摘要
Wavelet analysis is used to study the interannual and interdecadal variationsof rainfall in China and atmospheric circulation factors, including the key atmosphericoscillations, W, C, E patterns and subtropical high. Regression analysis and correlation analysisare both used to study the relationship of atmospheric circulation factors and China rainfall ondifferent time scale and spatial scale. The results are as follows: (1) The variations ofatmospheric circulation and rainfall in China are characterized by interannual and interdecadalscales. The variations of atmospheric circulation and rainfall are composed of interannual andinterdecadal variations. It is necessary to separate those two time scales when climate changes andforecast are studied. (2) The variations of China rainfall are due to the interaction ofmulti-factors rather than single factors. The marked factors which influence the interannual andinterdecadal variations are various. Subtropical high is one of the marked factors which influenceinterannual variations of rainfall, while AO, NAO, and NPO are one of the marked factors whichinfluence interdecadal variations of rainfall. (3) The longer the time scale is, and the larger thespatial scale is, and the more remarkable the relationships between atmospheric circulation andrainfall are.
Wavelet analysis is used to study the interannual and interdecadal variationsof rainfall in China and atmospheric circulation factors, including the key atmosphericoscillations, W, C, E patterns and subtropical high. Regression analysis and correlation analysisare both used to study the relationship of atmospheric circulation factors and China rainfall ondifferent time scale and spatial scale. The results are as follows: (1) The variations ofatmospheric circulation and rainfall in China are characterized by interannual and interdecadalscales. The variations of atmospheric circulation and rainfall are composed of interannual andinterdecadal variations. It is necessary to separate those two time scales when climate changes andforecast are studied. (2) The variations of China rainfall are due to the interaction ofmulti-factors rather than single factors. The marked factors which influence the interannual andinterdecadal variations are various. Subtropical high is one of the marked factors which influenceinterannual variations of rainfall, while AO, NAO, and NPO are one of the marked factors whichinfluence interdecadal variations of rainfall. (3) The longer the time scale is, and the larger thespatial scale is, and the more remarkable the relationships between atmospheric circulation andrainfall are.
基金
Supported by the Yunnan Key Project (2003D0014Z)the National Natural Science Foundation of China under Grant No. 40065001.
