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*Chiaki Ikawa
Department of Polar Science, The Graduate University for Advanced Studies
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Yoichi Motoyosi
Department of Polar Science, The Graduate University for Advanced Studies National Institute of Polar Research
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Tomokazu Hokada
Department of Polar Science, The Graduate University for Advanced Studies National Institute of Polar Research
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Kenji Horie
Department of Polar Science, The Graduate University for Advanced Studies National Institute of Polar Research