拉萨地区一次短时强对流天气中的冰雹和地闪活动特征分析

Analysis of Hail and Ground Lightning Activity Characteristics during A Short-term Strong Convective Weather Process in Lhasa Region

分析了2020年7月23日发生在拉萨市区短时强对流天气中的冰雹和地闪活动特征。结果表明:此次过程的地闪频数与冰雹之间有很好的对应关系,降雹阶段正地闪频数增加,负地闪减弱,正地闪占比最高;降雹阶段主要集中在20~60 kA之间的高电流强度;降雹时的雷电流陡度主要集中在5~10 kA/μs。

Analyzed the characteristics of hail and lightning activity during the shortterm strong convective weather event that occurred in Lhasa city on July 23,2020.The results indicated that,there was a good correspondence between the ground lightning frequencies and hail in this process.During the hailing stage,the positive ground lightning frequencies increased,the negative ground lightning weakens,and the proportion of positive ground lightning was the highest;The hailing stage mainly focused on high current intensity between 20~60 kA;The lightning current steepness during hailing was mainly concentrated at 5~10 kA/μs.