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Vertical Propagation of Middepth Zonal Currents Associated With Surface Wind Forcing in the Equatorial Indian Ocean
Huang, Ke; McPhaden, Michael J.; Wang, Dongxiao2; Wang, Weiqiang3; Xie, Qiang3,4; Chen, Ju; Shu, Yeqiang; Wang, Qiang; Li, Jian; Yao, Jinglong
2018
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
ISSN2169-9275
Volume123Issue:10Pages:7290
AbstractThe vertical propagation of middepth (200-1,500m) zonal velocity in the equatorial Indian Ocean (EIO) and its relationship with surface wind forcing are investigated. We focus on semiannual time scales, using in situ mooring observations and an oceanic reanalysis product that can reasonably well reproduce the structure and magnitude of the observed middepth zonal velocity in the EIO. The pronounced semiannual cycle in observed middepth zonal currents indicates a clear upward phase propagation with particularly robust signatures at depths of 500-1,000m between 3 degrees S to 3 degrees N, 70 to 85 degrees E. The main characteristics of the middepth currents are consistent with vertically propagating first-meridional-mode Rossby wave at semiannual period. Theory suggests that equatorial Kelvin waves, forced by zonal wind variations in the western half of the basin, transfer energy downward and eastward, reflecting into Rossby waves at the eastern boundary. These reflected Rossby waves transfer energy downward and westward, contributing greatly to observed phase propagation at middepths in the EIO.
DepartmentLTO
Keywordmiddepth zonal current vertical propagation wind-driven equatorial waves energy ray equatorial Indian Ocean
DOI10.1029/2018JC013977
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Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/17562
Collection热带海洋环境国家重点实验室(LTO)
Affiliation1.Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Guangdong, Peoples R China
2.McPhaden, Michael J.] NOAA, Pacific Marine Environm Lab, 7600 Sand Point Way Ne, Seattle, WA 98115 USA
3.Sun Yat Sen Univ, Sch Marine Sci, Guangzhou, Guangdong, Peoples R China
4.Qingdao Natl Lab Marine Sci & Technol, Lab Reg Oceanog & Numer Modeling, Qingdao, Peoples R China
5.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya, Peoples R China
Recommended Citation
GB/T 7714
Huang, Ke,McPhaden, Michael J.,Wang, Dongxiao,et al. Vertical Propagation of Middepth Zonal Currents Associated With Surface Wind Forcing in the Equatorial Indian Ocean[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2018,123(10):7290, 7307.
APA Huang, Ke.,McPhaden, Michael J..,Wang, Dongxiao.,Wang, Weiqiang.,Xie, Qiang.,...&Yao, Jinglong.(2018).Vertical Propagation of Middepth Zonal Currents Associated With Surface Wind Forcing in the Equatorial Indian Ocean.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,123(10),7290.
MLA Huang, Ke,et al."Vertical Propagation of Middepth Zonal Currents Associated With Surface Wind Forcing in the Equatorial Indian Ocean".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 123.10(2018):7290.
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