Reassessment of climatic conditions in“depth-hoar region“ and new map for climatic division of snow-covered areas in Japan based on the new conditions

ISHIZAKA Masaki

doi:10.5331/seppyo.70.1_3

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Other Title

「しもざらめ雪地域」の気候条件の再検討による日本の積雪地域の質的特徴を表す新しい気候図
シモザラメユキチイキノキコウジョウケンノサイケントウニヨルニホンノセキセツチイキノシツテキトクチョウオアラワスアタラシイキコウズ

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Description

The depth-hoar region is one of the categories introduced by the author for the climatic division of the snow-covered areas in Japan based on the snow-cover character in mid-winter. In this study, to clarify the climatic implications of the definition of the depth-hoar region, we determined the number of winter seasons in which depth hoar developed to a significant level that was distinguishes the depth-hoar region from the others and that corresponds to a new definition, observation sites for the 30 years from 1971 to 2000, and were analyzed using the diagnostic formula introduced by Akitaya and Endo (1982). As a result, we could derive a new climatic condition that distinguishes the depth-hoar region from the others and that corresponds to a new definition, representing the frequency of “depth hoar developing significantly in the winter season” over the 30 years. We also present a new digital cartographic map for climatic division that reflects the new definition for the depth-hoar region, using Mesh Climatic Data 2000, newly developed mesh climatic data published by Japan Meteorological Agency.

Journal

Journal of the Japanese Society of Snow and Ice

Journal of the Japanese Society of Snow and Ice 70 (1), 3-13, 2008

The Japanese Society of Snow and Ice

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