Intraseasonal Variability of the Equatorial Undercurrent in the Indian Ocean

doi:10.1175/JPO-D-18-0151.1

	Intraseasonal Variability of the Equatorial Undercurrent in the Indian Ocean
	Chen, Gengxin 1,2; Han, Weiqing 2; Li, Yuanlong 3,4; Yao, Jinglong 1; Wang, Dongxiao 1
	2019
发表期刊	JOURNAL OF PHYSICAL OCEANOGRAPHY
ISSN	0022-3670
卷号	49 期号:1 页码:85-101
通讯作者	Wang, Dongxiao([email protected])
摘要	By analyzing in situ observations and conducting a series of ocean general circulation model experiments, this study investigates the physical processes controlling intraseasonal variability (ISV) of the Equatorial Undercurrent (EUC) of the Indian Ocean. ISV of the EUC leads to time-varying water exchanges between the western and eastern equatorial Indian Ocean. For the 2001-14 period, standard deviations of the EUC transport variability are 1.92 and 1.77 Sv (1 Sv 10(6) m(3) s(-1)) in the eastern and western basins, respectively. The ISV of the EUC is predominantly caused by the wind forcing effect of atmospheric intraseasonal oscillations (ISOs) but through dramatically different ocean dynamical processes in the eastern and western basins. The stronger ISV in the eastern basin is dominated by the reflected Rossby waves associated with intraseasonal equatorial zonal wind forcing. It takes 20-30 days to set up an intraseasonal EUC anomaly through the Kelvin and Rossby waves associated with the first and second baroclinic modes. In the western basin, the peak intraseasonal EUC anomaly is generated by the zonal pressure gradient force, which is set up by radiating equatorial Kelvin and Rossby waves induced by the equatorial wind stress. Directly forced and reflected Rossby waves from the eastern basin propagate westward, contributing to intraseasonal zonal current near the surface but having weak impact on the peak ISV of the EUC.
关键词	Indian Ocean Kelvin waves Ocean circulation Rossby waves Ocean models Intraseasonal variability
DOI	10.1175/JPO-D-18-0151.1
收录类别	SCI
语种	英语
资助项目	National Key R&D Program of China[2017YFC1405103]###640; National Key R&D Program of China[XDA 20060502]###641; NSFC[41676010]###37; NSFC[41822602]###642; State Key Laboratory of Tropical Oceanography SCSIO[LTOZZ1702]###39; Youth Innovation Promotion Association CAS[2017397]###40; Guangzhou Science and Technology Foundation[201804010133]###41; National Key R&D Program of China[2017YFC1405103]; National Key R&D Program of China[XDA 20060502]; NSFC[41676010]; NSFC[41822602]; State Key Laboratory of Tropical Oceanography SCSIO[LTOZZ1702]; Youth Innovation Promotion Association CAS[2017397]; Guangzhou Science and Technology Foundation[201804010133]
WOS研究方向	Oceanography
WOS类目	Oceanography
WOS记录号	WOS:000454494400001
出版者	AMER METEOROLOGICAL SOC
引用统计	被引频次：20[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/337002/155920
专题	海洋生态与环境科学重点实验室
通讯作者	Wang, Dongxiao
作者单位	1.Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Guangdong, Peoples R China 2.Univ Colorado, Dept Atmospher & Ocean Sci, Boulder, CO 80309 USA 3.Chinese Acad Sci, Key Lab Ocean Circulat & Waves, Inst Oceanol, Guangzhou, Guangdong, Peoples R China 4.Qingdao Natl Lab Marine Sci & Technol, Funct Lab Ocean Dynam & Climate, Qingdao, Peoples R China
第一作者单位	中国科学院海洋研究所
通讯作者单位	中国科学院海洋研究所
推荐引用方式 GB/T 7714	Chen, Gengxin,Han, Weiqing,Li, Yuanlong,et al. Intraseasonal Variability of the Equatorial Undercurrent in the Indian Ocean[J]. JOURNAL OF PHYSICAL OCEANOGRAPHY,2019,49(1):85-101.
APA	Chen, Gengxin,Han, Weiqing,Li, Yuanlong,Yao, Jinglong,&Wang, Dongxiao.(2019).Intraseasonal Variability of the Equatorial Undercurrent in the Indian Ocean.JOURNAL OF PHYSICAL OCEANOGRAPHY,49(1),85-101.
MLA	Chen, Gengxin,et al."Intraseasonal Variability of the Equatorial Undercurrent in the Indian Ocean".JOURNAL OF PHYSICAL OCEANOGRAPHY 49.1(2019):85-101.