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Suncup (snow) : ウィキペディア英語版
Suncup (snow)

Suncups are bowl-shaped open depressions into a snow surface, normally wider than they are deep. They form closely packed, honeycomb, often hexagonal patterns with sharp narrow ridges separating smoothly concave hollows. For a given set of suncups, the hollows are normally all around the same size, meaning that the pattern is quasi-periodic on 20–80 cm scales.〔Post, A., and LaChapelle, E.R. 1971. Glacier ice. Seattle and London, University of Washington Press.〕〔Herzfeld, Ute C., et al. "Morphogenesis of typical winter and summer snow surface patterns in a continental alpine environment." Hydrological processes 17.3 (2003): 619-649.〕 The depressions are typically 2–50 cm deep.〔Rhodes, Jonathon J., and Stephen G. Warren. "MODE OF FORMATION OF ABLATION HOLLOWS CONTROLLED BY DIRT CONTENT OF SNOW." ''Journal of Glaciology'' 33.114 (1987).〕
Suncups form during the ablation (melting away) of snowy surfaces. It is thought they can form in a number of different ways. These include melting of clean snow by incident solar radiation in bright sunny conditions,〔 but also during melting away of dirty snow under windy or overcast conditions, during which particles in the snow accumulate on the crests between hollows, insulating them.〔Betterton, M. D. "Theory of structure formation in snowfields motivated by penitentes, suncups, and dirt cones." Physical Review E 63.5 (2001): 056129.〕
==See also==

* Penitentes, another snow ablation texture

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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