北半球500hPa月高度距平场的球函数谱结构

SPECTRAL STRUCTURE OF SPHRRICAL FUNCTIONS FOR MONTHLY ANOMALY FIELDS OF NORTHERN 500 hPa HEIGHT

给出了用场集球函数展开系数分析其距平场集模方球函数谱结构的方案。用１９５１～１９８６年１、７月北半球５００ｈＰａ高度场球函数展开系数，分析了距一场的球函数谱结构。结果表明，它们具有低维、低阶的特点，距平环流的基本特征及季节、年际变化可以用不足５０个球函数分量较精确地描述。

This paper presents a scheme for analyzing the spectral structure of spherical functionsof squared norm of anomaly field set using the coefficients of the function expansion,wherewithanalysis is implemented of northern 500 hPa height for January and July in 1951～1986,separately. Results show that the spectral structure of the anomaly sets is characterized by low-dimension and low-order,and the salient features of the anomaly circulations and their seasonal/interannual variations can be accurately described in virtue of less than 50 components of thefunctions.