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*Makoto Shimamura
Graduate School of Environmental Science, Hokkaido University
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Kou Shimoyama
Institute of Low Temperature Science, Hokkaido University
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Masaki Nemoto
Snow and Ice Research Center, NIED
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Atsushi Sato
Graduate School of Environmental Science, Hokkaido University Snow and Ice Research Center, NIED
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Tsutomu Watanabe
Institute of Low Temperature Science, Hokkaido University