青森市の降雪特性

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書誌事項

タイトル別名
  • On the characteristics of snowfall at Aomori City.
  • アオモリシ ノ コウセツ トクセイ

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抄録

Meteorological data obtained from surface observations at the meteorological stations in Aomori Prefecture and upper air observations at Akita station have been analyzed statistically in order to study the characteristics of snowfall at Aomori City. The major findings are as follows. First, the snowfall at Aomori generally shows poor correlations with that at other stations, suggesting that the snowfall at Aomori is rather independent of that at other stations. Next, the snowfall at Aomori shows high correlations with the upper air conditions above Akita station : the heavy snowfall is associated with the advection of cold air and with the upward transport of water vapor by the convective mixing at lower layers. In addition, the snowfall at Aomori is also highly correlated with the surface meteorological conditions. Namely, the amount of snowfall increases with decreasing temperature and increasing wind speed. The snow is mostly carried by the southwesterly winds.<BR>The high correlations with the upper and surface air conditions are peculiar to Aomori station and are not seen at other stations. The high correlation with the upper air conditions implies that the snow falling at Aomori is generated in the vicinity of a hgih mountainous region. The high correlation with the surface are conditions implies, on the other hand, that the air with a low temperature and strong wind is always associated with an upward flow at a windward area of Aomori, and the snowflakes generated at the high mountain area are transported by favorable winds to Aomori. Since the wind carrying the snowflakes is mostly southwesterly, the area which generates the snowflakes is considered to be above the western or northwestern flank of Hakkoda Mountains. In other words, the snow falling at Aomori is basically mountain snow which forms near the Hakkoda Mountains and is transported by the southwesterly winds toward Aomori.

収録刊行物

  • 雪氷

    雪氷 51 (4), 253-264, 1989

    公益社団法人 日本雪氷学会

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