【摘要】 选取海南岛18个站点1965～2007年的43a雷暴日资料,采用经验正交函数分解(EOF)等方法分析了海南岛的雷暴日分布特征。结果表明:海南岛雷暴活动频繁,各市县年平均雷暴日在94d以上,最多达到了149d,雷暴日空间分布具有明显的区域性,中部以及北部的雷暴日比较多,而在南部雷暴日相对偏少;雷暴日的季节变化明显,冬季极少,夏季时雷暴明显偏多,最高为7月份的22d;另外,雷暴日的年际变化存在明显的准周期16a以及5a的小震荡周期。更多还原

【Abstract】 The spatial daily distribution of thunderstorm in Hainan Island were analysed by using Empirical Orthogonal Function(EOF) based on daily thunderstorm data from 19 stations for 43 years from 1965 to 2007. The results showed thunderstorms frequented Hainan Island, with thunderstorm days being more than 94 days/year by average for all the cities and counties in Hainan Island and 149 days at maximum. The spatial distribution of the thunderstorm days is obviously regional: more thunderstorm days in the central and northern parts of Hainan Island and relatively fewer in the south. The number of thunderstorm days varied significantly in seasons: small in winter but obviously large in summer with the maximum in July (22 days of thunderstorm). Moreover, there was a quasi period of 16 years and an alternating period of 5 years for interannual change of thunderstorm days.更多还原