FUZZY CLUSTER ANALYSIS OF THE NORTH PACIFIC SST AND ITS CONNECTIONS WITH THE SUBTROPICAL PACIFIC HIGH
北太平洋表层水温模糊聚类分析及其与北太平洋副热带高压的关系

Using the time coefficients of the empirical orthogonal decomposition for the north Pacific sea surface temperature (SST) anomalies, we adopted the method of fuzzy cluster to study the winter SST anomalies in the north Pacific for the period of 1949-1975. The result of the present study shows that the north Pacific SST anomalies in 26 winters can be divided into three modes which are correlated to the subtropical Pacific High (SPH). The meridional temperature difference decreases for the first and the third modes, which corresponds to the SPH weakened next summer, and increases for the second, which does to the SPH strengthened. It indicates that the variation of meridional SST difference in the north Pacific in winter is a very important factor for the changing of the SPH intensity next year. Conversely, the SPH plays an important role in changing the distribution of the north Pacific SST anomalies