湖南省雷暴地闪特征初步分析

利用湖南省1980-2010年雷暴日数据、2008-2013年闪电数据,分析了湖南省雷暴和闪电变化特征。结果表明:湖南省属于雷暴多发区,年平均雷暴日数分布呈南高北低的趋势,沿雪峰山有个相对高值区,平均雷暴日数在30d到70d之间。湖南省6年的年平均闪电条数35万余条,雷电高发时段为4-9月,其中7月是全年闪电活动最密集的月份。春季(3-5月)闪电逐时分布呈现双峰型,高峰值出现在02时、17时,夏季(6-8月)闪电多集中在下午15-17时,秋季(9月)高峰期集中在15-16时。湖南省闪电密度分布和闪电强度分布,高值区均在娄底、郴州,全省闪电主要强度分布在20-80kA。

A Preliminary Analysis of Characteristics of Thunderstorm Lightning in Hunan Province

This paper analyzes the change characteristics of thunderstorm and lightning in Hunan province by using the thunderstorm data in 1980-2010 and the lightning data in 2008-2013 of Hunan province. The results show that Hunan province belongs to the thunderstorm prone area, the distribution of annual average thunderstorm days reflects the meteorological trend that the south is higher than the north. There is a relatively high value area along the Xuefeng mountain, whose average thunderstorm days are between 30d and 70d. The annual average lightning number of 6 years in Hunan province is more than 350000, thunder and lightening peak time is 4-9 month, and July is the most densely populated month of lightning activities. The lightning hourly distributes in double peak type in spring （March-May）, and the peak value appears in 02 am, 17 pm;the lightning appears in the 15 to 17 pm in summer （June-August）;the peak appears in 15 to16pm in autumn （September）. The high value area of the lightning density and the lightning intensity distribution is in Loudi and Chenzhou in Hunan province and the lightning intensity distribution is mainly in 20-80 kA in the whole province.