Kaバンド偏波レーダのマルチパラメータ情報を利用した積乱雲発生の基礎的解析

Abstract

Nowadays, the frequency of tragic disasters caused by localized torrential rainfall is increasing. This tragic disaster was brought by suddenly generated and rapidly developed isolated cumulonimbus cloud. For earlier risk detection of torrential rain fall, some researchers use Ka-band cloud radar and they revealed it can detect cells 20minutes before X-band radar can. In this study we analyze the cumulonimbus cloud in earlier stage in different aspects and it was found the relationship between Ka-band radar first echo height and cloud particle development by comparison Lifting Condensation Level with first echo height. Secondly, we found the growing speed was the highest in time of X-band radar first echo appeared. Finally, we reveals Ka-band radar can detect the vorticity in earlier stage than it had observed by X-band radar. These result shows usefulness of Ka-band radar for applying Early detection system and risk judge system.