浙江和甘肃两地区地闪特征的初步对比分析

Characteristics of Cloud-to-Ground Flashes in Zhejiang and Gansu Areas

利用浙江和甘肃两地区地闪活动的闪电定位资料,对两地地闪的时间变化规律和强度分布及其差异进行了对比研究。结果表明,两地闪电活动的月变化、日变化以及强度分布差异较大,浙江地区正地闪占总地闪的比例及夜间地闪所占的比例均小于甘肃地区,浙江地区地闪频数在6~8月较多,甘肃地区地闪频数在7~9月较多,浙江地区地闪日变化中总地闪达到峰值的时间比甘肃地区要早,而正地闪达到峰值的时间较为一致;最后,将地闪活动与大气不稳定因子（CAPE）结合讨论,对比分析发现夏季杭州附近的CAPE平均值比兰州附近的大,但地闪活动频数对CAPE变化的敏感性要比兰州附近的小。而造成两地地闪活动差异的原因可能与两地不同的地理条件及雷暴产生系统有关。

Based on the cloud-to-ground flashes data obtained by lightning location system from Zhejiang and Gansu, the regularities of lightning factors have been analysed respectively. The results indicate that there are great differences in monthly and diurnal variations and intensity spectra in different areas. This gap makes us pay attention to correlations between the convective available potential energy（CAPE） and the lightning activities. It shows that the CAPE is higher in south-east than in north-west, but the sensitivity of lightning to CAPE is lower than north-west.