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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

A. M. Smith, P. G. D. Anker, K. W. Nicholls, K. Makinson, Tavi Murray Orcid Logo, S. Rios-Costas, A. M. Brisbourne, D. A. Hodgson, Rebecca Schlegel, S. Anandakrishnan

Annals of Glaciology, Volume: 62, Issue: 85-86, Pages: 203 - 211

Swansea University Authors: Tavi Murray Orcid Logo, Rebecca Schlegel

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DOI (Published version): 10.1017/aog.2020.82

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...

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Published in: Annals of Glaciology
ISSN: 0260-3055 1727-5644
Published: Cambridge University Press (CUP) 2021
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URI: https://cronfa.swan.ac.uk/Record/cronfa56382
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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. 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spelling v2 56382 2021-03-08 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 8d6e71df690e725cd44191006dac31da 0000-0001-6714-6512 Tavi Murray Tavi Murray true false 413f0697ac45c41cbb8f45aa60e4ff71 Rebecca Schlegel Rebecca Schlegel true false 2021-03-08 BGPS 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. Journal Article Annals of Glaciology 62 85-86 203 211 Cambridge University Press (CUP) 0260-3055 1727-5644 Antarctic glaciology; ice dynamics; ice streams; subglacial processes; subglacial sediments 1 9 2021 2021-09-01 10.1017/aog.2020.82 COLLEGE NANME Biosciences Geography and Physics School COLLEGE CODE BGPS Swansea University Another institution paid the OA fee This study was funded by the NERC AFI award Nos. NE/G014159/1 and NE/G013187/1. 2024-10-08T10:33:45.9186581 2021-03-08T14:54:40.3599303 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Geography A. M. Smith 1 P. G. D. Anker 2 K. W. Nicholls 3 K. Makinson 4 Tavi Murray 0000-0001-6714-6512 5 S. Rios-Costas 6 A. M. Brisbourne 7 D. A. Hodgson 8 Rebecca Schlegel 9 S. Anandakrishnan 10 56382__19445__481f2cf31c434e838063e269f86a13c3.pdf 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.pdf 2021-03-08T14:57:57.7950999 Output 639010 application/pdf Version of Record true © The Author(s), 2020. This is an Open Access article, distributed under the terms of the Creative Commons Attribution license true eng http://creativecommons.org/licenses/by/4.0/
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
spellingShingle 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
Tavi Murray
Rebecca Schlegel
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
author_id_str_mv 8d6e71df690e725cd44191006dac31da
413f0697ac45c41cbb8f45aa60e4ff71
author_id_fullname_str_mv 8d6e71df690e725cd44191006dac31da_***_Tavi Murray
413f0697ac45c41cbb8f45aa60e4ff71_***_Rebecca Schlegel
author Tavi Murray
Rebecca Schlegel
author2 A. M. Smith
P. G. D. Anker
K. W. Nicholls
K. Makinson
Tavi Murray
S. Rios-Costas
A. M. Brisbourne
D. A. Hodgson
Rebecca Schlegel
S. Anandakrishnan
format Journal article
container_title Annals of Glaciology
container_volume 62
container_issue 85-86
container_start_page 203
publishDate 2021
institution Swansea University
issn 0260-3055
1727-5644
doi_str_mv 10.1017/aog.2020.82
publisher Cambridge University Press (CUP)
college_str Faculty of Science and Engineering
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hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Geography{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Geography
document_store_str 1
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description 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.
published_date 2021-09-01T10:33:44Z
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score 11.035634

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