Semiannual Variability of Middepth Zonal Currents along 5 degrees N in the Eastern Indian Ocean: Characteristics and Causes
文献类型：期刊论文
| 作者 | Huang, Ke4; Wang, Dongxiao5; Han, Weiqing6; Feng, Ming1; Chen, Gengxin4; Wang, Weiqiang3; Chen, Ju; Li, Jian; chengengxin@scsio.ac.cn |
| 刊名 | JOURNAL OF PHYSICAL OCEANOGRAPHY
 |
| 出版日期 | 2019 |
| 卷号 | 49期号:10页码:2715 |
| 关键词 | Dynamics Kelvin waves Large-scale motions Ocean circulation Ocean dynamics Rossby waves |
| DOI | 10.1175/JPO-D-19-0089.1 |
| 英文摘要 | Four-year (2014-17) zonal current data observed by a mooring at (5 degrees N, 90.5 degrees E) in the eastern Indian Ocean show a strong semiannual cycle in the middepth (similar to 1200 m) with distinct vertical structure. This pronounced middepth semiannual variability, however, is inconsistent with the local wind forcing, which shows a predominant annual cycle. The underlying causes for this unique middepth variability along 5 degrees N were elucidated with the addition of a reanalysis product and a continuously stratified linear ocean model. The results suggest that the observed seasonal variability in the middepth zonal flow at 5 degrees N is primarily caused by boundary-reflected Rossby waves forced by the remote semiannual winds along the equator. Contribution from the locally wind-forced Rossby waves is much less. The theoretical Wentzel-Kramers-Brillouin ray paths further verify that the strong semiannual variability of the middepth signals over a moored region in the eastern Indian Ocean is largely a manifestation of the steep angles of propagating energy of the long Rossby waves at semiannual time scale. The annual signals are only significant in the upper and western sections (75 degrees-80 degrees E) as a result of the smooth trajectories of Rossby waves forced by local annual winds. Further analysis reveals that the middepth zonal currents along 5 degrees N are expected to be associated with equatorial symmetric Rossby waves at semiannual period. Consequently, similar zonal flows should also exist in the middepth near 5 degrees S. |
| 资助机构 | Strategic Priority Research Program of Chinese Academy of SciencesChinese Academy of Sciences [XDA20060502, 2017YFC1405100, 2017YFB0502700, 2016YFC1401401]; Innovative Research Group of National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [41521005]; NSFCNational Natural Science Foundation of China (NSFC) [41822602, 41706027, 41676010, 41676013]; GNSF [2016A030310015, DY135-E2-4-02, LTOZZ1802, LTOZZ1702, LTO1803]; Youth Innovation Promotion Association CAS [2017397]; Guangzhou Science and Technology Foundation [201804010133]; Opening Project of Key Laboratory of Marine Environmental Information Technology, State Oceanic Administration of China; [NHXX2018WL0101]; [GML2019ZD0306] ; Strategic Priority Research Program of Chinese Academy of SciencesChinese Academy of Sciences [XDA20060502, 2017YFC1405100, 2017YFB0502700, 2016YFC1401401]; Innovative Research Group of National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [41521005]; NSFCNational Natural Science Foundation of China (NSFC) [41822602, 41706027, 41676010, 41676013]; GNSF [2016A030310015, DY135-E2-4-02, LTOZZ1802, LTOZZ1702, LTO1803]; Youth Innovation Promotion Association CAS [2017397]; Guangzhou Science and Technology Foundation [201804010133]; Opening Project of Key Laboratory of Marine Environmental Information Technology, State Oceanic Administration of China; [NHXX2018WL0101]; [GML2019ZD0306] |
| 源URL | [http://ir.scsio.ac.cn/handle/344004/18218]  |
| 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.Univ Colorado, Dept Atmospher & Ocean Sci, Boulder, CO 80309 USA 2.Qingdao Natl Lab Marine Sci & Technol, Lab Reg Oceanog & Numer Modeling, Qingdao, Shandong, Peoples R China 3.CSIRO Oceans & Atmosphere, Crawley, WA, Australia 4.Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Guangdong, Peoples R China 5.Southern Marine Sci & Engn Guangdong Lab Ghuangzh, Guangzhou, Guangdong, Peoples R China 6.Sun Yat Sen Univ, Sch Marine Sci, Guangzhou, Guangdong, Peoples R China |
| 推荐引用方式 GB/T 7714 | Huang, Ke,Wang, Dongxiao,Han, Weiqing,et al. Semiannual Variability of Middepth Zonal Currents along 5 degrees N in the Eastern Indian Ocean: Characteristics and Causes[J]. JOURNAL OF PHYSICAL OCEANOGRAPHY,2019,49(10):2715, 2729. |
| APA | Huang, Ke.,Wang, Dongxiao.,Han, Weiqing.,Feng, Ming.,Chen, Gengxin.,...&chengengxin@scsio.ac.cn.(2019).Semiannual Variability of Middepth Zonal Currents along 5 degrees N in the Eastern Indian Ocean: Characteristics and Causes.JOURNAL OF PHYSICAL OCEANOGRAPHY,49(10),2715. |
| MLA | Huang, Ke,et al."Semiannual Variability of Middepth Zonal Currents along 5 degrees N in the Eastern Indian Ocean: Characteristics and Causes".JOURNAL OF PHYSICAL OCEANOGRAPHY 49.10(2019):2715. |
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来源：南海海洋研究所
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