【摘要】 采用连续小波变换和交叉小波变换方法,分析了北极涛动指数和河南省月降水距平序列的时频变化特征,并讨论了近50多年来北极涛动对河南省降水的可能影响。结果表明,北极涛动指数和河南省降水距平序列中都存在着不同时间尺度的周期振荡,且时域中的分布特征和振荡强度也不尽相同;两者之间在6~8 a、12~16 a和25 a以上尺度的周期振荡呈正相关,而在9~11 a和16~24 a尺度上表现为负相关关系。更多还原

【Abstract】 Using the continuous wavelet transform and the bivariate wavelet transform method,the time-frequency variation characteristics of Arctic Oscillation Index(AOI) and monthly precipitation departure series of Henan province are studied.The influence of Arctic Oscillation on precipitation of Henan province in recent 50 years is also investigated.Results show that there is periodic oscillation of different time scale.And there are different distribution characteristics and oscillation intensities of the periods in the time domain.The positive correlations between AOI and precipitation appear on the time scales of 6~8 a,12~16 a and 25 a above.The negative correlations of two series present on 9~11 a and 16~24 a scales.更多还原