集合经验模态分解在陕西降水多尺度分析中的应用

Multiscale analysis of precipitation in Shaanxi province based on ensemble empirical mode decomposition

根据1960—2009年陕西省陕北、关中、陕南3个地区的年降水量资料,利用集合经验模态分解方法进行了降水量变化的多时间尺度分析,探讨了影响陕西省3个区域降水量变化的因素。结果表明,在整个时间跨度,陕南地区"先升后降"的长趋势变化不同于陕北、关中地区保持递减的长趋势变化。尽管陕西省3个区域主要周期大小有一定的差别,但是都存在着10.5年左右的年代际周期,这个年代际周期与太阳黑子相对数11年的周期大致相同,说明了陕西省3个区域的降水可能受太阳黑子活动的影响。

Using the annual precipitation in northern,middle and southern Shaanxi from 1960 to 2009,the multiscale characteristics are researched based on the ensemble empirical mode decomposition,and the influencing factors of precipitation change of shaanxi province are discussed.Results indicate that the precipitation in northern and middle part of Shaanxi decreases slightly,but the precipitation in southern part increases at first and then decreases.Although there exists a different average period in three areas of Shaanxi Province,there is an average period of 10.5 years.Because both the precipitation of Shaanxi Province and the sunspots have about 11 years cycle.The conclusion indicates the precipitation of Shaanxi Province is influenced by the sunspot activity.