Japan Geoscience Union Meeting 2023

Presentation information

[E] Online Poster

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

[A-CG30] Extratropical oceans and atmosphere

Mon. May 22, 2023 1:45 PM - 3:15 PM Online Poster Zoom Room (2) (Online Poster)

convener:Shion Sekizawa(Research Center for Advanced Science and Technology, University of Tokyo), Shota Katsura(Atmosphere and Ocean Research Institute, The University of Tokyo), Yuta Ando(Kyushu University), Shoichiro Kido(JAMSTEC Application Lab)


On-site poster schedule(2023/5/21 17:15-18:45)

1:45 PM - 3:15 PM

[ACG30-P06] Future changes of tropical cyclone-induced precipitation distribution around Kyushu Islands in dynamically downscaled large-ensemble simulations

Shuhei Yamaguchi1, *Takashi Mochizuki1, Ryuichi Kawamura1, Tetsuya Kawano1 (1.Department of Earth and Planetary Sciences, Kyushu University)

Keywords:global warming, tropical cyclone, dynamical downscaling

By using a large-ensemble set of 5-km resolution (SI-CAT DDS5TK) simulations dynamically downscaled from 20-km resolution (d4PDF-RCM) simulations, we define statistical changes in precipitation distribution around Kyushu Island associated with tropical cyclone attacks in future. The d4PDF-RCM represents the enhancement in intensity and decrease of the numbers of the tropical cyclone over the Northwesten Pacific. The precipitation amount is increased near the center of the individual tropical cyclone. In contrast, the SI-CAT DDS5TK can represent detailed spatial patterns of rainfall changes rather than uniform increase, particularly due to potential influences of the finer-resolved topography. When focusing on the east coast of Kyushu Island where the tropical cyclone attack is a major factor to control the rainfall changes in future, the tropical cyclone works to reduce the rainfall through the southward shift of the moisture flux convergence. The rainfall is enhanced at the sea surface of the southeast of the Kyushu Island, probably because the tropical cyclone moves more slowly, its lifetime becomes longer and hence a chance of attack of relatively weak cyclones can be increased in the extratropical area.