Formation processes of basal ice at Hamna Glacier, Sôya Coast, East Antarctica, inferred by detailed co-isotopic analyses

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概要

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• Debris-laden basal ice is exposed along an ice cliff near Hamna Glacier, Sôya Coast, East Antarctica. The basal ice is about 6.8m thick and shows conspicuous stratigraphic features. The upper 5.5m consists of alternating layers of bubble-free and bubbly ice. δ values of the bubble-free ice layers are enriched by 2.4 ± 1.0‰ (standard deviation) for δ18O compared to values of neighboring bubbly ice layers above, and slopes of δ18O vs δD are close to 8. Such layers are suggested to have been formed by refreezing of meltwater in an open system. In contrast, part of the bubbly ice layers shows neutral profiles for stable isotopes, suggesting that these ice masses are undisturbed ice-sheet ice which was not affected by melting and freezing. The massive alternating layers are thus considered to have been formed by folding of refrozen and non-melted layers. The lower 1.3m consists predominantly of bubble-free massive ice. The profile of co-isotopic values shows a change of about 3.0‰ for δ18O at the interface between bubble-free and bubbly ice. Since the isotopic change occurred over a wider thickness than the upper 5.5m, the basal ice is suggested to have been formed by refreezing of meltwater on a larger scale than the upper 5.5m.

• International Glaciological Societyの論文

著者

• Iizuka Yoshinori

  Institute Of Low Temperature Science Pan-okhotsk Research Center Hokkaido University

• Shiraiwa T

  Disaster Prevention Research Institute Kyoto University

• Saito T

  Institute Of Low Temperature Science Hokkaido University

• Takahashi Shuhei

  Department Of Civil Engineering Kitami Institute Of Technology

• Shiraiwa Takayuki

  O Faculty Of Science Tokyo Institute Of Technology

• Naruse Reij

  Institute Of Low Temperature Science Hokkaido University

• Naruse R

  Institute Of Low Temperature Science Hokkaido University

• Iizuka Y

  Department Of General Education Yuge National College Of Maritime Technology

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