基于Morlet小波的甘肃省近50年气温变化分析

Morlet Wavelet Analysis of Temperature Changes in Gansu Province in Recent 50 Years

利用甘肃省气象站1963~2012年的逐月平均气温资料,采用Morlet小波分析了省内年平均气温变化的多时间尺度特征。结果表明,近50年来甘肃省年平均气温呈现暖—冷—暖的循环交替特征;存在2~4、10~12、17年3个明显的振荡周期,以2~4年为主周期,其次是17年,10~12年的振荡最弱。

Abstract Based on monthly average temperature data in Gansu meteorological station from 1963-2012,the multi-time scale characteristics of annual average temperature variation was analyzed by using Morlet wavelet. The results showed that it presents a warm--~cold^-~warm cycle alter- nating characteristics of Gansu Province in recent 50 years and exits three evident characteristic time scale （2 -4a, 10 - 12a and 17a）. 2 -4a was the main cycle,the oscillation of 17a and 10 - 12a was the weakest.