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Intraseasonal Variability of the Equatorial Undercurrent in the Indian Ocean
Chen, Gengxin1; Han, Weiqing1; Li, Yuanlong2,3; Yao, Jinglong; Wang, Dongxiao
AbstractBy 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.
KeywordIndian Ocean Kelvin waves Ocean circulation Rossby waves Ocean models Intraseasonal variability
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Document Type期刊论文
Affiliation1.Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Guangdong, Peoples R China
2.Univ Colorado, Dept Atmospher & Ocean Sci, Boulder, CO 80309 USA
3.Chinese Acad Sci, Key Lab Ocean Circulat & Waves, Inst Oceanol, Guangzhou, Guangdong, Peoples R China
4.Qingdao Natl Lab Marine Sci & Technol, Funct Lab Ocean Dynam & Climate, Qingdao, Peoples R China
Recommended Citation
GB/T 7714
Chen, Gengxin,Han, Weiqing,Li, Yuanlong,et al. Intraseasonal Variability of the Equatorial Undercurrent in the Indian Ocean[J]. JOURNAL OF PHYSICAL OCEANOGRAPHY,2019,49(1):85, 101.
APA Chen, Gengxin,Han, Weiqing,Li, Yuanlong,Yao, Jinglong,&Wang, Dongxiao.(2019).Intraseasonal Variability of the Equatorial Undercurrent in the Indian Ocean.JOURNAL OF PHYSICAL OCEANOGRAPHY,49(1),85.
MLA Chen, Gengxin,et al."Intraseasonal Variability of the Equatorial Undercurrent in the Indian Ocean".JOURNAL OF PHYSICAL OCEANOGRAPHY 49.1(2019):85.
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