[A-OS17] Physical Oceanography (General)

[AOS17-P05] Impact of sea surface temperature of the Yellow and East China Seas on heavy rainfall event over Southern Kyushu during the Meiyu–Baiu Season

*Genki Shirasawa¹, Shinichiro Kako², Hirohiko Nakamura³ (1.Graduate School of Science and Engineering, Kagoshima University, 2.Kagoshima University, Faculty of Science and Technology, Department of Engineering, 3.Kagoshima University, Faculty of Fisheries)

Keywords:Atmosphere–Ocean Interactions, Yellow and East China Seas, Precipitation, Sea Surface Temperature

Sea surface temperature (SST) in the Yellow and East China Seas (YECS) plays an important role in determining the precipitation over Kyushu, Japan, during the Meiyu–Baiu season. However, the role of SST in the YECS in determining the interannual variability of precipitation over Kyushu during the Meiyu–Baiu season, as well as its characteristics, remain largely unknown. In this study, we clarity those characteristics by focusing on the long-term precipitation trends using in-situ observations derived from ground meteorological station in Kyushu. The interannual variation of accumulated precipitation every 10 days at each station were examined. We investigated the relationship between precipitation over Kyushu and SST in the YECS by comparing in situ observations with satellite SST data (J–OFURO3). The analysis period was from 1988 to 2018, during the Meiyu–Baiu season. The relationship between the increase in precipitation and SST variation in the YECS was investigated using a composite analysis. As a result, we found that only five stations in southern Kyushu (Aburatsu, Kagoshima, Tanegashima, Makurazaki, and Miyakonojo) had a significant positive increasing trend (90% level of significance) in late June. The increase in precipitation was consistent with that of SST in the Yellow Sea and south of the Kuroshio Current, while SST tended to decrease in the East China Sea over the continental shelf. When the interannual variability of SST average over these locations was compared to the accumulated precipitation in late June, the Yellow Sea had the strongest correlation coefficient (Yellow Sea: 0.616, the continental shelf: -0.350, over the Kuroshio: 0.204).