发生冰雹灾害的对流性天气地闪特征分析

Analysising Hail Disaster Occurred Convective Weather For CharActerIstics Of Flash

利用地面雷电定位系统的观测资料,结合天气背景及地理特征,对2004～2006年期间发生在湖南省湘西自治州、邵阳市、株洲市等3市(州)的10起冰雹灾害天气进行综合分析,并详细分析3次典型过程的地闪特征,结果表明:冰雹天气都伴有地闪发生,地闪平均持续时间为2h左右,每10min的地闪峰值在1～19次之间,正地闪比例不高,与北方冰雹天气的高正地闪频数特征存在明显不同,持续过程中都会出现地闪频数峰值或次峰值,其平均雷电强度和平均雷电陡度均高于一般雷暴天气.

Using ground observation data of Lightning positioning system and weather background and geographical features, for the period between 2004 and 2006 occurred in Xiangxi Autonomous Prefecture of Hunan Province, Shaoyang City, Zhuzhou City,10 hail disaster weather is comprehensively analy,sed 3rd and detailed analysis of the typical characteristics of the process of the flash, Hail weather occurred with the flash, and flash average duration of 2 h, 10 min each of the flash in the peak between 1 to 19 are blinking ratio is not high, with the Northern Hail to the high flash frequency is significantly different characteristics, Continuous process will occur in flash frequency of the peak, the average lightning steep and the average intensity of thunderstorms were higher than normal weather.