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Strong Intraseasonal Variability of Meridional Currents near 5 degrees N in the Eastern Indian Ocean: Characteristics and Causes
Chen, GX; Han, WQ; Li, YL; McPhaden, MJ; Chen, J; Wang, WQ; Wang, DX; dxwang@scsio.ac.cn
2017
Source PublicationJOURNAL OF PHYSICAL OCEANOGRAPHY
Volume47Issue:5Pages:979-998
AbstractThis paper reports on strong, intraseasonal, upper-ocean meridional currents observed in the Indian Ocean between the Bay of Bengal (BOB) and the equator and elucidates the underlying physical processes responsible for them. In situ measurements from a subsurface mooring at 5 degrees N, 90.5 degrees E reveal strong intraseasonal variability of the meridional current with an amplitude of; similar to 0.4 m s(-1) and a typical period of 30-50 days in the upper 150 m, which by far exceeds the magnitudes of the mean flow and seasonal cycle. Such prominent intraseasonal variability is, however, not seen in zonal current at the same location. Further analysis suggests that the observed intraseasonal flows are closely associated with westward-propagating eddylike sea surface height anomalies (SSHAs) along 5 degrees N. The eddylike SSHAs are largely manifestations of symmetric Rossby waves, which result primarily from intraseasonal wind stress forcing in the equatorial waveguide and reflection of the equatorial Kelvin waves at the eastern boundary. Since the wave signals are generally symmetric about the equator, similar variability is also seen at 5 degrees S but with weaker intensity because of the inclined coastline at the eastern boundary. The Rossby waves propagate westward, causing pronounced intraseasonal SSHA and meridional current in the upper ocean across the entire southern BOB between 848 and 94 degrees E. They greatly weaken in the western Indian Basin, but zonal currents near the equator remain relatively strong.
Department[Chen, Gengxin; Chen, Ju; Wang, Weiqiang; Wang, Dongxiao] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Guangdong, Peoples R China; [Chen, Gengxin; Han, Weiqing; Li, Yuanlong] Univ Colorado Boulder, Dept Atmospher & Ocean Sci, Boulder, CO USA; [McPhaden, Michael J.] NOAA, Pacific Marine Environm Lab, 7600 Sand Point Way Ne, Seattle, WA 98115 USA
Funding ProjectLTO
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/16448
Collection热带海洋环境国家重点实验室(LTO)
Corresponding Authordxwang@scsio.ac.cn
Recommended Citation
GB/T 7714
Chen, GX,Han, WQ,Li, YL,et al. Strong Intraseasonal Variability of Meridional Currents near 5 degrees N in the Eastern Indian Ocean: Characteristics and Causes[J]. JOURNAL OF PHYSICAL OCEANOGRAPHY,2017,47(5):979-998.
APA Chen, GX.,Han, WQ.,Li, YL.,McPhaden, MJ.,Chen, J.,...&dxwang@scsio.ac.cn.(2017).Strong Intraseasonal Variability of Meridional Currents near 5 degrees N in the Eastern Indian Ocean: Characteristics and Causes.JOURNAL OF PHYSICAL OCEANOGRAPHY,47(5),979-998.
MLA Chen, GX,et al."Strong Intraseasonal Variability of Meridional Currents near 5 degrees N in the Eastern Indian Ocean: Characteristics and Causes".JOURNAL OF PHYSICAL OCEANOGRAPHY 47.5(2017):979-998.
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