摘要
On the basis of oceanographic data over years of the China seas,19 elements affecting the oceano are found with 91.06% of the accumulative ratio of their eigenvalue's variances to population variance,representing fully the original information. In order to polarize the loading values of every principal factor tending to 1 or 0,vari max orthogonal rotation to the loading matrix of 6 principal factors is made.The results indicate that the oceanic thermoregime plays a leading role in the first principal factor F1 The second principal F2 is affected mainly by seafloor relief.The other principal factors F3, F4, F5 adn F6 are influenced by the occurring 10-d period of the lowest monthly mean sea temperature,the annual mean value and range of sea surface salinity,and the latitude respectively.The physical cause for these climatic characteristics is very clear.According to the scores of 6 principal factors of every station. the cluster diagram on each pair of factor axis planes is drawn and the climatic field over the China seas preliminarily divided into 6 regions, namely, temperate climatic region (Ⅰ1) in the Bobai Sea and the Huanghai Sea, transitional subtropical climatic region (Ⅱ1) in the East China Sea, subtropical climatic region (Ⅱ2) of Kuroshio,subtropical climatic region (Ⅱ3)in the eddy area on the right side of Kuroshio,tropical climatic region (Ⅲ1) in the central South China Sea and equatorial tropical climatic region(Ⅲ2). The climatological characteristics of every region are analyzed. Besides,the division of climatic area of the China seas is made by using Q-type principal com ponent analysis. The results of R- and Q-type methods are identical. It is thus proved that this preliminary division of climatic area is reliable and valid,and may be taken as a basis for further division.
On the basis of oceanographic data over years of the China seas,19 elements affecting the oceano are found with 91.06% of the accumulative ratio of their eigenvalue's variances to population variance,representing fully the original information. In order to polarize the loading values of every principal factor tending to 1 or 0,vari max orthogonal rotation to the loading matrix of 6 principal factors is made.The results indicate that the oceanic thermoregime plays a leading role in the first principal factor F1 The second principal F2 is affected mainly by seafloor relief.The other principal factors F3, F4, F5 adn F6 are influenced by the occurring 10-d period of the lowest monthly mean sea temperature,the annual mean value and range of sea surface salinity,and the latitude respectively.The physical cause for these climatic characteristics is very clear.According to the scores of 6 principal factors of every station. the cluster diagram on each pair of factor axis planes is drawn and the climatic field over the China seas preliminarily divided into 6 regions, namely, temperate climatic region (Ⅰ1) in the Bobai Sea and the Huanghai Sea, transitional subtropical climatic region (Ⅱ1) in the East China Sea, subtropical climatic region (Ⅱ2) of Kuroshio,subtropical climatic region (Ⅱ3)in the eddy area on the right side of Kuroshio,tropical climatic region (Ⅲ1) in the central South China Sea and equatorial tropical climatic region(Ⅲ2). The climatological characteristics of every region are analyzed. Besides,the division of climatic area of the China seas is made by using Q-type principal com ponent analysis. The results of R- and Q-type methods are identical. It is thus proved that this preliminary division of climatic area is reliable and valid,and may be taken as a basis for further division.
