用小波分析方法诊断鄂尔多斯市降水周期变化

Diagnosis on the Periodical Variation of Precipitation by Morlet Wavelet Analysis Method in Erdos

利用1971-2008年鄂尔多斯市降水资料,使用Morlet小波分析方法分析了多雨区和少雨区降水的年际和年代际变化特征.结果表明：在年际尺度上,多雨区年降水有明显的14a和6a左右的变化周期,多雨区夏季降水有明显的15a和8a左右的变化周期;少雨区年降水有明显的14a和5a左右的变化周期,少雨区夏季降水有明显的12～15a和6a左右的变化周期;年代际变化尺度上,近38a鄂尔多斯市多雨区和少雨区夏季平均降水总量没有明显的变化特征.

Based on the precipitation data from 1971 to 2008 in Erdos, the characteristics of inter-annual and in- ter-decadal variation in more rainfall zone and less rainfall zone were analyzed by the Morlet wavelet method. The resuhs showed that two obvious variation periods of annual precipitation exist in the more rainfall zone, with 14 years and 6 years, while in summer have 15 years and 8 years variation. For the less rainfall zone, the period- ic variation of yearly precipitation is 14 years and 5 years, while in summer [lave 12 to 15 years and 6 years variation. There is no obvious variation and characteristics for average total precipitation of both zones in recent 38 years based on inter-decadal scales in summer.