近37年南充市雷暴的气候特征分析

Analysis of climatic characteristics of thunderstorm in Nanchong during past 37 years

利用南充市7个站点1971-2007年的雷暴观测资料,通过数理统计分析和初终日期的保证率计算,分析了南充市雷暴的气候变化特征。结果显示:近37年南充市雷暴日数总体呈减少的趋势,每10年雷暴日数减少约3.5天,但全市年雷暴日数仍较多,年平均为31.9天,除1月无雷暴发生外,其余11个月均有雷暴发生,4-9月雷暴日数占全年的93.8%,其中7-8月占53.1%,属于强雷季节。在80%的保证率条件下,初终间日数达237天。

With the thunderstorm observational data of sever stations between 1971 and 2007 in Nanchong the climate change characteristics of the thunderstorm are analyzed by the mathematical statistics and the guaranteed rate com- poutation of the dates of the first and last days. In recent 37 years the number of the thunderstorm days is decreased with a tendency of 3.5 days per 10 years. However the number of the thunderstorm days in the city is still more and the annual average is 31.9. The thunderstorm occurs during 1 lmonths except January. The days of the thunderstorm are 93.8% of the whole year form April to September and 53.1% from July to August which belongs to the strong thunderstorm season. Under the 80 % guaranteed rate conditions there 237 days between the first and last day.