Eastward Shift of Interannual Climate Variability in the South Indian Ocean since 1950

doi:10.1175/JCLI-D-21-0356.1

IOCAS-IR > 海洋环流与波动重点实验室

	Eastward Shift of Interannual Climate Variability in the South Indian Ocean since 1950
	Zhang, Lei 1; Han, Weiqing 1; Karnauskas, Kristopher B.1,2; Li, Yuanlong 1,3,4; Tozuka, Tomoki 5
	2022
发表期刊	JOURNAL OF CLIMATE
ISSN	0894-8755
卷号	35 期号:2 页码:561-575
通讯作者	Zhang, Lei(lezh8230@colorado.edu)
摘要	The subtropical Indian Ocean dipole (SIOD) and Ningaloo Nino are the two dominant modes of interannual climate variability in the subtropical south Indian Ocean. Observations show that the SIOD has been weakening in the recent decades, while Ningaloo Nino has been strengthening. In this study, we investigate the causes for such changes by analyzing climate model experiments using the NCAR Community Earth System Model, version 1 (CESM1). Ensemble-mean results from CESM1 large-ensemble (CESM1-LE) show that the external forcing causes negligible changes in the amplitudes of the SIOD and Ningaloo Nino, suggesting a dominant role of internal climate variability. Meanwhile, results from CESM1 pacemaker experiments reveal that the observed changes in the two climate modes cannot be attributed to the effect of sea surface temperature anomalies (SSTA) in either the eastern tropical Pacific Ocean or tropical Indian Ocean. By further comparing different ensemble members from the CESM1-LE, we find that a warm pool dipole mode of decadal variability, with opposite SSTA in the southeast Indian Ocean and the western-central tropical Pacific Ocean plays an important role in driving the observed changes in the SIOD and Ningaloo Nino. These changes in the two climate modes have considerable impacts on precipitation and sea level variabilities in the south Indian Ocean region.
关键词	Indian Ocean Climate variability Tropical variability
DOI	10.1175/JCLI-D-21-0356.1
收录类别	SCI
语种	英语
资助项目	NSF AGS[1935279] ; NSF AGS[NSF OCE 1658132] ; National Key R&D Program of China[2019YFA0606702] ; Shandong Provincial Natural Science Foundation[ZR2020JQ17] ; National Science Foundation
WOS研究方向	Meteorology & Atmospheric Sciences
WOS类目	Meteorology & Atmospheric Sciences
WOS记录号	WOS:000799188000007
出版者	AMER METEOROLOGICAL SOC
引用统计	被引频次：1[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/179417
专题	海洋环流与波动重点实验室
通讯作者	Zhang, Lei
作者单位	1.Univ Colorado, Dept Atmospher & Ocean Sci, Boulder, CO 80309 USA 2.Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO USA 3.Chinese Acad Sci, CAS Key Lab Ocean Circulat & Waves, Inst Oceanol, Qingdao, Peoples R China 4.Chinese Acad Sci, Ctr Ocean Megasci, Qingdao, Peoples R China 5.Univ Tokyo, Grad Sch Sci, Dept Earth & Planetary Sci, Tokyo, Japan
推荐引用方式 GB/T 7714	Zhang, Lei,Han, Weiqing,Karnauskas, Kristopher B.,et al. Eastward Shift of Interannual Climate Variability in the South Indian Ocean since 1950[J]. JOURNAL OF CLIMATE,2022,35(2):561-575.
APA	Zhang, Lei,Han, Weiqing,Karnauskas, Kristopher B.,Li, Yuanlong,&Tozuka, Tomoki.(2022).Eastward Shift of Interannual Climate Variability in the South Indian Ocean since 1950.JOURNAL OF CLIMATE,35(2),561-575.
MLA	Zhang, Lei,et al."Eastward Shift of Interannual Climate Variability in the South Indian Ocean since 1950".JOURNAL OF CLIMATE 35.2(2022):561-575.

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