北半球30百帕月平均高度、温度场典型特征的结构和演变
投稿时间:1989-11-11    点此下载全文
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作者单位
葛玲 南京气象学院气象学系 
章基嘉 国家气象局 
李川 四川省气象台 
基金项目:《长期天气预报理论、方法和资料库建立的研究》项目
中文摘要: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。
中文关键词:平流层  位势场  温度场  扩展的自然正交函数  最大熵谱
 
STRUCTURE AND EVOLUTION OF THE CANONICAL CHARACTERISTICS OF THE NORTHERN 30 hPa MEAN MONTHLY HEIGHT AND TEMPERATURE FIELDS
Abstract:By the extended empirical orthogonal function (EEOF)method the 30 hPa mean monthly height and temperature fields are expanded, yielding the first four eigenvector fields as well as their variance eontributions and structural characteristics. The circulation regimes typical of the eigenvector fields in winter and summer half years are described.At last periodicity analysis is made for time coefficients by the maximum entropy spectrum method and the major periods for the change of the canonical circulation intensity with time are thus revealed.
keywords:Stratosphere  geopotential height field  temperature field  extended empirical orthogonal function (EEOF)  maximum entropy spectrum
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