摘要
本文利用扩展的自然正交函数(EEOF)方法展开30百帕月平均高度、温度场,得到了前四个特征向量场、它们的方差贡献及结构特点;讨论了各特征向量场在冬、夏半年所代表的典型环流形势;最后用最大熵谱方法对时间系数作周期分析,揭示了各典型环流强度随时间变化的主要周期。
By the extended empirical orthogonal function (EEOF)method the 30 hPa mean monthly height and temperature fields areexpanded, yielding the first four eigenvector fields as well as theirvariance eontributions and structural characteristics. The circulationregimes typical of the eigenvector fields in winter and summer halfyears are described.At last periodicity analysis is made for time coeffi-cients by the maximum entropy spectrum method and the major periodsfor the change of the canonical circulation intensity with time are thus revealed.
出处
《南京气象学院学报》
CSCD
1991年第2期160-169,共10页
Journal of Nanjing Institute of Meteorology
基金
<长期天气预报理论
方法和资料库建立的研究>项目
关键词
北半球
平流层
平均高度
温度场
Stratosphere
geopotential height field
temperature field
extended empirical orthogonal function (EEOF)
maximum entropy spectrum
