一次超级单体风暴的天气学成因及多普勒雷达回波特征研究

对2002年5月27日发生在安徽蚌埠地区的一次超级单体风暴过程的天气形势、卫星云图、雷达回波进行了分析,此次过程为该地区近50 a来发生的最强烈的一次超级单体风暴过程。本文尝试从常规的高空、地面环流形势中寻找特殊的异常信息,结合卫星云图、多普勒雷达资料对超级单体的结构及其演变过程进行分析。发现这次强对流性超级单体风暴过程是在较为有利的大尺度环流形势下,多尺度天气系统相互作用,由中尺度对流云体激发产生的超级单体风暴;文章揭示了该地区超级单体风暴的多普勒雷达回波典型特征,旨在对这类强天气的监测、识别和临近预报提供天气学及雷达回波分析的参考依据。

SYNOPTIC AND DOPPLER WEATHER RADAR DATA ANALYSIS OF A SUPERCELL STORM

Comprehensive analyses and researches on synoptic situation,satellite images,radar echo and disasters were carried out for a supercell on May 27,2002,which is the most severe one during last 50 a in north area of Anhui Province.Results show that the interaction of multi-scale synoptic systems results in the small-scale thunderstorm cell transforming into mesoscale convective systems which leads to this supercell storm.Cold advection on upper level overlapping warm advection on low level and the temperature and moisture increasing on low level offered ample energy.The strong concentrated and upward vertical movement overlapping the convective movement region is the dynamic mechanism which stimulated the severe convective storm.This paper reveals the radar echo characteristics of a supercell storm,offers reference on synoptic and radar echo to detect and nowcast severe convective storm.