地理科学 ›› 1984, Vol. 4 ›› Issue (3): 225-234.doi: 10.13249/j.cnki.sgs.1984.03.225

• 论文 • 上一篇    下一篇

东北地区降水分布特性的主成分分析

赵焕宸   

  1. 中国科学院长春地理研究所
  • 出版日期:1984-05-20 发布日期:1984-05-20

AN ANALYSIS OF PRINCIPAL COMPONENTS FOR DISTRIBUTIVE CHARACTERISTICS OF PRECIPITATION IN NORTHEAST CHINA

Zhao Huanchen   

  1. Changchun Institute bf Geography, Academia Sinica
  • Online:1984-05-20 Published:1984-05-20

摘要: 主成分分析是一种多变量数学分析方法之一。这种方法,在气象现象解析上的应用,最早是 Loretz,E.N.在1956年对北美海面上的空间气压场的解析。之后,如陆续有气压(Kutzbach,J.E.,1967,1970)、气温(三上,1975)、风(Barnett,T.P.,1977)、降水(北岛,1981)等各种气象要素的主成分分析,论述了各种气象要素水平分布的优势型及其时间变动特性。

Abstract: The basic patterns of the deviation distribution of annual precipitation in the Northeast China were defined objectively through the principal component analysis of monthly precipitation from January to December (1961-1978) in 35 meteorological observatories or stations of the Northeast.The eigenvalues and distributive features of precipitation deviation are presented in Table 1 and Fig.1.The first,second and fourth principal components represented wet or dry patterns of the whole area,the pattern of north wet-south dry or north dry -south wet,the pattern of east wet-west dry or east dry-west wet,respectively. The third principal component represented different local precipitation deviation. The author made a dynamic investigation on the formations reasons and processes of dominant patterns of precipitation deviation (Fig.2 and Fig.3) based on the result of principal component anatysis of moathly mean air pressure,and also approached the changing time characteristics of precipitation deviation and reasonally climatic changing differences in the Northeast China (Fig.4 and Fig.5) through the analysis of scoring time-series each month and each year.In order to reveal fully the precipitation differences within the region further,the climatic region-alization of precipitation distributive pattern was carried out with the principal component cluster analysis (Fig.7) and the regional climatic characteristics were clear.Therefore the scientifc basis could be provided for rational arrangement of agriculture,forestry,animal husbandry,production of by-product and fishery.