石家庄地区不同地形雷电流幅值概率分布特征  

Characteristics of probability distribution of lightning current amplitude in different landforms in Shijiazhuang area

作　　者：李贵玲 周爽 张杏敏 姚云 范俊红 Li Guiling;Zhou Shuang;Zhang Xingmin;Yao Yun;Fan Junhong(Hebei Meteorological Service Center,Shijiazhuang 050021)

机构地区：[1]河北省气象服务中心,石家庄050021

出　　处：《气象水文海洋仪器》2024年第2期46-49,53,共5页Meteorological,Hydrological and Marine Instruments

基　　金：中国气象局创新发展专项“2020年灾害性天气预报技术总结分析”(CXFZ2021Z034);河北省气象局科研开发项目“基于服务对象的雷电临近预警指标研究”(22KY07)资助。

摘　　要：基于2016—2021年石家庄闪电定位数据,文章采用规程法、IEEE推荐公式及CIGRE推荐参数,对比分析平原和山区不同极性的地闪雷电流幅值概率分布特征,用最小二乘法进行拟合,得出适合石家庄的雷电流幅值推荐公式及参数取值。研究结果表明:石家庄地闪中负地闪占比达63%,电流幅值在1 kA~70 kA的占比超过96%,地闪与负地闪雷电流幅值概率分布趋势线更接近;负地闪发生在10 kA~20 kA最多,占比达35.66%,正地闪在1 kA~10 kA发生最多,占比达51.90%;平均雷电流幅值平原区域大于山区,负地闪高于正地闪;基于IEEE推荐公式进行参数修正后,计算得到的电流累积概率趋势线与统计值基本吻合,相关系数均超过0.99。石家庄雷电流幅值中值电流明显小于IEEE推荐值,与CIGRE接近,负地闪中值电流高于正地闪。研究结果为石家庄地区气象服务工作提供参考。Based on the lightning positioning data in Shijiazhuang from 2016 to 2021,the rubrics,IEEE recommended formula and CIGRE recommended parameters were used to compare and analyze the probability distribution characteristics of the amplitude of ground lightning flow in the different polarities in plain and mountainous areas,and the least squares method was used to obtain the recommended formula and parameter value of lightning current amplitude suitable for Shijiazhuang.The results show that 63%of the ground flash is negative,and the proportion of current amplitude in the range of 1 kA—70 kA exceeds 96%,The probability distribution trend line of lightning current amplitude is closer to the negative ground flash;the most negatice ground flash occured at 10 kA—20 kA,accounting for 35.66%,while the most positive ground flash occured at 1 kA—10 kA,accounting for 51.90%;the average amplitude in plain area is larger than that in mountain area,and the negative ground flashes are higher than the positive ground flashes;after parameter correction based on the formula recommended by IEEE,the calculated trend line of cumulative current probability is basically consistent with the statistical value,and the correlation coefficients are more than 0.99.The median current of lightning current amplitude in Shijiazhuang is obviously smaller than the IEEE recommended value,close to CIGRE,and the median current of negative ground flash is higher than that of positive ground flash.

关 键 词：平原 山区 雷电流幅值概率分布 石家庄地区 

分 类 号：P427.3[天文地球—大气科学及气象学]