Interannual Variation in Snow-accumulation Events in Tokyo and its Relationship to the Eurasian Pattern

DOI Web Site 被引用文献3件 参考文献10件
  • Tachibana Yoshihiro
    Institute of Observational Research for Global Change, JAMSTEC
  • Nakamura Tetsu
    Graduate School of Earth and Environmental Science, Tokai University
  • Tazou Nobuhiro
    Department of Aeronautics and Astronautics, Tokai University East Japan Railway company

抄録

We examined interannual variation in snow-accumulation events in Tokyo and the relationship of this variation to large-scale atmospheric patterns. Years when snow-accumulation events occurred tended to coincide with a west-to-east wavetrain pattern in the middle and upper troposphere over Eurasia. The pattern, which includes cyclonic anomalies over Europe and East Asia and anticyclonic anomalies over Siberia, is identical to the negative phase of the Eurasian (EU) pattern, which is the leading mode of an empirical orthogonal function (EOF) analysis applied for the Eastern Hemisphere in the 500-hPa height field. Anomalous cold air associated with the negative EU pattern widely covers East Asia and Japan in the lower troposphere. No significant relation to storm-track activities around Japan was found except for extremely deep snowfall years. The cold atmospheric anomaly associated with the negative EU pattern possibly lowers the surface air temperature over Tokyo, creating an environment favorable to snowfall and snow accumulation. In the extremely deep snow years, the signature of the EU pattern was weak, and storm tracks over the ocean to the south of Japan were significantly active. No clear long-term trend in snow-accumulation events was found, although a downward trend due to anthropogenic effects was expected.

収録刊行物

  • SOLA

    SOLA 3 129-132, 2007

    公益社団法人 日本気象学会

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