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《Journal of Arid Meteorology》 2017-04
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Study on Identification Index of Hail Cloud Based on CPAS System in Anshun of Guizhou

LIU Xiaoyan;SUO Yong;WANG Jin;Anshun Weather Modification Operations Command Center of Guizhou Province;Weather Modification Office of Guizhou Province;  
Based on the CPAS system,the characteristic parameters such as echo intensity,vertical liquid water content(VIL),height of 45 d BZ radar echo top,echo bottom and strong echo center for 26 hail cases in Anshun of Guizhou Province during 2009-2015 were analyzed. Combined with the height of 0 ℃ and-20 ℃ layers in Guiyang radiosonde station,the identification indicators of hail cloud in Anshun city were synthetically summarized. The results show that the hail weather processes occurred from March to June during2009-2015 in Anshun of Guizhou Province,and the frequency of hail occurrence was the most in April and the least in June. The maximum echo intensity of most hail clouds in Anshun city was 45 d BZ and above before the falling of hail,and the value of VIL in March and April was more than 15 kg·m-2,while that in May and June was greater than 25 kg·m-2. The average height of 0 ℃and-20 ℃ layers on the day of the hailfall gradually increased from March to June,and the latter was 3. 11 km higher than the former. The height of 45 d BZ strong echo of hail clouds was greater than 8 km,the height difference between strong echo center and 0 ℃layer was greater than 0 km,and that between 45 d BZ strong echo top and 0 ℃,-20 ℃ layers were greater than 2. 3 km and 0. 2 km,respectively,which could be taken as indictors for identification of the hail clouds. The early warning indictors could effectively guide the hail suppression operation by applying for a case.
【Key Words】: Anshun of Guizhou Province hail characteristic parameter recognition index
【Fund】: 贵州安顺市气象局科研项目“基于CPAS系统的安顺市雹云识别指标应用研究”;; 贵州省工程技术研究中心建设项目(黔科合G[2013]4001号);; 中国气象局气象关键技术集成与应用项目(CMAGJ2015M53);; 贵州省气象局重大专项项目(黔科合ZD[2011]04号)共同资助
【CateGory Index】: P407;P426.64
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