山西省春季降水异常时空特征研究

采用主成分分析(EOF)、旋转主成分分析(REOF)、小波分析方法,对山西省1960~2004年春季降水标准化距平场进行分区,并对春季降水异常的空间分布特征、时间变化规律进行分析。结果表明:山西省春季降水的主要空间异常型表现为全省一致的多雨或少雨型,这是山西省春季降水异常的主要特征。降水异常区域大致可划分为3个区,即北部区、中部区、南部区。各异常区春季降水都存在10 a以上长周期和3~10 a短周期振荡,但其显著周期及其年代变化差异较大。

Analysis on temporal and spatial features of spring precipitation anomalies in Shanxi Province

Using the methods of empirical orthogonal function(EOF),rotated empirical orthogonal function(REOF) and wavelet analysis,this paper zones the standardized spring precipitation field of Shanxi Province during 1960 to 2004,and analyzes the temporal and spatial features of spring precipitation.The results show that the main spatial anomaly feature is coincidently wet or dry type,and the whole province can be divided into 3 climate regions in accordance with spring precipitation.There are oscillations of spring precipitation with over 10a long-term and 3~10a short-term periods in all climate regions,but their obvious periods and annual changes are much different from each other.