Features of the Equatorial Intermediate Current Associated with Basin Resonance in the Indian Ocean
Huang, K; Han, WQ; Wang, DX; Wang, WQ; Xie, Q; Chen, J; Chen, GX; chengengxin@scsio.ac.cn
2018
发表期刊JOURNAL OF PHYSICAL OCEANOGRAPHY
卷号48期号:6页码:1333-1347
摘要This paper investigates the features of the Equatorial Intermediate Current (EIC) in the Indian Ocean and its relationship with basin resonance at the semiannual time scale by using in situ observations, reanalysis output, and a continuously stratified linear ocean model (LOM). The observational results show that the EIC is characterized by prominent semiannual variations with velocity reversals and westward phase propagation and that it is strongly influenced by the pronounced second baroclinic mode structure but with identifiable vertical phase propagation. Similar behavior is found in the reanalysis data and LOM results. The simulation of wind-driven equatorial wave dynamics in the LOM reveals that the observed variability of the EIC can be largely explained by the equatorial basin resonance at the semiannual period, when the second baroclinic Rossby wave reflected from the eastern boundary intensifies the directly forced equatorial Kelvin and Rossby waves in the basin interior. The sum of the first 10 modes can reproduce the main features of the EIC. Among these modes, the resonant second baroclinic mode makes the largest contribution, which dominates the vertical structure, semiannual cycle, and westward phase propagation of the EIC. The other 9 modes, however, are also important, and the superposition of the first 10 modes produces downward energy propagation in the equatorial Indian Ocean.
部门归属[Huang, Ke; Wang, Dongxiao; Wang, Weiqiang; Xie, Qiang; Chen, Ju; Chen, Gengxin] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Guangdong, Peoples R China; [Han, Weiqing] Univ Colorado, Dept Atmospher & Ocean Sci, Boulder, CO 80309 USA; [Wang, Weiqiang; Xie, Qiang] Qingdao Natl Lab Marine Sci & Technol, Lab Reg Oceanog & Numer Modeling, Qingdao, Peoples R China; [Xie, Qiang] Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya, Peoples R China
学科领域Oceanography
资助项目LTO
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/17067
专题热带海洋环境国家重点实验室(LTO)
通讯作者chengengxin@scsio.ac.cn
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Huang, K,Han, WQ,Wang, DX,et al. Features of the Equatorial Intermediate Current Associated with Basin Resonance in the Indian Ocean[J]. JOURNAL OF PHYSICAL OCEANOGRAPHY,2018,48(6):1333-1347.
APA Huang, K.,Han, WQ.,Wang, DX.,Wang, WQ.,Xie, Q.,...&chengengxin@scsio.ac.cn.(2018).Features of the Equatorial Intermediate Current Associated with Basin Resonance in the Indian Ocean.JOURNAL OF PHYSICAL OCEANOGRAPHY,48(6),1333-1347.
MLA Huang, K,et al."Features of the Equatorial Intermediate Current Associated with Basin Resonance in the Indian Ocean".JOURNAL OF PHYSICAL OCEANOGRAPHY 48.6(2018):1333-1347.
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