メソアンサンブル気象計算に基づく平成29年7月九州北部豪雨のメカニズム調査，およびトリガーとなる気象擾乱の検知

抄録

This study investigates the impact of the first domain size, initial and boundary conditions, and sea surface temperature on occurrence of the record-breaking line-shaped rainband at the northern part of Kyusyu in July 2017, which caused 39 casualties. The smaller the first domain, the stronger the line-shaped rainband and the better reproducibility. The boundary of the first domain in accurate simulations overlapped the high humidity regions, thereby indicating the importance of proper setting of the lateral boundary of water vapor. Incorporating accurate SST led to the better reproducibility, too. Pressure gradient from East China Sea to the northern part of Kyusyu played an important role in the occurrence of this rainband with the water vapor supply by atmospheric river which covered the whole Kyusyu and the northern sea of Kyusyu.