冰雹云系发展演变与其地闪的相关性分析

Correlation Analysis between Evolution of Hail Cloud System and Cloud-to-Ground Lightning

对山东地区6次冰雹过程闪电定位仪资料和雷达回波资料的 分析结果表明,降雹区域内10 min闪电频数分布呈规律变化,在降雹前32～220 min闪电出现10次以上的峰值,冰雹发生前2 h正闪电迅速增加,雹后又迅速减弱。雹前正闪电基本占总闪电的50%以上。闪电基本分布在雷达回波内,但闪电密集区与强回波区并不完全对应。闪电密集区移动可以标识出冰雹云的发展移动路径;10 min降雹区域闪电频数、正闪电所占的比值和闪电时间序列分布,可能起到预警冰雹的作用。

An analysis is made of the data from lightning position finders and radar echo data in 6 hail processes in Shandong Province. The results indicate that there was a regular variation in the 10-min frequency distribution of lightning, with the peak （10 times） appearing 32 to 220 minutes before hailing; the positive lightning strikes increased rapidly two hour before hailing and then decreased rapidly. The positive lightning occupied basically above 50 % of the total lightning before hailing, and lightning strikes distributed basically within the range of radar echoes. The lightning-concentrated areas did not completely correspond to the strong echo areas, but the movement of the lightning-concentrated areas can indicate the. moving and developing track of hail clouds. The lightning frequency, the ratio of positive lightning to total, and the lightning time series can be used as references in hail warming.