Japan Geoscience Union Meeting 2024

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[J] Oral

A (Atmospheric and Hydrospheric Sciences ) » A-CG Complex & General

[A-CG40] Dynamics of Oceanic and Atmospheric Waves, Vortices, and Circulations

Wed. May 29, 2024 3:30 PM - 4:45 PM 106 (International Conference Hall, Makuhari Messe)

convener:Yohei Onuki(Research Institute for Applied Mechanics, Kyushu University), Yukiharu Hisaki(University of the Ryukyus), Norihiko Sugimoto(Keio University, Department of Physics), Takuro Matsuta(Faculty of Env.Earth Science, Hokkaido University), Chairperson:Yohei Onuki(Research Institute for Applied Mechanics, Kyushu University), Yukiharu Hisaki(University of the Ryukyus), Norihiko Sugimoto(Keio University, Department of Physics), Takuro Matsuta(Faculty of Env.Earth Science, Hokkaido University)

4:00 PM - 4:15 PM

[ACG40-08] Relationship between incoherence of semidiurnal internal tides and Kuroshio Current near the Luzon Strait

*Anzhou Cao1, Zheng Guo2, Shuya Wang3, Jinbao Song1, Xinyu Guo3 (1.Zhejiang Univ., 2.Zhejiang Ocean Univ., 3.Ehime Univ.)

Keywords:Semidiurnal internal tide, Incoherence, Kuroshio Current, Luzon Strait

Internal tides (ITs) are internal waves with tidal frequencies. Under the influence of varying background currents and stratification, ITs often exhibit incoherent features. Based on 9-month-long numerical simulation results, we show the relation between incoherence of semidiurnal ITs and Kuroshio Current near the Luzon Strait (LS) in this study. Results show that the relative variation (standard deviation/mean value) of mode-1 phase speed is an effective indicator for the incoherence of semidiurnal ITs near the LS and it is dominated by the advection term (Doppler shifting). The monthly incoherence of semidiurnal ITs is found to be highly related to the variation of surface kinetic energy of Kuroshio Current near the LS. These results deepen our understanding about the incoherent nature of ITs.