基于闪电定位仪资料的甘南州闪电时空分布特征研究  

Study on Temporal and Spatial Distribution Characteristics of Lightning in Gannan Prefecture Based on Lightning Locator Data

作　　者：王祥文 周昱 张艳荣 金满慧 WANG Xiangwen(Gannan Tibetan Autonomous Prefecture Meteorological Bureau,Hezuo,Gansu 747000)

机构地区：[1]甘南藏族自治州气象局,甘肃合作747000

出　　处：《农业灾害研究》2022年第7期149-151,154,共4页Journal of Agricultural Catastrophology

基　　金：甘南州气象局科学技术研究项目(GNMA2021-04)。

摘　　要：基于2012—2021年甘南州闪电定位仪资料,采用数理统计和Arc GIS空间分析方法,分析了发生在甘南州的雷电次数、强度的时空分布特征,结果表明:甘南州境内发生的闪电以负闪为主,占78.15%;正闪平均强度为59.964 1 kA、负闪平均强度为-47.125 1 kA、总闪平均强度则为53.694 6 kA;电流强度分布主要在0~50 kA之间,该范围内的闪电次数占总闪次数的70.16%。闪电活动主要集中在4—10月,日内变化则集中在13:00~24:00,且两者均以负闪为主。闪电频次在空间分布上呈现出南多北少、西多东少、西南地区闪电频次高于东北地区闪电频次的趋势;闪电强度的高值区主要分布在玛曲县、碌曲县和夏河县,其他地区较为分散,整体呈现西高东低的分布特征。Based on the lightning locator data of Gannan Prefecture from 2012 to 2021, this paper uses mathematical statistics and ArcGIS spatial analysis methods to analyze the temporal and spatial distribution characteristics of lightning frequency and intensity in Gannan Prefecture. The results show that the lightning occurring in Gannan Prefecture was mainly negative lightning,accounting for 78.15%;The average intensity of positive flash was 59.964 1 kA, the average intensity of negative flash is-47.125 1 kA,and the average intensity of total flash was 53.694 6 kA;The current intensity distribution is mainly in the range of 0~50 kA, and the lightning frequency within this range accounts for 70.16% of the total lightning frequency.Lightning activity is mainly concentrated from April to October, and the diurnal variation was concentrated at 13:00 to 00:00, and both of them were dominated by negative lightning.The spatial distribution of lightning frequency was more in the South and less in the north,more in the West and less in the East. The lightning frequency in the southwest was higher than that in the northeast;The high value areas of lightning intensity were mainly distributed in Maqu County, Luqu county and Xiahe County, and other areas were scattered,showing the distribution characteristics of high in the West and low in the East.

关 键 词：闪电定位仪 时空分布 电流强度 

分 类 号：P446[天文地球—大气科学及气象学]