Snowfall variations in Japan and its linkage with tropical forcing

  • Ueda Hiroaki
    Faculty of Life and Environmental Sciences, University of Tsukuba

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Other Title
  • 冬季日本の降雪変動と熱帯からの遠隔強制


In this study, the causes of interannual variability of wintertime snowfall in the coastal plain facing the Sea of Japan over the past 33 years (1980-2012) are investigated. The observational evidence showed that intensified cold air intrusion from the Eurasian continent toward Japan in combination with anomalous cyclonic circulation favors in situ heavy snowfall. The composite analysis of the tropical convection during the heavy snow winters indicates that enhancement of convection in the vicinity of the Philippines, including the eastern Indian Ocean, is responsible for the emergence of anticyclonic circulation over the Asian continent and subsequent anomalous cyclonic circulation around Japan. 


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