河南省雷暴日数时空分布的非均一性特征

Non-uniformity of spatiotemporal distribution of annual thunderstorm days in Henan Province

利用河南省气候中心编制的97个台站1961-2000年雷暴日数的资料,对该省境内雷暴发生的时空分布非均一性进行了分析。结果表明:全省平均雷暴日数有明显下降的趋势;雷暴日数站间偏度系数具有明显的年际变化特征,80%的年代表现为正偏;而其峰度系数则60%的年份为负值,且具有明显的年际变化特征。年平均雷暴日数及其均方差空间分布型态比较一致。豫北、豫西和豫东南分别出现3个雷暴高发区,其中豫东南强度最大,豫西强度与其相当,豫北相对较小。历年雷暴日数以正偏为主;峰度系数则以负值为主。河南省除信阳地区外,各站雷暴日数在0.05置信水平上服从正态分布。

Using the data of annual thunderstorm days from 97 stations in Henan Province during 1960 -2000, the spatial and temporal non-uniformity of thunderstorm in the province was analyzed. The results show that mean annual thunderstorm day in Henan Province is 24.9d, and has an obvious decreasing trend. The skewness （sharp-ness） coefficients of thunderstorm days among stations, which have a distinct annual variance, is negative （posi-tive） for the 80% （60%） years. There are visible correlation between mean thunderstorm days and its standardized variance, which can pass the significance test at 0.001 confidence level. Thunderstorm days in all stations except Xinyang station obey the normal distribution.