摘要
利用1971-2006年许昌地区逐日、逐月、逐年雷暴资料,通过数理统计和小波变换,分析许昌地区雷暴气候特征,结果表明:许昌地区雷暴日数年际变化幅度大,且雷暴日数年代际趋势变化阶段性显著,呈现出一定的波动性;年雷暴日数变化呈略微上升趋势,气候倾向率为0.01个/10 a;年平均雷暴日数年际变化存在着准4 a和10a左右的周期。
Using the daily, monthly, yearly thunderstorm data during 1971 - 2006 in Xuchang area, by means of mathematical statistics and wavelet transform methods ,we analyze the characteristics of thunderstorm climate in Xuchang. The results show that the interannual change of thunderstorm days in Xuchang presents a large range, and the interdecadal trends of thunderstorm days change significantly in the stage, showing a certain degree of fluctuation. However, the variation of thunderstorm days is slightly upward, with climate trend rate of 0.01 d/10a;meanwhile, the interannual change of average number of thunderstorm days exists a quasi-periodic of 4 and 10 yearly.
出处
《气象与环境科学》
2008年第1期56-59,共4页
Meteorological and Environmental Sciences
关键词
雷暴
气候特征
倾向率
小波变换
thunderstorm
climatic characteristics
tendency rate
wavelet transform
