主成分分析とクラスター分析による中国東北地方の気候区分

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Climatic division of the Northeast China was tried using the principal component (P.C.) analysis and the cruster analysis of monthly mean air temperature and monthly precipitation at 35 meteorological observatories and stations for 18 years (1961-1978). 1) The result of the P.C. analysis of monthly mean air temperature showed that the first three principal components can explain more than 85% of total variance (Table 1), and each component represents the distribution patterns of air temperature as follows. 1st P.C.: "hot over the entire area" or "cool over the entire area" 2nd P.C.: "hot in north and cool in south areas" or "cool in north and hot in south areas" 3rd P.C.: "hot in east and cool in west areas" or "cool in east and hot in west areas" 2) The result of the P.C. analysis of monthly precipitation showed that the first four principal components can explain about 60%o of total variance(Table 2), and each component represents the distribution patterns of precipitation as follows. 1st P.C.: "wet over entire area" or "dry over entire area" 2nd P.C.: "wet in north and dry in south areas" or "dry in north and wet in south areas" 3rd P.C.: "wet in mountains 4nd dry in plains" 4th P.C.: "wet in east and dry in west areas" or "dry in east and wet in west areas" 3) Through the cluster analysis of the first three factor loading of air temperature, the Northeast of China was divided into two first order climatic regions with the line drawn from the central part of the Daxinganling Mts. to the north part of Changbaishan Mts. (Fig. 5). 4) The result of same analysis as air temperature for precipitation indicated that the Northeast was divided in two first order climatic regions, the one is relatively small area near the Liaodao Peninsula and the other is the wide area remained, and in six subregions (Fig. 7). 5) The first three factor loadings of air temperature and precipitation were analyzed together using the cluster analysis. The results showed that the Northeast was divided into two first order climatic regions with the line drawn from the central part of the Daxinganling Mts. to the southern end of the Xiaoxinganling Mts. and the eight subregions (Fig. 9).
北海道大学の論文
1986-03-21

主成分分析とクラスター分析による中国東北地方の気候区分

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