基于EEMD的杜尚别市1950-2013年降水多尺度分析  

Multi-scale fluctuation of precipitation in Dushanbe revealed by EEMD analysis

作　　者：吴燕锋[1] 巴特尔.巴克 李维[1] 魏小琴[1] Rasulov H H 

机构地区：[1]新疆农业大学草业与环境科学学院,乌鲁木齐830052 [2]塔吉克农业大学水文气象系,杜尚别734003

出　　处：《干旱区资源与环境》2015年第6期152-157,共6页Journal of Arid Land Resources and Environment

基　　金：2014年度新疆研究生科研创新项目(XJGRI2014079);国家国际科技合作计划项目(2010DFA92720-13);新疆维吾尔自治区土壤学重点学科资助

摘　　要：文中采用集合经验模态分解(EEMD)方法,对杜尚别市1950~2013年的降水量进行了多尺度分析。结果表明:过去64年杜尚别市年降水量存在明显的年际和年代尺度的变化,年际尺度的周期为4年和6.5年和年代尺度的周期为12年和27年,其中1950s^1980s呈减少趋势,在1990s^2000s呈增加趋势,且后期的增幅大于前期的减幅。四季中,春季和夏季的降水量呈增加趋势,秋季和冬季的降水量呈减少趋势。Precipitation can affect the land surface,vegetation communities and ecosystem services. The data of precipitation from 1950 to 2013 in Dushanbe of Tajikistan was performed by the method of ensemble empirical mode decomposition（ EEMD）. The decomposed results indicated that there were two main time scales,e. g. inter-annual and inter-decadal scales,with the period of 4 years,6. 5 years and 12 years and 27 years,respectively. The precipitation changed from decreasing trend during 1950 s ～ 1980 s and significantly increasing trend during 1990 s ～ 2000 s. The precipitation in spring and summer presented decreasing trend but presented increasing trend in autumn and winter.

关 键 词：降水量 集合经验模态分解(EEMD) 多尺度分析 杜尚别市 

分 类 号：P468[天文地球—大气科学及气象学]