近10年咸宁地闪回击特征分析

Analysis of the Spatial and Temporal Distribution Characteristic of the 10 a Return Strokes of Cloud-to-Ground in Xianning Area

  • 摘要: 以咸宁2007—2017年的雷电定位系统(ADTD)数据为基础,利用数理统计等方法分析了咸宁六个县市区地闪回击次数、回击密度、回击强度的时间和空间变化特征。结果表明,咸宁地闪回击以负极性居多,占总地闪的90%以上。3—9月是雷电集中高发期,午后至傍晚是雷电活动最活跃时段;北部平原地闪回击密度较南部山区高,平均电流强度低于山区;南部山区总地闪回击次数较北部多,通山县年平均回击次数达到8873次。咸宁地闪回击密度的地区差异性分布可能与地形和局地小气候有关。

     

    Abstract: To further understand the pattern of lightning activities in southeast Hubei, based on the data obtained from lightning location system (ADTD) in Xianning between 2007 and 2017, the characteristics of the temporal and spatial variations of the number, density, and intensity of return strokes of cloud-to-ground lightning in six counties and districts in Xianning were analyzed with mathematical statistics and other methods. The results indicated noticeable seasonal variations in lightning activities in Xianning, spring and summer from March to September were the highest period of lightning with two peaks, the main peak and the secondary one being August and July respectively. And 13:00-18:00 BT saw the most active lightning activities in a day. With respect to the spatial distribution of lightning activities, the northern area showed higher density of return stokes compared with the south; Tongshan county in the south, which features mountainous terrain, was found with the highest number of total return strokes, reaching an annual average of 8873 times.

     

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