地理科学进展 ›› 2010, Vol. 29 ›› Issue (11): 1340-1344.doi: 10.11820/dlkxjz.2010.11.016

• 气候与水文过程 • 上一篇    下一篇

1965—2005 年河北省降水量变化的小波分析

李春强1, 杜毅光1,2, 李保国2   

  1. 1. 河北省气象与生态环境重点实验室河北省气象科学研究所, 石家庄050021;
    2. 中国农业大学资源与环境学院, 北京100094
  • 收稿日期:2009-07-01 修回日期:2010-01-01 出版日期:2010-11-25 发布日期:2010-11-25
  • 作者简介:李春强(1964-)|男|汉族|山西芮城人|理学硕士|高级工程师|主要从事农业气象与气候变化研究
  • 基金资助:

    河北省应用基础研究计划重点基础研究项目(08966711D);河北省科技支撑计划项目( 09276903D)

A Wavelet Analysis on Annual Rainfall Variation in Hebei Province during 1965-2005

LI Chunqiang1, DU Yiguang1,2, LI Baoguo2   

  1. 1. Hebei Provincial Key Lab for Meteorology and Eco-environment, Meteorological Institute of Hebei Province, Shijiazhuang050021, China;

    2. College of Resources and Environment, China Agricultural University, Beijing 100094, China
  • Received:2009-07-01 Revised:2010-01-01 Online:2010-11-25 Published:2010-11-25

摘要:

降水变化对农业生产与经济社会发展具有重要意义。根据河北省85 个常规地面气象站降水资料,利用小波变换Morlet 方法,分析了河北省1965-2005 年不同时间尺度下降水序列的主要周期变化过程及其空间变化特征。结果表明:近41 年河北省年降水量主要存在3 个尺度的变化周期,分别是18a、8a 和4a,其中,18a 尺度存在于近41a,8a 尺度主要集中在20 世纪90 年代,4a 尺度集中在70 年代。在时间上,18a 尺度经历了5 个枯丰交替变化;8a 尺度上则有10 个丰枯交替。在空间上,不同地区降水的多时间尺度特征具有明显的差异,河北省北部和中东部地区年降水量分别以12 ~ 18a 大尺度及8 ~ 12a 中尺度周期变化为主,降水相对稳定;西部地区则主要以3-8a 小尺度周期变化为主,降水变率较大。

关键词: Morlet, 河北省, 降水变化, 小波分析

Abstract:

Rainfall temporal-spatial variations are very important for the development of agriculture production and social-economy. Based on the precipitation data of 85 surface weather stations in Hebei province from 1965 to 2005, the annual rainfall change characteristics under different time scales were analyzed by the Morlet wavelet analysis method. The results showed that three periodic oscillations (18-year, 8-year and 4-year) existed in the annual rainfall variation, and 18-year scale mainly in the 41-year period, but 8-year in the 1990s and 4-year in the 1970s. Also, there were 5 dry-wet processes for the 18-year scale and 10 dry-wet processes for the 8-year scale. A clear distinction for multi-time scales characteristics of annual rainfall occurred in different spatial areas. The large-scale of 12-18 years and meso-scale of 8-12 years were revealed in the northern and central-eastern parts respectively, while a small-scale of 3-8 year period was found in the western part of Hebei province.

Key words: Hebei province, morlet, rainfall variation, wavelet analysis