山西省雷暴气候特征

Climatic Characteristics of Thunderstorm in Shanxi Province

使用山西72个气象站1971—2004年逐日雷暴资料,分析了山西省雷暴的时空分布特征。结果表明:雷暴主要集中在夏季,且北部、山区多,南部、盆地少,具有显著的纬度地带性及垂直性特征;REOF分析将山西雷暴异常划分为4个区,分别是北部区、南部盆地区、南部山地区和中部区,近34年来,各区域雷暴特征有较大差异,雷暴日数整体有减少趋势。

This paper analyzes on the spatial and temporal distribution Characteristics of thunderstorm based on daily weather datum of 72 observatories of Shanxi Province from 1971 -2004, and expounds the main results as follows：the thunderstorm occur mainly in summer; the thunderstorm days in the north part is bigger than that in the south part, the thunderstorm days in mountainous are is bigger than that in the basin area, the thunderstorm fields spatially are divided into 4 sub-regions, and the evidence shows greater difference in these mean fields among the different regions for the past 34 years; the general trend of the annual mean thunderstorm in Shanxi has been reducing since 1971.