Impacts of the Indian Ocean Dipole on Sea Level and Gyre Circulation of the Western Tropical Pacific Ocean

doi:10.1175/JCLI-D-19-0782.1

IOCAS-IR > 海洋环流与波动重点实验室

	Impacts of the Indian Ocean Dipole on Sea Level and Gyre Circulation of the Western Tropical Pacific Ocean
	Duan, Jing 1,2,3; Li, Yuanlong 1,2,3; Zhang, Lei 4; Wang, Fan1,2,3
	2020-05-01
发表期刊	JOURNAL OF CLIMATE
ISSN	0894-8755
卷号	33 期号:10 页码:4207-4228
通讯作者	Li, Yuanlong(liyuanlong@qdio.ac.cn)
摘要	Interannual variabilities of sea level and upper-ocean gyre circulation of the western tropical Pacific Ocean (WTPO) have been predominantly attributed to El Nino-Southern Oscillation (ENSO). The results of the present study put forward important modulation effects by the Indian Ocean dipole (IOD) mode. The observed sea level in the WTPO shows significant instantaneous and lagged correlations (around -0.60 and 0.40, respectively) with the IOD mode index (DMI). A composite of 14 "independent" IOD events for 1958-2017 shows negative sea level anomalies (SLAs) of 4-7 cm in the WTPO during positive IOD events and positive SLAs of 6-8 cm in the following year that are opposite in sign to the El Nino effect. The IOD impacts are reproduced by large-ensemble simulations of a climate model that generate respectively 430 and 519 positive and negative independent IOD events. A positive IOD induces westerly winds over the western and central tropical Pacific and causes negative SLAs through Ekman upwelling, and it facilitates the establishment of a La Nina condition in the following year that involves enhanced Pacific trade winds and causes positive SLAs in the WTPO. Ocean model experiments confirm that the IOD affects the WTPO sea level mainly through modulating the tropical Pacific winds. Variability of the Indonesian Throughflow (ITF) induced by IOD winds has a relatively weak effect on the WTPO. The IOD's impacts on the major upper-ocean currents are also considerable, causing anomalies of 1-4 Sv (1 Sv equivalent to 10(6) m(3) s(-1)) in the South Equatorial Current (SEC) and North Equatorial Countercurrent (NECC) volume transports.
关键词	Indian Ocean Ocean circulation Sea level
DOI	10.1175/JCLI-D-19-0782.1
收录类别	SCI
语种	英语
资助项目	National Key R&D Program of China[2019YFA0606702] ; Natural Science Foundation of China[41730534] ; Natural Science Foundation of China[41806014] ; Natural Science Foundation of China[41776001] ; Natural Science Foundation of China[41806001]
WOS研究方向	Meteorology & Atmospheric Sciences
WOS类目	Meteorology & Atmospheric Sciences
WOS记录号	WOS:000565177600004
出版者	AMER METEOROLOGICAL SOC
引用统计	被引频次：17[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/337002/168472
专题	海洋环流与波动重点实验室
通讯作者	Li, Yuanlong
作者单位	1.Chinese Acad Sci, Key Lab Ocean Circulat & Waves, Inst Oceanol, Qingdao, Peoples R China 2.Chinese Acad Sci, Funct Lab Ocean Dynam & Climate, Qingdao Natl Lab Marine Sci & Technol, Qingdao, Peoples R China 3.Chinese Acad Sci, Ctr Ocean Mega Sci, Qingdao, Peoples R China 4.Univ Colorado, Dept Atmospher & Ocean Sci, Boulder, CO 80309 USA
第一作者单位	海洋环流与波动重点实验室
通讯作者单位	海洋环流与波动重点实验室
推荐引用方式 GB/T 7714	Duan, Jing,Li, Yuanlong,Zhang, Lei,et al. Impacts of the Indian Ocean Dipole on Sea Level and Gyre Circulation of the Western Tropical Pacific Ocean[J]. JOURNAL OF CLIMATE,2020,33(10):4207-4228.
APA	Duan, Jing,Li, Yuanlong,Zhang, Lei,&Wang, Fan.(2020).Impacts of the Indian Ocean Dipole on Sea Level and Gyre Circulation of the Western Tropical Pacific Ocean.JOURNAL OF CLIMATE,33(10),4207-4228.
MLA	Duan, Jing,et al."Impacts of the Indian Ocean Dipole on Sea Level and Gyre Circulation of the Western Tropical Pacific Ocean".JOURNAL OF CLIMATE 33.10(2020):4207-4228.

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