Climatic division of snow cover environments in Japan using the mesh climatic data.

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  • メッシュ気候値から推定した日本の雪質分布
  • メッシュ キコウチ カラ スイテイシタ ニホン ノ ユキシツ ブンプ

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Snow cover environments in Japan are classified into four categories using the mesh climatic data. They are wet snow region, dry snow region, intermediate region and depth hoar region. The wet snow region is the region in which every layer of the deposited snow is wet due to percolation of snow melt water throughout the winter season. In this region snow cover is governed by the melt metamorphism even in the coldest period of winter season. The regions which are climatically colder than the wet region are divided into two snow-type regions, namely the depth hoar region where development of depth hoar is expected and the dry snow region.<BR>Areas where the monthly maximum snow cover depth in any month between December and March is greater than 10cm are examined using the mesh climatic data. Critical values of the monthly mean temperature dividing the wet snow region and dry snow region were determined from snow surveys. The regions that have a monthly mean temperature in January higher than 0.3°C in the mesh climatic data belong to the wet snow region and the region, in which the monthly mean temperature in January is lower than -1.1°C belong to the dry snow region. The regions with intermediate monthly mean temperature in January are classified as intermediate regions.<BR>The depth hoar region are decided from the empirical formula obtained by Akitaya and Endo (1982), substituting variables for the mesh climatic data.

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