热带海表温度及北大西洋涛动与ENSO事件的相关分析

Analysis of Correlation between Tropic SST and NAO and ENSO Events

采用交叉小波变换方法分析了热带SST、NAO与ENSO事件之间的多时间尺度相关特征.结果表明,热带SST与ENSO事件在2～7年和30年以上尺度的周期振荡上存在着显著的同位相正相关,其中以4年尺度周期的方差贡献最大,时域中热带SST冷暖变化的时间与ENSO冷暖交替的时间一一对应;北大西洋SST与ENSO事件在4年和15年尺度周期振荡上表现为方差贡献较大的正相关;NAO与ENSO事件相关较弱,在2～7年和10～24年尺度上表现为负相关,而25年以上尺度为正相关,时域中NAO强弱变化与ENSO冷暖交替的对应关系并不完全一致.

The correlation between tropic sea surface temperature of global and NAO and ENSO events were studied by means of bivariate wavelet analysis. Results show that the correlation between tropic SST and ENSO cycle on the time scales of 2 to 7 years and over 30 years is apparent with the maximum variance contribution appearing at the period of 4 years. The most striking correlation between North Atlantic SST and ENSO events was found on the time scales of 4 years and 15 years. There is weak anticorrelation between NAO and ENSO events on the time scales of 2 to 7 years and 10 to 24 years, and weak correlation on over 25 year scale.