asian Climate in the 1970s

CORC > 南海海洋研究所 > 中国科学院南海海洋研究所 > 热带海洋环境国家重点实验室(LTO)

	Decadal Shift in El Nino Influences on Indo-Western Pacific and East Asian Climate in the 1970s
	Xie, SP ; Du, Y ; Huang, G ; Zheng, XT ; Tokinaga, H ; Hu, KM ; Liu, QY
刊名	JOURNAL OF CLIMATE
	2010
卷号	23 期号:12 页码:3352-3368
ISSN号	0894-8755
通讯作者	xie@hawaii.edu
中文摘要	El Nino's influence on the subtropical northwest (NW) Pacific climate increased after the climate regime shift of the 1970s. This is manifested in well-organized atmospheric anomalies of suppressed convection and a surface anticyclone during the summer (June August) of the El Nino decay year [RAW], a season when equatorial Pacific sea surface temperature (SST) anomalies have dissipated. In situ observations and ocean atmospheric reanalyses are used to investigate mechanisms for the interdecadal change. During JJA(1), the influence of the El Nino Southern Oscillation (ENSO) on the NW Pacific is indirect, being mediated by SST conditions over the tropical Indian Ocean (TIO). The results here show that interdecadal change in this influence is due to changes in the TIO response to ENSO. During the postregime shift epoch, the El Nino teleconnection excites downwelling Rossby waves in the south 110 by anticyclonic wind curls. These Rossby waves propagate slowly westward, causing persistent SST warming over the thermocline ridge in the southwest TIO. The ocean warming induces an antisymmetric wind pattern across the equator, and the anomalous northeasterlies cause the north Indian Ocean to warm through JJA(1) by reducing the southwesterly monsoon winds. The TIO warming excites a warm Kelvin wave in tropospheric temperature, resulting in robust atmospheric anomalies over the NW Pacific that include the surface anticyclone. During the preregime shift epoch, ENSO is significantly weaker in variance and decays earlier than during the recent epoch. Compared to the epoch after the mid-1970s, SST and wind anomalies over the TIO are similar during the developing and mature phases of ENSO but are very weak during the decay phase. Specifically, the southern TIO Rossby waves are weaker, so are the antisymmetric wind pattern and the North Indian Ocean warming during JJA(1). Without the anchor in the TIO warming, atmospheric anomalies over the NW Pacific fail to develop during JJA(1) prior to the mid-1970s. The relationship of the interdecadal change to global warming and implications for the East Asian summer monsoon are discussed.
学科主题	Meteorology & Atmospheric Sciences
收录类别	SCI
原文出处	AMER METEOROLOGICAL SOC
WOS记录号	WOS:000279785900011
公开日期	2011-07-03
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/6275]
专题	南海海洋研究所_热带海洋环境国家重点实验室(LTO)
推荐引用方式 GB/T 7714	Xie, SP,Du, Y,Huang, G,et al. Decadal Shift in El Nino Influences on Indo-Western Pacific and East Asian Climate in the 1970s[J]. JOURNAL OF CLIMATE,2010,23(12):3352-3368.
APA	Xie, SP.,Du, Y.,Huang, G.,Zheng, XT.,Tokinaga, H.,...&Liu, QY.(2010).Decadal Shift in El Nino Influences on Indo-Western Pacific and East Asian Climate in the 1970s.JOURNAL OF CLIMATE,23(12),3352-3368.
MLA	Xie, SP,et al."Decadal Shift in El Nino Influences on Indo-Western Pacific and East Asian Climate in the 1970s".JOURNAL OF CLIMATE 23.12(2010):3352-3368.