カムチャツカ半島ウシュコフスキー氷冠における雪氷コア掘削

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書誌事項

タイトル別名
  • Ice core drilling at Ushkovsky ice cap, Kamchatka, Russia.
  • カムチャツカ ハントウ ウシュコフスキーヒョウカン ニ オケル セッピョウ コア クッサク

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説明

Ice-core drilling and in situ ice-core analyses were carried out at Ushkovsky ice cap, Kamchatka, Russia. After transporting approximately 2.4 tons of a drilling system and camping equipments to the summit of the ice cap, ice-coring was operated at Site K2 (3, 901 m a.s.l.; ice thickness 240 m) from June 20 to 30, 1998. During 307 drilling runs in 103 hours, ice cores of 211.7 m in total length were recovered and the temperature of borehole-wall was measured down to 211.7 m. Temperatures at 10 m depth and the bottom of the borehole were -15.7°C and -4.2°C, respectively, showing a linear temperature increase with the depth. Ice cores were subjected to stratigraphic observation, bulk density measurements, electrical conductivity measurements (ECM) and imaging the whole length of ice cores with a digital video camera. In-situ ice core analyses of upper 141 m revealed that shallow cores above the pore close-off depth at about 55 m were composed of melt-frozen ice and dry firn, and of melt-frozen ice and compacted ice below that depth. There were 183 volcanic ash layers in the ice cores down to 141 m, and two ash layers were dated as specific erupted ashes by their facies. ECM signals were high at ice layers and reduced at volcanic ash layers. In addition to the glaciological work, the influence of high altitude on the physical conditions of members was studied.

収録刊行物

  • 雪氷

    雪氷 61 (1), 25-40, 1999

    公益社団法人 日本雪氷学会

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