青藏高原不同季节地表温度变化特征分析

Characteristics of seasonal surface temperature variation over the Tibetan Plateau

基于欧洲中尺度气象预报中心(ECMWF)提供的ERA-Interim地表温度,利用经验正交函数(EOF)等方法,分析了青藏高原四季地表温度的时空变化特征.结果发现:青藏高原春、夏、冬季地表温度变化以整体型为主,并且大部地区地表温度呈现升高的趋势;秋季地表温度略有下降趋势,并且以东部和西部地表温度的反向型异常变化最为显著.此外还发现,青藏高原不同季节地表温度的异常变化具有一定的联系,其中整体型变化可以持续3个季节.

The ERA-Interim surface temperature data from European Centre for Medium Range Weather Forecasts （ ECMWF） are used to analyze the spatial and temporal variation of the seasonal surface temperature over the Tibet-an Plateau using Empirical Orthogonal Function（EOF）.The results show that in spring,summer and winter,the sur-face temperature tends to increase in the whole Plateau without obvious spatial variation;while in autumn,surface temperature tends to decrease slightly in most area,and a significant opposite variation trend exists between the east-ern and western area of the Plateau. In addition,there are some definite relations between the surface temperature anomaly variations in different seasons,and the integral type can last for 3 seasons.