Multi-time Scale Analysis of the Precipitation Series in Chengde City in Recent 58 Years

• 作者: CHENG Fu-wei MENG Xian-feng YANG Yi-tian ZHANG Cai-yu ZHANG Yue-cong
• 来源期刊: 气象与环境研究：英文版
• 学科: 地球科学
• 关键词: 多时间尺度分析 降水序列 承德市 小波分析 高频振荡 降水周期 多尺度特征 月降水资料
• 年，卷（期）: 2012,（1）
• 页码范围: 21-25
• 页数: 5页
• 分类号: P425.42

摘要

[Objective] The research aimed to analyze variation rule of the precipitation series in Chengde City in recent 58 years.[Method] Mexican hat wavelet was used to analyze multi-scale characteristics of the monthly precipitation data in Chengde from 1951 to 2008.We revealed multi-time-scale complex structure of the precipitation change in Chengde,analyzed change cycles and mutation points of the precipitation series under different time scales,and identified primary period in each series.[Result] There were high/low value centers of the precipitation under interdecadal scale(more than 10 years).Under interannual scale(below 10 years),oscillation was complex and variable,but 4-year scale had obvious high-frequency oscillation.Wavelet variance analysis verified existence of the 4-year precipitation cycle,and M-K test also confirmed conclusions of the wavelet analysis.[Conclusion] We could judge from alternating wet and dry conditions that the wet year decreased significantly,and the current precipitation was still less than normal.