2007年浙江地区梅雨期闪电特征的分析

Study on the characteristics of lightning during Meiyu period around Zhejiang in 2007

基于浙江省闪电探测网获取的地闪资料,从闪电的空间分布、日变化、强度等方面分析了2007年浙江地区梅雨期的闪电分布特征。结果表明,浙江地区梅雨期闪电的空间分布与地形有关;云地闪中负闪约占97%;地闪具有明显的日变化,总体呈单峰单谷形式;地闪的强度与频数存在反位相的关系。另外,本文对闪电与降水的关系进行初步分析,发现2007年浙江地区梅雨期降水与正地闪具有较好的相关性,得到午后累计降雨量与对应时段内正地闪频数的回归方程P=8.8016R+491.54,相关系数r为0.3。

Based on the cloud-to-ground （CG） data during Meiyu period in 2007 collected by lightning detection system in Zhejiang, a study was made of the temporal and spatial distribution of lightning as well as the intensity. The results show that the spatial distribution of lightning is related to the topography, the negative flashes amount to about 97% of the total CG flashes, the CG flashes have a daily variation characteristic with a big peak, the frequency and the intensity of the flashes is antiphase. Furthermore, the regression equation between the precipitation intensity （R） and the frequency of CG lightning （P） during Meiyu period is P =8. 8016R ＋491.54, and the correlation coefficient r is 0. 3.