Sticking deep ice core drills: Why and how to recover

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 occured in a period with routine drilling and high productivity. The two re...

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Bibliographic Details
Main Authors: Gundestrup, N. S., Johnsen, S. J., Hansen, S. B., Shoji, H., Talalay, P., Wilhelms, Frank
Format: Article in Journal/Newspaper
Language:unknown
Published: 2002
Subjects:
Freed
Greenland
Antarc*
Antarctica
EPICA
GISP
ice core
NGRIP
Online Access:https://epic.awi.de/id/eprint/5703/
https://hdl.handle.net/10013/epic.16266
id ftawi:oai:epic.awi.de:5703
record_format openpolar
spelling ftawi:oai:epic.awi.de:5703 2023-09-05T13:13:31+02:00 Sticking deep ice core drills: Why and how to recover Gundestrup, N. S. Johnsen, S. J. Hansen, S. B. Shoji, H. Talalay, P. Wilhelms, Frank 2002 https://epic.awi.de/id/eprint/5703/ https://hdl.handle.net/10013/epic.16266 unknown Gundestrup, N. S. , Johnsen, S. J. , Hansen, S. B. , Shoji, H. , Talalay, P. and Wilhelms, F. orcid:0000-0001-7688-3135 (2002) Sticking deep ice core drills: Why and how to recover , Ice drilling technology 2000 : proceedings of the fifth International Workshop on Ice Drilling Technology, 30 October-1 November 2000, Nagaoka University of Technology, Nagaoka / Ed. by Nobuhiko Azuma and Yoshiyuki Fujii. (Memoirs of National Institute of, pp. 181-195 . hdl:10013/epic.16266 EPIC3Ice drilling technology 2000 : proceedings of the fifth International Workshop on Ice Drilling Technology, 30 October-1 November 2000, Nagaoka University of Technology, Nagaoka / Ed. by Nobuhiko Azuma and Yoshiyuki Fujii. (Memoirs of National Institute of, pp. 181-195, ISSN: 0386-0744 Article peerRev 2002 ftawi 2023-08-22T19:45:37Z 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 occured in a period with routine drilling and high productivity. The two 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 cuttings to sink in the liquid, in spite of a liquid density of 935 kg/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 temparature gradient in the hole. Article in Journal/Newspaper Antarc* Antarctica EPICA GISP Greenland ice core NGRIP Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Freed ENVELOPE(164.333,164.333,-71.483,-71.483) Greenland
institution Open Polar
collection Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
op_collection_id ftawi
language unknown
description 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 occured in a period with routine drilling and high productivity. The two 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 cuttings to sink in the liquid, in spite of a liquid density of 935 kg/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 temparature gradient in the hole.
format Article in Journal/Newspaper
author Gundestrup, N. S.
Johnsen, S. J.
Hansen, S. B.
Shoji, H.
Talalay, P.
Wilhelms, Frank
spellingShingle Gundestrup, N. S.
Johnsen, S. J.
Hansen, S. B.
Shoji, H.
Talalay, P.
Wilhelms, Frank
Sticking deep ice core drills: Why and how to recover
author_facet Gundestrup, N. S.
Johnsen, S. J.
Hansen, S. B.
Shoji, H.
Talalay, P.
Wilhelms, Frank
author_sort Gundestrup, N. S.
title Sticking deep ice core drills: Why and how to recover
title_short Sticking deep ice core drills: Why and how to recover
title_full Sticking deep ice core drills: Why and how to recover
title_fullStr Sticking deep ice core drills: Why and how to recover
title_full_unstemmed Sticking deep ice core drills: Why and how to recover
title_sort sticking deep ice core drills: why and how to recover
publishDate 2002
url https://epic.awi.de/id/eprint/5703/
https://hdl.handle.net/10013/epic.16266
long_lat ENVELOPE(164.333,164.333,-71.483,-71.483)
geographic Freed
Greenland
geographic_facet Freed
Greenland
genre Antarc*
Antarctica
EPICA
GISP
Greenland
ice core
NGRIP
genre_facet Antarc*
Antarctica
EPICA
GISP
Greenland
ice core
NGRIP
op_source EPIC3Ice drilling technology 2000 : proceedings of the fifth International Workshop on Ice Drilling Technology, 30 October-1 November 2000, Nagaoka University of Technology, Nagaoka / Ed. by Nobuhiko Azuma and Yoshiyuki Fujii. (Memoirs of National Institute of, pp. 181-195, ISSN: 0386-0744
op_relation Gundestrup, N. S. , Johnsen, S. J. , Hansen, S. B. , Shoji, H. , Talalay, P. and Wilhelms, F. orcid:0000-0001-7688-3135 (2002) Sticking deep ice core drills: Why and how to recover , Ice drilling technology 2000 : proceedings of the fifth International Workshop on Ice Drilling Technology, 30 October-1 November 2000, Nagaoka University of Technology, Nagaoka / Ed. by Nobuhiko Azuma and Yoshiyuki Fujii. (Memoirs of National Institute of, pp. 181-195 . hdl:10013/epic.16266
_version_ 1776204762656538624

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