Xバンド偏波レーダーを用いた雨滴粒径分布とその時空間構造及び降水量の推定手法の開発

Abstract

In Japan, test operating of X-band polarimetric radar network started in July, 2010 by Ministry of Land, Infrastructure, Transportation and Tourism. Polarimetric radar has an advantage over conventional non-polarimetric systems because they measure some parameters related to raindrop shape. In this research, a retrieval method of raindrop size distribution (DSD) is developed to improve accuracy of rainfall estimation. The new developed DSD retrieving method was superior to previous method when heavy rainfall occurs. Then, the method was used to figure out the characteristics of DSD in a convective storm. After retrieving DSD parameters, rainfall estimation for non-polarimetric radar is directly estimated from the retrieved DSD parameters. Two methods are used, and both are evaluated using disdrometer, and it is shown that both are well estimated when compared with previous studies.