A technique for continuous detection of drill liquid in ice cores
When drilling ice cores deeper than ∼100 m, drill liquid is required to maintain ice-core quality and to limit borehole closure. Due to high-pressure air bubbles in the ice, the ice core can crack during drilling and core retrieval, typically at 600–1200 m depth in Greenland. Ice from this 'bri...
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International Glaciological Society
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ftunivbern:oai:boris.unibe.ch:49707 2023-08-20T04:06:52+02:00 A technique for continuous detection of drill liquid in ice cores Warming, E. Svensson, A. Vallelonga, P. Bigler, Matthias 2013 application/pdf https://boris.unibe.ch/49707/1/a-technique-for-continuous-detection-of-drill-liquid-in-ice-cores.pdf https://boris.unibe.ch/49707/ eng eng International Glaciological Society https://boris.unibe.ch/49707/ info:eu-repo/semantics/restrictedAccess Warming, E.; Svensson, A.; Vallelonga, P.; Bigler, Matthias (2013). A technique for continuous detection of drill liquid in ice cores. Journal of glaciology, 59(215), pp. 503-506. International Glaciological Society 10.3189/2013JoG12J124 <http://dx.doi.org/10.3189/2013JoG12J124> 530 Physics info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion PeerReviewed 2013 ftunivbern https://doi.org/10.3189/2013JoG12J124 2023-07-31T21:07:16Z When drilling ice cores deeper than ∼100 m, drill liquid is required to maintain ice-core quality and to limit borehole closure. Due to high-pressure air bubbles in the ice, the ice core can crack during drilling and core retrieval, typically at 600–1200 m depth in Greenland. Ice from this 'brittle zone' can be contaminated by drill liquid as it seeps through cracks into the core. Continuous flow analysis (CFA) systems are routinely used to analyse ice for chemical impurities, so the detection of drill liquid is important for validating accurate measurements and avoiding potential instrument damage. An optical detector was constructed to identify drill liquid in CFA tubing by ultraviolet absorption spectroscopy at a wavelength of 290 nm. The set-up was successfully field-tested in the frame of the NEEM ice-core drilling project in Greenland. A total of 27 cases of drill liquid contamination were identified during the analysis of 175 m of brittle zone ice. The analyses most strongly affected by drill liquid contamination include insoluble dust particles, electrolytic conductivity, ammonium, hydrogen peroxide and sulphate. This method may also be applied to other types of drill liquid used at other drill sites. Article in Journal/Newspaper Greenland ice core Journal of Glaciology BORIS (Bern Open Repository and Information System, University of Bern) Greenland Journal of Glaciology 59 215 503 506 |
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Open Polar |
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BORIS (Bern Open Repository and Information System, University of Bern) |
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ftunivbern |
language |
English |
topic |
530 Physics |
spellingShingle |
530 Physics Warming, E. Svensson, A. Vallelonga, P. Bigler, Matthias A technique for continuous detection of drill liquid in ice cores |
topic_facet |
530 Physics |
description |
When drilling ice cores deeper than ∼100 m, drill liquid is required to maintain ice-core quality and to limit borehole closure. Due to high-pressure air bubbles in the ice, the ice core can crack during drilling and core retrieval, typically at 600–1200 m depth in Greenland. Ice from this 'brittle zone' can be contaminated by drill liquid as it seeps through cracks into the core. Continuous flow analysis (CFA) systems are routinely used to analyse ice for chemical impurities, so the detection of drill liquid is important for validating accurate measurements and avoiding potential instrument damage. An optical detector was constructed to identify drill liquid in CFA tubing by ultraviolet absorption spectroscopy at a wavelength of 290 nm. The set-up was successfully field-tested in the frame of the NEEM ice-core drilling project in Greenland. A total of 27 cases of drill liquid contamination were identified during the analysis of 175 m of brittle zone ice. The analyses most strongly affected by drill liquid contamination include insoluble dust particles, electrolytic conductivity, ammonium, hydrogen peroxide and sulphate. This method may also be applied to other types of drill liquid used at other drill sites. |
format |
Article in Journal/Newspaper |
author |
Warming, E. Svensson, A. Vallelonga, P. Bigler, Matthias |
author_facet |
Warming, E. Svensson, A. Vallelonga, P. Bigler, Matthias |
author_sort |
Warming, E. |
title |
A technique for continuous detection of drill liquid in ice cores |
title_short |
A technique for continuous detection of drill liquid in ice cores |
title_full |
A technique for continuous detection of drill liquid in ice cores |
title_fullStr |
A technique for continuous detection of drill liquid in ice cores |
title_full_unstemmed |
A technique for continuous detection of drill liquid in ice cores |
title_sort |
technique for continuous detection of drill liquid in ice cores |
publisher |
International Glaciological Society |
publishDate |
2013 |
url |
https://boris.unibe.ch/49707/1/a-technique-for-continuous-detection-of-drill-liquid-in-ice-cores.pdf https://boris.unibe.ch/49707/ |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland ice core Journal of Glaciology |
genre_facet |
Greenland ice core Journal of Glaciology |
op_source |
Warming, E.; Svensson, A.; Vallelonga, P.; Bigler, Matthias (2013). A technique for continuous detection of drill liquid in ice cores. Journal of glaciology, 59(215), pp. 503-506. International Glaciological Society 10.3189/2013JoG12J124 <http://dx.doi.org/10.3189/2013JoG12J124> |
op_relation |
https://boris.unibe.ch/49707/ |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.3189/2013JoG12J124 |
container_title |
Journal of Glaciology |
container_volume |
59 |
container_issue |
215 |
container_start_page |
503 |
op_container_end_page |
506 |
_version_ |
1774718231892721664 |