摘要
利用1958-2007年北京首都机场夏季雷暴逐日统计资料，分析了50年来首都机场雷暴气候的时间分布特征，并利用小波分析方法研究了首都机场7～9月雷暴的年际和年代际变化规律。结果表明：近50年来，首都机场7～9月雷暴分布存在着比较明显的日变化，雷暴总日数呈下降趋势，尤其是7、8月的雷暴日数下降最为明显；7～9月雷暴日数存在着明显的1～2年、4～6年和准10年的周期性振荡，其中1～2年周期的振荡最为显著，但准10年的周期性振荡也比较明显。
The daily thunderstorm data from the Capital Airport （Beijing） from 1958 to 2007 are used to perform the analysis of the temporal variations of summer thunderstorms, and the wavelet analysis is used to disclose its inter-annual and inter-decadal variations. The results show that there was obvious daily variation in thunderstorm weather from July to September in the recent 50 years; there was a decline tendency in thunderstorm days, especially in July and August; obvious 1 to 2, 4 to 6, and cluasi-10 year oscillations can be found in summer thunderstorm days at the Capital Airport, among which 1 to 2 year oscillations are most significant; meanwhile, the quasi-10 year oscillation is also obvious.
出处
《气象科技》
北大核心
2009年第4期420-424,共5页
Meteorological Science and Technology
关键词
小波分析
雷暴
气候特征
首都机场
wavelet analysis, thunderstorm, climatic characteristic, Capital Airport
