近50年福建省雷暴气候特征分析

Analysis of CUmatic Features of Thunderstorm over Fujian Province in the Last 50 years

利用福建67个气象站1960～2007年逐日雷暴资料，分析了福建省雷暴的时空分布特征。结果表明：福建省年雷暴日数特点是内陆多，沿海少。近50年福建省雷暴有明显减少的趋势。雷暴日有明显的季节变化：3～9月是雷暴的多发期，8月份达最高值。平均初雷日西北部地区早于东南部地区，平均终雷日北部地区和南部地区差异不大，相差十几天。由于我省北部和西部地区初雷日出现得早，终雷日出现得晚，造成全年雷暴活动时间比沿海长辑多。

BBased on the daily observation data of thunderstorm from 67 stations in rujian province during 1960-2007, study is performed of the temporal and spatial distribution features of thunderstorms such as annual, seasonal and monthly variability. The results show that the annual number of thunderstorm days decreases from inland to coastal areas and has a significant decreasing trend. The obvious seasonal variation of thunderstorm can also be detected, and the period of March to September is the most frequent months for thunderstorm which peaks in August. The average first date of thunderstorm occurrence in the northwestern areas is earlier than that in the southeastern areas, however the average last date has little difference around ten days in the northern and southern regions. The duration of annual thunderstorm activities in western and northern Fujian has a month longer than that of coastal areas due to the earlier- initial and the later-ending dates.