近百余年北京气候变化的小波特征

文中对1870～1994年北京年、季平均气温，以及1841～1994年北京年、季降水序列进行了分析和小波变换计算，对所得结果进行了宏观分析。结果表明，温度增暖期和低温期与小波波幅中心间的周期增长、波幅加强相关联。降水距平绝对值越大，相应的小波周期越长和波幅越强。即小波分析在气候变化研究中显现了年与年之间、波长与波长之间的波幅变化形态与特征，从而为了解气温和降水随着年代的变化展示了一个视窗。

WAVELET CHARACTERISTICS OF CLIMATE CHANGE IN BEIJING SINCE THE 19TH CENTURY

The annual and seasonal temperatures during 1870-1994 and the annual and season-al precipitations during 1841-1994 are studied and calculated with the wavelet transfor-mation in this paper. The calculation results are analyzed synoptically. The results shows that the warming term and cooling term of temperatures correspond with the period ex-tending between wavelet amplitude centers and the strengthening of wavelet amplitude.The greater the absolute value of precipitation anomaly is,the longer the corresponding wavelet period is,as well as the stronger wavelet amplitude. Namely in climate change study,wavelet analysis can demonstrates the characteristics of the amplitude variation patterns among years and wavelet-lengths. So it exhibits a layout to understand the tem-perature and precipitation changes with interdecadal.