Item: Quick growth of depth hoar in a surface layer
Title: Quick growth of depth hoar in a surface layer
Proceedings: 1990 International Snow Science Workshop, Bigfork, Montana USA, October 9-13
Authors: Takuya FUKUZAWA and Eizi AKITAYA
Abstract: The quick growth of a weak layer of depth hoar in a surface layer was observed on a mountain slope in northern Hokkaido, Japan. When the weather becomes clear after the deposition of a thin (less than 3 cm) new snow layer on denser and older snow, the temperature of the dense snow rises under calm sunny weather by the absorption of solar radiation in the day time. After sunset the surface temperatures of new snow drops rapidly by radiative cooling and a large temperature gradient (2 C/cm) appears in the new snow, just beneath the surface. It was determined that such a large temperature gradient overnight resulted in the quick growth of depth hoar at the new snow surface layer.
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Keywords: surface layer, hoar layer, temperature, radiation
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