基于子波变换的烟台市降水变化特征的多时间尺度研究

Study on the Multiple Time Scales of Precipitation Variation Characteristics in Yantai Based on the Wavelet Transformation

为研究烟台市年降水量变化的多时间尺度结构特征,采用Morlet子波变换分析法,对烟台市1960-2004年的年降水量进行了小波分析。结果表明：近40年来,烟台市年平均降水量整体呈下降趋势,且存在明显的4年、13年和28年的3类特征时间尺度和相应的震荡周期;小波方差进一步分析发现,烟台市年降水量变化具有4年和13年的主周期,且以13年周期最为显著;由小波方差检验出主要周期的小波系数实部可知,在未来的15年内,烟台市降水将会处于偏丰期。

In this paper, wavelet transformation method is applied to study the multiple time scales of annual precipitation characteristics of Yantai from 1960 to 2004. The results show that： The precipitation variation is decreasing in Yantai from 1960 to 2004 and it has 4 years, 13 years and 28 years characteristic time scales and the characteristics of period variation; The precipitation has 4 years and 13 years periods and the 13 years period is especially outstanding calculated by variance; Based on the real part of wavelet coefficient, the precipitation will increase in recent 15 years in Yantai.