Item type |
紀要論文(ELS) / Departmental Bulletin Paper(1) |
公開日 |
2002-03-01 |
タイトル |
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言語 |
en |
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タイトル |
Sticking deep ice core drills: Why, and how to recover |
言語 |
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言語 |
eng |
資源タイプ |
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資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
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資源タイプ |
departmental bulletin paper |
ページ属性 |
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内容記述タイプ |
Other |
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内容記述 |
P(論文) |
著者名(英) |
Gundestrup, Niels S.
Johnsen, Sigfus J.
Hansen, Steffen B.
Shoji, Hitoshi
Talalay, Pavel
Wilhelms, Frank
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著者所属(英) |
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en |
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University of Copenhagen, Department of Geophysics/University of Copenhagen, Department of Geophysics/University of Copenhagen, Department of Geophysics/Kitami Institute of Technology/Department of Descriptive Geometry, St. Petersburg State Mining Institute/AWI, Colombusstrasse |
抄録(英) |
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内容記述タイプ |
Other |
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内容記述 |
The GISP deep drill became stuck in 1981,but was free the following year. The NGRIP/EPICA deep drill has suffered from two big setbacks : The drill is stuck both at NGRIP in Greenland and at Dome C in Antarctica. Both events occurred in a period with routine drilling and high productivity. The reasons for the two events are believed to be different, but the chosen bore-hole liquid seems to be problematic. The densifier can adhere to the surface of the ice cuttings, making fine ice cuttings to sink in the liquid, in spite of a liquid density of 935kg/m^3. In spite of changed procedures and modified constructions, the drill became stuck again at NGRIP. It was freed using glycol, making use of both the temperature and temperature gradient in the hole. |
雑誌書誌ID |
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収録物識別子タイプ |
NCID |
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収録物識別子 |
AA00733561 |
書誌情報 |
Memoirs of National Institute of Polar Research. Special issue
巻 56,
p. 181-195,
発行日 2002-03
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