平流层下部气温年际异常的旋转主成分分析

A ROTATED PRINCIPAL COMPONENT ANALYSIS OF THE INTERANNUAL VARIABILITY OF TEMPERATURE IN THE LOWER STRATOSPHERE

利用旋转主成分方法分析了北半球冬季平流层下部月平均气温距平，得到的４个主要的空间分布型，分别表示中纬、低纬的纬向对称异常、太平洋北部暖中心和极区冷中心的异常。还指出中纬异常的时间演变最单调，整个冬季有持续性，年际变化呈现明显的准两年振荡周期（ＱＢＯ）。

Theinterannual variability of the temperature in the lower stratosphere is studiedby arotated principal component analysis.Four fundarnental spatial patterns have beenobtained,which represent zonally symmetrical anomalies in middle latitudes and in lowlatitudes,the warm center anomaly in theorthern Pacific and the cold center anomalynear north pole,respectively,Additionally,temporal evolution of anomalies in middlelatitudes is the most monotonous,the sign of anomalies is persistent for the wholewinter and the interannual evolution clearly shows the character of QBO。