4.7 Article

Impact of Tropical Cyclones on Geostrophic Velocity of the Western Boundary Current

期刊

GEOPHYSICAL RESEARCH LETTERS
卷 48, 期 18, 页码 -

出版社

AMER GEOPHYSICAL UNION
DOI: 10.1029/2021GL094355

关键词

tropical cyclone; geostrophic velocity; Kuroshio; western boundary current; TC-driven upwelling; ocean heat uptake

资金

  1. Ministry of Oceans and Fisheries, Korea [20170355]
  2. in-house project of KIOST
  3. [20190344]

向作者/读者索取更多资源

The study reveals that tropical cyclones have a direct impact on the surface geostrophic velocity of the Kuroshio in the western North Pacific, reducing it by 14 cm s(-1) for a month. The decrease in velocity is mainly attributed to the TC-driven upwelling, while the effect of ocean heat uptake after the TC is minor.
Tropical cyclones (TC), which are among the most destructive natural phenomena on Earth, have significant impacts on the western boundary current (WBC). We quantify the direct impact of TCs on the surface geostrophic velocity of the Kuroshio, the WBC in the western North Pacific, by analyzing satellite-derived geostrophic current data and using results from theoretical and numerical models. The study reveals that TCs decrease the surface geostrophic velocity by 14 cm s(-1) which is 16% of the mean velocity of the Kuroshio (85 cm s(-1)), with the reduced velocity maintained for a month. The decrease in velocity of the Kuroshio is mainly (87%) due to the effect of TC-driven upwelling (Cooling effect), the effect of ocean heat uptake after the TC (Warming effect) being minor (13%); these are basically enabled by the strong thermal gradient around the Kuroshio.

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