Ice stream subglacial access for ice-sheet history and fast ice flow: the BEAMISH Project on Rutford Ice Stream, West Antarctica and initial results on basal conditions
Abstract Three holes were drilled to the bed of Rutford Ice Stream, through ice up to 2154 m thick, to investigate the basal processes and conditions associated with fast ice flow and the glacial history of the West Antarctic Ice Sheet. A narrative of the drilling, measuring and sampling activities,...
Published in: | Annals of Glaciology |
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Online Access: | http://dx.doi.org/10.1017/aog.2020.82 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0260305520000828 |
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crcambridgeupr:10.1017/aog.2020.82 2024-06-23T07:45:36+00:00 Ice stream subglacial access for ice-sheet history and fast ice flow: the BEAMISH Project on Rutford Ice Stream, West Antarctica and initial results on basal conditions Smith, A. M. Anker, P. G. D. Nicholls, K. W. Makinson, K. Murray, T. Rios-Costas, S. Brisbourne, A. M. Hodgson, D. A. Schlegel, R. Anandakrishnan, S. 2020 http://dx.doi.org/10.1017/aog.2020.82 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0260305520000828 en eng Cambridge University Press (CUP) http://creativecommons.org/licenses/by/4.0/ Annals of Glaciology volume 62, issue 85-86, page 203-211 ISSN 0260-3055 1727-5644 journal-article 2020 crcambridgeupr https://doi.org/10.1017/aog.2020.82 2024-06-05T04:04:36Z Abstract Three holes were drilled to the bed of Rutford Ice Stream, through ice up to 2154 m thick, to investigate the basal processes and conditions associated with fast ice flow and the glacial history of the West Antarctic Ice Sheet. A narrative of the drilling, measuring and sampling activities, as well as some preliminary results and initial interpretations of subglacial conditions, is given. These were the deepest subglacial access holes ever drilled using the hot-water drilling method. Samples of bed and englacial sediments were recovered, and a number of instruments were installed in the ice column and the bed. The ice–bed interface was found to be unfrozen, with an existing, well-developed subglacial hydrological system at high pressure, within ~1% of the ice overburden. The bed itself comprises soft, water-saturated sediments, consistent with previous geophysical interpretations. Englacial sediment quantity varies significantly between two locations ~2 km apart, and possibly over even shorter (~20 m) distances. Difficulties and unusual observations encountered while connecting to the subglacial hydrological system in one hole possibly resulted from the presence of a large clast embedded in the bottom of the ice. Article in Journal/Newspaper Annals of Glaciology Antarc* Antarctic Antarctica Ice Sheet Rutford Ice Stream West Antarctica Cambridge University Press Antarctic Rutford ENVELOPE(-85.300,-85.300,-78.600,-78.600) Rutford Ice Stream ENVELOPE(-80.000,-80.000,-79.167,-79.167) West Antarctic Ice Sheet West Antarctica Annals of Glaciology 1 9 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
description |
Abstract Three holes were drilled to the bed of Rutford Ice Stream, through ice up to 2154 m thick, to investigate the basal processes and conditions associated with fast ice flow and the glacial history of the West Antarctic Ice Sheet. A narrative of the drilling, measuring and sampling activities, as well as some preliminary results and initial interpretations of subglacial conditions, is given. These were the deepest subglacial access holes ever drilled using the hot-water drilling method. Samples of bed and englacial sediments were recovered, and a number of instruments were installed in the ice column and the bed. The ice–bed interface was found to be unfrozen, with an existing, well-developed subglacial hydrological system at high pressure, within ~1% of the ice overburden. The bed itself comprises soft, water-saturated sediments, consistent with previous geophysical interpretations. Englacial sediment quantity varies significantly between two locations ~2 km apart, and possibly over even shorter (~20 m) distances. Difficulties and unusual observations encountered while connecting to the subglacial hydrological system in one hole possibly resulted from the presence of a large clast embedded in the bottom of the ice. |
format |
Article in Journal/Newspaper |
author |
Smith, A. M. Anker, P. G. D. Nicholls, K. W. Makinson, K. Murray, T. Rios-Costas, S. Brisbourne, A. M. Hodgson, D. A. Schlegel, R. Anandakrishnan, S. |
spellingShingle |
Smith, A. M. Anker, P. G. D. Nicholls, K. W. Makinson, K. Murray, T. Rios-Costas, S. Brisbourne, A. M. Hodgson, D. A. Schlegel, R. Anandakrishnan, S. Ice stream subglacial access for ice-sheet history and fast ice flow: the BEAMISH Project on Rutford Ice Stream, West Antarctica and initial results on basal conditions |
author_facet |
Smith, A. M. Anker, P. G. D. Nicholls, K. W. Makinson, K. Murray, T. Rios-Costas, S. Brisbourne, A. M. Hodgson, D. A. Schlegel, R. Anandakrishnan, S. |
author_sort |
Smith, A. M. |
title |
Ice stream subglacial access for ice-sheet history and fast ice flow: the BEAMISH Project on Rutford Ice Stream, West Antarctica and initial results on basal conditions |
title_short |
Ice stream subglacial access for ice-sheet history and fast ice flow: the BEAMISH Project on Rutford Ice Stream, West Antarctica and initial results on basal conditions |
title_full |
Ice stream subglacial access for ice-sheet history and fast ice flow: the BEAMISH Project on Rutford Ice Stream, West Antarctica and initial results on basal conditions |
title_fullStr |
Ice stream subglacial access for ice-sheet history and fast ice flow: the BEAMISH Project on Rutford Ice Stream, West Antarctica and initial results on basal conditions |
title_full_unstemmed |
Ice stream subglacial access for ice-sheet history and fast ice flow: the BEAMISH Project on Rutford Ice Stream, West Antarctica and initial results on basal conditions |
title_sort |
ice stream subglacial access for ice-sheet history and fast ice flow: the beamish project on rutford ice stream, west antarctica and initial results on basal conditions |
publisher |
Cambridge University Press (CUP) |
publishDate |
2020 |
url |
http://dx.doi.org/10.1017/aog.2020.82 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0260305520000828 |
long_lat |
ENVELOPE(-85.300,-85.300,-78.600,-78.600) ENVELOPE(-80.000,-80.000,-79.167,-79.167) |
geographic |
Antarctic Rutford Rutford Ice Stream West Antarctic Ice Sheet West Antarctica |
geographic_facet |
Antarctic Rutford Rutford Ice Stream West Antarctic Ice Sheet West Antarctica |
genre |
Annals of Glaciology Antarc* Antarctic Antarctica Ice Sheet Rutford Ice Stream West Antarctica |
genre_facet |
Annals of Glaciology Antarc* Antarctic Antarctica Ice Sheet Rutford Ice Stream West Antarctica |
op_source |
Annals of Glaciology volume 62, issue 85-86, page 203-211 ISSN 0260-3055 1727-5644 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1017/aog.2020.82 |
container_title |
Annals of Glaciology |
container_start_page |
1 |
op_container_end_page |
9 |
_version_ |
1802641465528025088 |