中国秋季月平均气温特征及其异常研究

利用１９５１—１９９０年９—１１月月平均气温标准化距平资料，采用旋转主成分分析方法，研究中国秋季月平均气温的时空异常特征。结果表明，４０年来全国有６个主要气温变化异常区，均表现出程度不同的暖—冷—暖的演变趋势，在气温距平易号的演变过程中，东北突变最早，长江中下游最晚。

A Study of the Features and Anomalies of the Monthly Mean Temperature in Autumn of China

In this paper,Arotated principal component analysis of the normalized anomalyfields of the monthly mean temperature of China in the Autumnes(Sept.to Nov. )of 1951 to1990 has been performed. The spatial basic structure of anomalv of the monthly mean tem-perature in the Autumn of China was reflected by using the first two loading vectors. Thefirst six leading rotated loading vectors represent the six main spatial patterns,i.e. North-east China pattern, Middle lower reaches of Yangtze River Pattern, Hetao Pattern, North-west China Pattern, Tibet Plateau Pattern and South China Pattern respectively. The analy-sis of the time evolution rule of the corresponding rotated principal components reveals thereis a distinct temperature changing trend that is Warm cold Warm processes in the sixmain areas of temperature anomaly. In the processes of the temperature anomaly changesign, the earlist of abrupt change is Northeast China and middle lower reaches of Yangtzemver is later in China.