区域海拔高度变化对闪电特征影响的初步分析

The preliminary analysis of the influence of region's elevation change on lightning characteristics

利用重庆闪电定位系统监测的地闪资料（1999~2008年）,通过数理统计、线性回归等方法,重点分析区域海拔高度变化对闪电特征的影响.结果表明：①闪电频次分布最多的是在海拔300~400 m这个高度区间,之后开始随海拔上升逐渐减少;②闪电中负闪次数远远大于正闪,但是在不同海拔时正负闪所占的比例不同,随着海拔高度的增加,特别是在高海拔地区,正闪的比例不断增加;③正闪的平均强度随海拔上升变化较明显,特别是在高海拔地区,正极性闪电的平均强度随着海拔高度上升不断增加;④闪电强度超过200kA的大幅值闪电在不同海拔时所占比例是不同的.高海拔地区幅值超过200 kA的闪电所占比例要比低海拔地区大.

Analyzed the cloud-to-ground flash data（1999-2008） monitored by Chongqing lightning location system,through methods of mathematical statistics and linear regression to show the impact on lightning characteristics with regional altitude changed.The results showed that：① the largest distribution of lightning frequency was in the high range 300-400 m above sea level,and then began to gradually decrease with increasing elevation;② the numbers of negative flash were far greater than the positive flash,but the share of positive and negative flash proportion were different when the altitudes changed,as the altitude increasd,especially at high altitudes,the proportion of positive lightning was increasing;③ The average flash intensity was increased with the elevation change,especially in high altitude areas,the average intensity of positive polarity lightning with the increase of altitude;④ lightning intensity over the value of 200 kA lightning large proportion of the time at different altitudes was different.Amplitude at high altitude over 200 kA lightning than the proportion of low-lying provinces.