LONG-TERM VARIABILITY OF WINTER EXTRATROPICAL CYCLONES AROUND JAPAN BASED ON JRA-55 ANALYSIS

Abstract

 Since explosively developed extratropical cyclones often cause severe damages to coastal area around the Japan Sea in winter, the long-term assessment of winter extratropical cyclones is required for engineering purpose. However, extratropical cyclones around Japan have not been understood well about intensity, frequency and etc. An algorithm of extracting extratropical cyclones from the atmospheric data of JRA-55 was developed and the extratropical cyclones have been analyzed from the viewpoints of correlation with teleconnection patterns and cluster analysis of tracking data.