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）
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概要
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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.
著者
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MATOBA Sumito（的場澄人）
Institute of Low Temperature Science, Hokkaido University
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HACHIKUBO Akihiro（八久保晶弘）
Environmental and Energy Resources Research Center, Kitami Institute of Technology
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HORI Masahiro（堀雅裕）
Earth Observation Research Center, Japan Aerospace Exploration Agency
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AOKI Teruo（青木輝夫）
Meteorological Research Institute
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TANIKAWA Tomonori（谷川朋範）
Earth Observation Research Center, Japan Aerospace Exploration Agency
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KUCHIKI Katsuyuki（朽木勝幸）
Meteorological Research Institute
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NIWANO Masashi（庭野匡思）
Meteorological Research Institute
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YAMAGUCHI Satoru（山口悟）
Snow and Ice Research Center, National Research Institute for Earth Science and Disaster Prevention
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ARAKAWA Hayato（荒川逸人）
YAGAI-KAGAKU Co., Ltd.
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SUGIURA Konosuke（杉浦幸之助）
Center for Far Eastern Studies, University of Toyama
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