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广东省梅州雷暴时空变化特征分析
引用本文:张晨辉,罗碧瑜,陈立宏.广东省梅州雷暴时空变化特征分析[J].安徽农业科学,2009,37(17):8060-8062.
作者姓名:张晨辉  罗碧瑜  陈立宏
作者单位:广东省梅州市气象局,广东梅州,514021
摘    要:利用广东省梅州地区5个代表气象站1965~2007年的逐日雷暴资料,采用数理统计、小波分析等方法分析梅州市雷暴天气的时空分布特征。结果表明,梅州地区的雷暴在空间上呈南多北少分布,雷暴日数总体较多且年际变化较大,但年雷暴日数有逐渐减少的趋势;雷暴主要集中在夏季(8月份雷暴最多);梅州地区初雷普遍出现在2月下旬3月上旬,终雷普遍出现在10月中旬,雷暴初、终日年际间差异较大,且初雷有越来越早的趋势,终雷有越来越晚的趋势;小波分析结果表明,梅州地区雷暴的年际变化普遍存在着准4a的短周期和12、22a左右的长周期,除北部地区外,整个时域中还存在7a左右的年际变化周期。

关 键 词:雷暴  时空分布  小波分析  初雷  终雷

Analysis on Spatial-temporal Variations of Thunderstorms in Meizhou City of Guangdong Province
Institution:ZHANG Chen-hui et al (Meizhou Weather Bureau, Meizhou, Guangdong 514021)
Abstract:With daily thunderstorm data in 1965-2007 from 5 representative stations in Meizhou area,Guangdong Province,the spatial-temporal variation of thunderstorm was analyzed by mathematical statistics and wavelets analysis methods.The results showed that the spatially distributed of thunderstorm was more in south and less in north in Meizhou area.The day-number of thunderstorm was many in total and its annual change was bigger,while the annual day-number of thunderstorm showed gradually decreeing trend.The thunderstorms mainly occurred in summer(most appeared in August).The initial thunderstorm in Meizhou normally appeared during the last ten-day of February to the first ten-day of March,while the ending thunderstorm normally appeared in the middle ten-day of October.The annual difference of initial and ending day of thunderstorms was bigger.The initial thunderstorms day showed more and more early trend and the ending thunderstorms day showed more and more late trend.The results of wavelets analysis showed that the annual variation of thunderstorm in Meizhou rifely showed a short period of about 4 a and a long period of about 12 and 22 a.Except north area,the annual variation of thunderstorm also had a changing period of about 7 a in the whole time domain.
Keywords:Thunderstorm  Spatial-temporal distribution  Wavelets analysis  Initial thunderstorm  Ending thunderstorm
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