Performance of intermediate depth portable ice core drilling system on polar and temperate glaciers

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A portable ice core drilling system was developed at the Byrd Polar Research Center (BPRC) and tested during four field seasons on both polar and temperate ice fields. The prime features of the new drilling system include its low power requirement, light weight, depth capability of 500m, quick setup, easy ice core handling, and high ice core production rate (ICPR). Since 1997,more than 1200m of ice cores has been recovered with the BPRC dry hole electro-mechanical (EM) drill. After modifications described in this paper, the drill achieved the following performance characteristics : (1) drilling from the surface to 15m in one hour in cold firn; (2) drilling to 30m within 2.5 hours and (3) drilling to 100m within 14 hours, with an average ICPR of 7.15m/h. Six boreholes in the temperate ice on the summit of Mt. Kilimanjaro (5985m a. s. l.) totaling 200m were drilled to bedrock. The deepest hole was drilled down to 51m. High concentrations of dust and thick layers of volcanic ash were common features in the Mt. Kilimanjaro ice, where the average ICPR was 8-10m/h. A new version of the antifreeze-thermal-electric drill (ATED) has been developed and laboratory tested. The paper presents a comprehensive examination of the EM and ATED drill performances based on quantitative data regarding drill design and conditions at drilling sites. The optimal protocol for coring in polar and temperate ice at air temperatures above the melting point is examined.

収録刊行物

  • Memoirs of National Institute of Polar Research. Special issue

    Memoirs of National Institute of Polar Research. Special issue 56, 67-81, 2002-03

    国立極地研究所

被引用文献:  2件中 1-2件 を表示

各種コード

  • NII論文ID(NAID)
    110000010495
  • NII書誌ID(NCID)
    AA00733561
  • 本文言語コード
    ENG
  • 資料種別
    雑誌論文
  • ISSN
    03860744
  • データ提供元
    CJP引用  NII-ELS 
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