基于小波理论的长春市近50年来降水变化特征  

Precipitation Change in Changchun Last 50 Years Based On Wavelet Theory

作　　者：张伟[1] 闫敏华[2,3] 彭淑贞[1] 梁明英[1] 赵敬民[1] 徐莉[1] 

机构地区：[1]泰山学院旅游与资源环境学院,山东泰安271021 [2]中国科学院东北地理与农业生态研究所/中国科学院湿地生态与环境重点实验室,长春130012 [3]中国科学院研究生院,北京100049

出　　处：《中国农业气象》2009年第4期515-518,共4页Chinese Journal of Agrometeorology

基　　金：国家自然科学基金(40771190);泰山学院博士科研启动基金

摘　　要：利用长春气象站1951-2001年共51a的夏季降水量和年降水量序列资料,采用复Morlet小波方法分析了长春市夏季降水量和年降水量时间-频率的多时间尺度变化特征。结果表明,长春市夏季降水量和年降水量的年代和年代际时间尺度在时域中分布不均,具有明显的局部化特征;夏季降水量序列主要存在5a、15a左右的周期,年降水量序列主要存在5a、8a、16a、22a左右的周期。年降水量与夏季降水量在时间尺度和周期特征方面非常相似。By using summer precipitation and annual precipitation sequence data last 51 years （1951 -2001 ） from Changehun weather station, the temporal-frequency multi-time scale and jump features of summer and annual precipitation （1951 -2001） in Changchun were analyzed based on complex Morlet wavelet. The results showed that the time scales of the summer and annual precipitation time series were uneven in time domain, the local characteristics were obvious. Summer precipitation time series were 5 and 15 years periods. Annual precipitation time series were 5 years, 8 years,16 years and 22 years periods. The annual precipitation and summer precipitation are very similar in terms of time scales and cycle characteristics.

关 键 词：MORLET小波 降水量 时间序列 多时间尺度 

分 类 号：P467[天文地球—大气科学及气象学]