11 Change Features of Cloud Microphysical Structure of Severe Convective Storm Clouds By Polarimetric Radar Observation

Monday, 28 August 2017
Zurich DEFG (Swissotel Chicago)
Hui Xiao, Univ. of Chinese Academy of Sciences(UCAS), Beijing, China; and Y. Sun, H. L. Yang, G. Wen, and L. Feng

A large-scale severe convective storm clouds and precipitation event occurred in eastern Beijing on 22nd August 2015, and an artificial hail-suppression seeding operation aimed at this event was conducted. In this paper, the Change Features of the severe storms event was analyzed, using both the reflectivity from S-band operational weather radar and the retrieved cloud microphysical structure identified by an X-band polarimetric radar. It is found that the intensity decreasing trend of dealt storm cells can be significantly accelerated after artificial seeding. The seeding leads to a rapid range expansion of graupel and a gradually expansion of snow, decreasing the range of hail in the cloud significantly at the late stage of a storm cell, which illustrates that seeding can indeed change the microphysical process in severe convective storms. Meanwhile, the area of vertical oriented ice crystal in the high level of a severe storm has a corresponding relation with the region of negative differential reflectivity (ZDR) and negative specific differential phase (KDP).
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