해양-대기 접합모델을 이용한 큐슈 지형에 의한 2020년 태풍 하이선의 영향 조사

Abstract

This study investigates how the topography of Kyushu affected the track, intensity, and precipitation of Typhoon Haishen (2020), which headed towards the Korean Peninsula, through a series of sensitive experiment using a coupled ocean-atmosphere model. The sensitivity experiments is designed with modifications of the Kyushu topography: reduced topography (RED), experiments with real topography (CTL), and experiments with enhanced topography (ENH). The modelling results show that the topography of Kyushu has influenced the track, intensity, and associated precipitation of Typhoon Haishen as it approached Korean Peninsula. Analysis reveals that the Kyushu topography deflected the Haishen's track to the northeast. Kyushu's topography also weakened the intensity of Haishen (in terms of central pressure) due to increased frictions, but it diverted typhoon-induced southerly winds near the Kyushu Island, resulting in the increase in the maximum wind speed of Haishen by wind convergence. The typhoon-associated water vapor collided with the topography of Kyushu, causing more precipitation in Kyushu, which reduced precipitation on Jeju Island. This result can be used as basic data when predicting typhoons approaching the Korean Peninsula. However, since this study is based on the result of one typhoon case, it is necessary to perform additional experiments on more typhoon cases in the future in order to generalize this result