Intraseasonal Variability of the Equatorial Undercurrent in the Indian Ocean

doi:10.1175/JPO-D-18-0151.1

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)

	Intraseasonal Variability of the Equatorial Undercurrent in the Indian Ocean
	Li, Yuanlong 2,4; Chen, Gengxin 3; Han, Weiqing 3; Yao, Jinglong ; Wang, Dongxiao
刊名	JOURNAL OF PHYSICAL OCEANOGRAPHY
	2019
卷号	49 期号:1 页码:85
关键词	Indian Ocean Kelvin waves Ocean circulation Rossby waves Ocean models Intraseasonal variability
ISSN号	0022-3670
DOI	10.1175/JPO-D-18-0151.1
英文摘要	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.
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/17791]
专题	南海海洋研究所_热带海洋环境国家重点实验室(LTO)
作者单位	1.Qingdao Natl Lab Marine Sci & Technol, Funct Lab Ocean Dynam & Climate, Qingdao, Peoples R China 2.Univ Colorado, Dept Atmospher & Ocean Sci, Boulder, CO 80309 USA 3.Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Guangdong, Peoples R China 4.Chinese Acad Sci, Key Lab Ocean Circulat & Waves, Inst Oceanol, Guangzhou, Guangdong, Peoples R China
推荐引用方式 GB/T 7714	Li, Yuanlong,Chen, Gengxin,Han, Weiqing,et al. Intraseasonal Variability of the Equatorial Undercurrent in the Indian Ocean[J]. JOURNAL OF PHYSICAL OCEANOGRAPHY,2019,49(1):85, 101.
APA	Li, Yuanlong,Chen, Gengxin,Han, Weiqing,Yao, Jinglong,&Wang, Dongxiao.(2019).Intraseasonal Variability of the Equatorial Undercurrent in the Indian Ocean.JOURNAL OF PHYSICAL OCEANOGRAPHY,49(1),85.
MLA	Li, Yuanlong,et al."Intraseasonal Variability of the Equatorial Undercurrent in the Indian Ocean".JOURNAL OF PHYSICAL OCEANOGRAPHY 49.1(2019):85.