気候変動にともなう大雪山での氷河の形成について

概要

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Serveral perennial snow patches of the order of 100 m in length are found in some valleys in Mt. Daisetsu, Hokkaido. Glaciological studies have been made for the past ten years on several snow patches located near the top of the slope curved on the east side of a plateau called “Takanegahara” (1730 m in altitude). On the basis of the observational results on the accumulation of snow in this area, calculations were made to obtain the climatic conditions in which small perennial snow patches on the slope grow to become a glacier.<BR>Climatic conditions needed to form a glacier were estimated as functions of accumulation of snow and the average air temperature. The size, the thickness and the flow velocity of the “predicted glacier” were computed, taking Nye's theory of glacier flow into account. It was found, for example, that 3040% of the present snow accumulation was enough to form a glacier on this slope during the last Pleistocene Ice Age. At the equilibrium line of the “glacier”, flow velocity of 10 m/year and ice thickness of 3040 m were obtained in the present calculation.
社団法人日本雪氷学会の論文