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Department of Earth Science Education, Chonnam National University, Gwangju 500-757, KoreaAbstract: In this study, we classify the 1000 hPa geopotential height fields around the Korean peninsula through the K-means cluster analysis and investigate the occurrence characteristics of each cluster pattern. The 11 clusters are identifiedas the typical pressure patterns, applying the pattern correlation as a similarity among clusters and the criterion of clustersimilarity 0.8, of which three pressure patterns are associated with the extension of Siberia air mass, other three with thelatitudes of the longest symmetry axis of North Pacific highs, two with the trough largely under the air mass of Siberiaor North Pacific, and the remaining three, the migratory high patterns generally occurring in spring and autumn, aredisjointed according to the direction of the longest symmetry axis of highs. The occurrence rate of air masses affectingthe Korean peninsula, estimated from the number of occurrence days of 11 pressure patterns, is 55.4% Siberian, 29.3%North Pacific, 12.8% Yangtze-River, 2.5% Okhotsk sea and 68.2% of all these is the continental air masses. Thewintertime pressure patterns around the Korean peninsula are nearly contrary to those in summertime, each dominated bythe highs extended from the stationary air masses over the Central Siberia and the North Pacific ocean. The migratoryhighs occur largely in spring and autumn while transferring from the wintertime patterns to summertime patterns, or viceversa. Recently, the occurrence frequency of the highs extended from the North Pacific is on the decrease and while thewintertime pressure patterns occur frequently in spring and autumn, the occurrence frequency of the pressure patterns withtrough is on the increase and the migratory highs occur in nearly all seasons.Keywords: typical pressure patterns, K-means cluster analysis, pattern correlation, air mass, migratory high:   1000 hPa    K-      ,   .          ,   0.8     11 .         3,      3,         2,          3 .             55.4%,  29.3%,   12.8%,   2.5% ,      68.2% .                     ,       .        .              ,        .:   , K- ,  , ,

Cluster Analysis of the 1000-hPa Height Field around the Korean Peninsula