Japan Geoscience Union Meeting 2024

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[J] Oral

A (Atmospheric and Hydrospheric Sciences ) » A-OS Ocean Sciences & Ocean Environment

[A-OS16] Coastal ocean circulation and material cycle

Mon. May 27, 2024 3:30 PM - 4:45 PM 106 (International Conference Hall, Makuhari Messe)

convener:Eiji Masunaga(Ibaraki University), Mitsuko Hidaka(Japan Agency for Marine-Earth Science and Technology ), Anne Takahashi(Atmosphere and Ocean Research Institute, The University of Tokyo), Toshimi Nakajima(Atmosphere and Ocean Research Institute, The University of Tokyo), Chairperson:Eiji Masunaga(Ibaraki University), Anne Takahashi(Atmosphere and Ocean Research Institute, The University of Tokyo)

3:45 PM - 4:00 PM

[AOS16-07] Occurrence of marine heatwaves in the Kyushu region

*Daiki Koga1, Shinichiro Kida2 (1. Department of Earth System Science, Interdisciplinary Graduate School of Engineering Science, Kyushu University,, 2.Research Institute for Applied Mechanics, Kyushu University)

Keywords:Marine hwatwave, Kurosio Current, Tsushima Warm Current

Marine heatwave (MHW) is an event of anomalous warm sea surface temperatures (SST) from several days to years.The frequency of MHW has increased significantly over the past 100 years and can have a major impact on marine ecosystems.The occurrence of MHW has been investigated intensively over recent years, but mostly on basin scales and coastal areas have not been fully examined yet.In this study, we will examine the frequency and persistence of MHWs around the coast of Kyushu, which is influenced by two warm currents, the Kuroshio Current and the Tsushima Warm Current.We will use MODIS SST data and ocean reanalysis JCOPE-T DA.Our analysis for 2021 showed that MHWs occurred along the entire Kyushu coast after the passage of Typhoon Chanthu in September.We also find that the frequency and duration were greater around Tsushima Islands than the area southeast of Kyushu.In the future, we plan to discuss the role of ocean currents and mixing induced by typhoons on the spatial distribution and the magnitude of MHWs in more detail.