关键词: 气候学, 降水, 多窗口谱分析, 交叉小波, 华东地区

Abstract: According to the monthly precipitation data from 1951 to 2010 of 32 sites in east China, and based on the study of the precipitation cycle characteristics in east China with Multi taper Method (MTM) and wavelet analysis method, sunspots, related circulation indices such as Southern Oscillation Index, and precipitation series were used for cross wavelet analysis to discuss the main factors influencing the precipitation cycle characteristics of east China. The results showed that the precipitation in east China had prominent cycles both on interannual and interdecadal scales, among which 11.6~12.3 years cycle(interdecadal scale) was the most significant, following by 6.0 years cycle and 4.0 years cycle (interannual scale), and different cycles influences on the precipitation were related to different periods. Among all the factors which had significant influences on the precipitation cycles of east China, sunspot activity had the most prominent impact, which was mainly reflected in the precipitations 12 years cycle; the Southern Oscillation Index, the Subtropical HighIntensity Index of West Pacific and the Subtropical HighIntensity Index of South China Sea also have evident influences on the precipitation of east China, which were reflected in the precipitations 12 years cycle and 2~8 years cycle. 

Key words: Climatology, Precipitation, Multi taper Method, Cross wavelet, East China