ゲリラ豪雨をもたらす積乱雲初期における鉛直渦管形成の解析

Abstract

In Japan, the frequency of Guerrilla-heavy rainfall is increasing, so it is quite important to predict the risk of heavy rainfall even within a few minutes. Nakakita et al. discovered the large vertical vorticity inside the baby cell aloft is useful to predict the Guerrilla-heavy rainfall, and also discovered the baby cells have vortex tubes which are similar to ones inside the initial cumulonimbus clouds of supercells. From this results, we considered that the vortex tubes inside the baby cells support fluid dynamics. This paper shows that the strongest updraft exists between positive vorticity and negative vorticity inside one sample cell using high ZDR column.