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Qingwen Zhong, Gengxin Chen, Yuanlong Li, Qihua Peng, Xiaoqing Chu. Intraseasonal variability of the surface zonal current in the equatorial Indian Ocean: Seasonal differences and causes[J]. Acta Oceanologica Sinica. doi: 10.1007/s13131-021-1935-7
Citation: Qingwen Zhong, Gengxin Chen, Yuanlong Li, Qihua Peng, Xiaoqing Chu. Intraseasonal variability of the surface zonal current in the equatorial Indian Ocean: Seasonal differences and causes[J]. Acta Oceanologica Sinica. doi: 10.1007/s13131-021-1935-7

Intraseasonal variability of the surface zonal current in the equatorial Indian Ocean: Seasonal differences and causes

doi: 10.1007/s13131-021-1935-7
Funds:  The National Natural Science Foundation of China under contract Nos 41822602, 41976016 and 4207602; the Strategic Priority Research Program of Chinese Academy of Sciences under contract Nos XDB42000000, XDA20060502 and XDA15020901; the Guangdong Basic and Applied Basic Research Foundation under contract No. 2021A1515011534; the Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory under contract Nos GML2019ZD0302 and GML2019ZD0306; the fund of Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences under contract No. ISEE2021ZD01; the fund of State Key Laboratory of Tropical Oceanography under contract No. LTOZZ2002; the fund of Youth Innovation Promotion Association CAS under contract No. Y2021093.
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  • Corresponding author: E-mail: chuxq@scsio.ac.cn
  • Received Date: 2021-06-29
  • Accepted Date: 2021-09-09
  • Available Online: 2021-10-15
  • Using observations and numerical simulations, this study examines the intraseasonal variability of the surface zonal current (u ISV) over the equatorial Indian Ocean, highlighting the seasonal and spatial differences, and the causes of the differences. Large-amplitude u ISV occurs in the eastern basin at around 80°–90°E and near the western boundary at 45°–55°E. In the eastern basin, the u ISV is mainly caused by the atmospheric intraseasonal oscillations (ISOs), which explains 91% of the standard deviation of the total u ISV. Further analysis suggests that it takes less than ten days for the intraseasonal zonal wind stress to generate the u ISV through the directly forced Kelvin and Rossby waves. Driven by the stronger zonal wind stress associated with the Indian summer monsoon ISO (MISO), the eastern u ISV in boreal summer (May to October) is about 1.5 times larger than that in boreal winter (November to April). In the western basin, both the atmospheric ISOs and the oceanic internal instabilities contribute substantially to the u ISV, and induce stronger u ISV in boreal summer. Energy budget analysis suggests that the mean flow converts energy to the intraseasonal current mainly through barotropic instabilities.
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