东洞庭湖区城市雷暴活动规律

基于19612013年岳阳国家气象观测站雷暴观测资料,采用核密度估计、线性倾向方法、Morlet小波分析和Mann-Kendall趋势检验分析东洞庭湖区城市雷暴基本规律与变化情况.结果表明:19612013年东洞庭湖区城市雷暴日数以夏季的最多,春季的次之,秋、冬季节的较少,呈现波动减少的趋势,尤其是春、夏季雷暴日减少速...

The Law of Urban Thunderstorm Activities in Eastern Dongting Lake Region

Thunderstorm observation data from the Yueyang national meteorological observation station in 1961—2013 are used to analyze the basic law and variation characteristics of urban thunderstorm in the eastern Dongting Lake area with the methods of kernel density estimation,linear tendency method,Morlet wavelet analysis and Mann-Kendall trend test.The results show that the number of urban thunderstorm days in eastern Dongting Lake area is the most in summer,next in spring,and less in autumn and winter from 1961 to 2013.There is a trend of fluctuating decrease,especially in spring and summer.Thunderstorms tend to occur and end in the afternoon of summer and autumn,and in the early morning of spring and winter.The autumn thunderstorms last the longest,while the duration of the winter thunderstorms is the shortest.Most thunderstorms start from the surface of eastern Dongting Lake and end over the junction area between the lake and urban area.The frequency of daytime thunderstorms beginning on the lake surface is similar with that in the urban area.However,the frequency of daytime thunderstorm that ends in the junction part of the lake and urban area is higher.Nighttime thunderstorms mainly start from the lake surface,with most ending at their original location,and a few ending at the junction area of lake surface and urban area or behind urban area.The probability of thunderstorms which begin and end in the junction of the lake and urban area has increased significantly,and there is an apparent difference between the daytime thunderstorms and nighttime thunderstorms.