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《Geographical Research》 2009-02
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A wavelet analysis of the precipitation time series in Northeast China during the last 100 years

JIANG Xiao-yan1,LIU Shu-hua1,3,MA Ming-min2,ZHANG Jing1,SONG Jun4(1.Shenyang Meteorological Bureau,Shenyang 110168,China;2.Department of Atmospheric Sciences,School of Physics,Peking University,Beijing 100871,China;3.Laboratory for Climate Studies,China Meteorological Administration,Beijing 100081,China;4.Dalian Meteorological Bureau,Dalian 116001,China)  
In recent 100 years,global warming is increasing remarkably,and there are even greater uncertainty,changing precipitation trend and regional differences.In this study,a wavelet analysis method of Morlet is used to research the periodical regulations at different time scales of the precipitation time series during the latest nearly 100 years in Northeast China.Based on the monthly and annual precipitation data of Harbin,Shenyang,Changchun and Dalian weather stations covering the period from 1905 to 2005,the periodic oscillation of precipitation and the points of abrupt change at different time scales along the time series are discovered and the main periods of every serial are confirmed.The result shows that the precipitation of Northeast China has a decreasing trend,with rates of-5.2mm/10a,and-12.7mm/10a,-7.1mm/10a,-2.7mm/10a,1.3mm/10a for Northeast China,Changchun,Harbin,Dalian and Shenyang respectively.There are multi-time scales of periodical change,which present appears different traits at different phases.There are periodic oscillations of 2a-3a,5a-6a,10a and 50a for the seasonal and annual precipitation variations.The local characteristics of time-frequency for wavelet analysis can demonstrate the detailed structures of precipitation.The wavelet analysis can be an alternative approach to the analysis of climate multi-time scales characteristics and the forecast of short-term climate variations.
【Fund】: 辽宁省气象局正研级专业技术人才培养专项科研基金项目
【CateGory Index】: P426.61
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