Bulletin of Glaciological Research
Online ISSN : 1884-8044
Print ISSN : 1345-3807
ISSN-L : 1345-3807
Effects of temperature and grain type on time variation of snow specific surface area(積雪比表面積の時間変化に及ぼす温度および雪質の影響)
HACHIKUBO Akihiro(八久保晶弘)YAMAGUCHI Satoru(山口悟)ARAKAWA Hayato(荒川逸人)TANIKAWA Tomonori(谷川朋範)HORI Masahiro(堀雅裕)SUGIURA Konosuke(杉浦幸之助)MATOBA Sumito(的場澄人)NIWANO Masashi(庭野匡思)KUCHIKI Katsuyuki(朽木勝幸)AOKI Teruo(青木輝夫)
ジャーナル フリー

2014 年 32 巻 p. 47-53


The specific surface area (SSA) of snow is of particular interest to researchers because SSA is strongly related to snow albedo and is a comparatively better indicator of snow’s complexity than grain size. The time variation of SSA for fresh snow samples was observed in the laboratory under isothermal conditions at 226 K and 254 K using the gas adsorption method and Brunauer-Emmett-Teller theory. The SSA of the snow samples decreased with time under isothermal metamorphism. The decrease in SSA was fitted with the logarithmic equation proposed by Legagneux et al. (2003), and adjustable parameters were obtained. The rate of decrease in SSA depended on the shape of the initial snow type and temperature. Dendritic snow samples exhibited large initial SSAs, and their SSAs decreased faster compared with those of fragmented (collected from drifting snow) and plate-like precipitation particles with relatively small initial SSAs. The rate of decrease in SSA was lower at 226 K than that at 254 K.

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