2006-2009年安徽省闪电活动时空特征分析

根据安徽省2006~2009年4年来10个地面测站的闪电定位数据资料,分析安徽省闪电活动的时空分布特点。从时间分布来看,闪电频次分布具有明显的季节性,春季闪电发生频次上升,夏季7月达最大值,秋季下降,至冬季达最小值。在闪电发生频次逐时分布中呈现出一定规律性,闪电多发生在1天中15:00-17:00,而在9:00发生频次最少。通过分析闪电空间密度分布图可以发现,南部闪电密度大于北部,原因是北部以平原为主,南部以山丘为主,且南北气候类型不同,北部为暖温带半湿润季风气候,南部为亚热带湿润季风气候,而且与北部相比南部经济发展快,城市高层建筑多,人口密度大,和空气污染相对严重。

Cloud-to-ground Lightning Temporal and Spatial Characteristics in Anhui Province in 2006 - 2009

Spatial and temporal distributions of lightning activities were analyzed in the study, with 4-year data （2006-2009） collected from ten ground stations in Anhui province. A clear seasonal change of lightning occurrence was observed, which was low in autumn and winter, higher in spring, and reached the peak in summer. A clear diurnal change of lightning occurrence was also observed, which had a high frequency at 15：00-17：00 pm and a low frequency at 9：00 am. The frequency of the lightning occurrence is higher in the south of the Anhui Province than that in the north, due to the high mountains and the sub-tropical humid climate in the south but flatland and sub-humid warm temperate continental monsoon climate in the north. More buildings and larger population caused by the rapid development of the economy, are also important reasons for the more lightning occurrence in the south.