Sticking deep ice core drills: Why and how to recover
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概要
- 論文の詳細を見る
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.
- 国立極地研究所の論文
著者
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Shoji Hitoshi
Kitami Institute of Technology
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Johnsen Sigfus
University of Copenhagen
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Johnsen S
University Of Copenhagen Department Of Geophysics
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Gundestrup Niels
University of Copenhagen, Department of Geophysics
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Hansen Steffen
University of Copenhagen, Department of Geophysics
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Talalay Pavel
Department of Descriptive Geometry, St. Petersburg State Mining Institute
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Wilhelms Frank
AWI, Colombusstrasse
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Hansen Steffen
University Of Copenhagen Department Of Geophysics
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Gundestrup Niels
University Of Copenhagen Department Of Geophysics
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Talalay Pavel
Department Of Descriptive Geometry St. Petersburg State Mining Institute
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Wilhelms F
Awi Colombusstrasse
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Gundestrup Niels
University Of Copenhagen
関連論文
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- Preface
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