川西高原典型雷电天气电场特征初步分析

Electrostatic Characteristics of Typical Lightning Weather in the Western Sichuan Plateau

利用四川省雷电监测网和川西高原甘孜、马尔康两个大气电场观测站资料,通过统计分析川西高原甘孜、马尔康两站多次典型雷电天气过程大气电场特征,得到大气电场正负变化过程会大多相互部分抵消,雷电对电场平均值影响不大,雷电天气过程电场值波动围绕分析周期内平均值上下起伏呈窄幅波动。同时,高原雷电出现条件电学特征上具有两个特征:一是高原每次雷电过程持续时间较平原短,但出现雷电过程频率高于平原地区;二是高原产生击穿放电电流幅值较平原低而击穿电场强度较平原为大。

Using the ADTD lightning monitoring dataandtheatmospheric electric field data of the Ganzi and Maerkang station of western sichuanplateau,we analyzed the characteristics of atmospheric electric field in several typical thunderstorm weather processes of Ganzi and Maerkang.The results show that most of the positive and negative changes in the atmospheric electric field are partly offset by each other,and the influence of lightning on the average value of the electric field is not significant.In the analysis period,the fluctuation of the electric field value has a narrow amplitude fluctuation character around the average value of atmospheric electric field.At the same time,there are two characteristics in the plateau lightning.One is that the duration time of the lightning process is shorter in the plateau than in the plain,but the frequency of the lightning process is higher than that in the plain.The two is that the amplitude of the lightning breakdown current in the plateau is lower than that in the plain,but the strength of the breakdown electric field is larger than that in the plain.