中国冬季月平均气温异常的旋转EOF分析

ROTATE FOF ANALYSIS OF THE WINTER MONTHLY MEAN TEMPEKATER ANOMALY FOR CHINA

对中国冬季月平均气温标准化距平场做旋转经验正交函数分析，用前６个ＲＥＯＦ表示主要空间型，依次为华南型、东北型、西北西部型、青藏高原东部型、西南型和华北型。取对应的时间系数分析时间变化规律，结果表明，除青藏高原和华南不明显以外，其它地区呈现显著变暖趋势，前冬与后冬的距平以异号为主，在相同的周期变化中，西北的位相比青藏高原落后，比其他地区超前。

Abstract Performed in this paper is rotated EOF analysis of normalized anomaly fields of wintermonthly mean temperatures of China and the first six REOFs are taken to represent main spatialpatterns,1.e,of South China ,NE China ,western NW China ,eastern Tibetan Plateau ,SWChina and North China,Analvsis of their time coefficients for the related temporal evolutionsshows that 1) a remarkable warming trend occurs in other regions than the Tibetan Plateau andSouth China, 2) opposite signs of anomaly are dominant in the early and late winter’ and 3) theNW China pattern are in phase behind the Plateau pattern but ahead of the others when they arein the same period。Kevwords winter, monthly mean temperature anomaly, rotated empirical orthogonal function(REOF)