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Rapidly changing subglacial hydrological pathways at a tidewater glacier revealed through simultaneous observations of water pressure, supraglacial lakes, meltwater plumes and surface velocities

Penelope How Orcid Logo, Douglas I. Benn, Nicholas R. J. Hulton, Bryn Hubbard Orcid Logo, Adrian Luckman Orcid Logo, Heïdi Sevestre, Ward J. J. van Pelt Orcid Logo, Katrin Lindbäck Orcid Logo, Jack Kohler, Wim Boot

The Cryosphere, Volume: 11, Issue: 6, Pages: 2691 - 2710

Swansea University Author: Adrian Luckman Orcid Logo

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DOI (Published version): 10.5194/tc-11-2691-2017

Abstract

Subglacial hydrological processes at tidewater glaciers remain poorly understood due to the difficulty in obtaining direct measurements and lack of empirical verification for modelling approaches. Here, we investigate the subglacial hydrology of Kronebreen, a fast-flowing tidewater glacier in Svalba...

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Published in: The Cryosphere
ISSN: 1994-0424
Published: Copernicus GmbH 2017
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URI: https://cronfa.swan.ac.uk/Record/cronfa66113
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spelling v2 66113 2024-04-22 Rapidly changing subglacial hydrological pathways at a tidewater glacier revealed through simultaneous observations of water pressure, supraglacial lakes, meltwater plumes and surface velocities 008cb668b2671b653a88677f075799a9 0000-0002-9618-5905 Adrian Luckman Adrian Luckman true false 2024-04-22 BGPS Subglacial hydrological processes at tidewater glaciers remain poorly understood due to the difficulty in obtaining direct measurements and lack of empirical verification for modelling approaches. Here, we investigate the subglacial hydrology of Kronebreen, a fast-flowing tidewater glacier in Svalbard during the 2014 melt season. We combine observations of borehole water pressure, supraglacial lake drainage, surface velocities and plume activity with modelled run-off and water routing to develop a conceptual model that thoroughly encapsulates subglacial drainage at a tidewater glacier. Simultaneous measurements suggest that an early-season episode of subglacial flushing took place during our observation period, and a stable efficient drainage system effectively transported subglacial water through the northern region of the glacier tongue. Drainage pathways through the central and southern regions of the glacier tongue were disrupted throughout the following melt season. Periodic plume activity at the terminus appears to be a signal for modulated subglacial pulsing, i.e. an internally driven storage and release of subglacial meltwater that operates independently of marine influences. This storage is a key control on ice flow in the 2014 melt season. Evidence from this work and previous studies strongly suggests that long-term changes in ice flow at Kronebreen are controlled by the location of efficient/inefficient drainage and the position of regions where water is stored and released. Journal Article The Cryosphere 11 6 2691 2710 Copernicus GmbH 1994-0424 21 11 2017 2017-11-21 10.5194/tc-11-2691-2017 COLLEGE NANME Biosciences Geography and Physics School COLLEGE CODE BGPS Swansea University This work was funded by the Conoco Phillips-Lundin Northern Area Program through the CRIOS project (Calving Rates and Impact On Sea level, http://www.researchinsvalbard.no/project/7037). Penelope How is supported by a NERC PhD studentship. TerraSAR-X data were provided by DLR (project OCE1503). This work would not have been possible without the logistical support provided by Airlift AS, the Norwegian Polar Institute Sverdrup Research Station in Ny Ålesund, and the University Centre in Svalbard (UNIS) Tech and Logistics team. We greatly acknowledge Alex Hart and the GeoSciences Mechanical Workshop at the University of Edinburgh for manufacturing the time-lapse camera enclosures that were used in this study. Bryn Hubbard acknowledges capital equipment support from HEFCW/Aberystwyth University. We would also like to thank Silje Smith-Johnsen for her assistance in the deployment of the time-lapse cameras, Fiona Clubb for her guidance on data visualisation, Donald Slater for useful comments and feedback on this paper, Andreas Vieli as the nominated editor of this paper, and the three appointed reviewers who consisted of Shin Sugiyama and two anonymous reviewers. 2024-05-30T13:52:43.7123167 2024-04-22T09:26:57.1330233 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Geography Penelope How 0000-0002-8088-8497 1 Douglas I. Benn 2 Nicholas R. J. Hulton 3 Bryn Hubbard 0000-0002-3565-3875 4 Adrian Luckman 0000-0002-9618-5905 5 Heïdi Sevestre 6 Ward J. J. van Pelt 0000-0003-4839-7900 7 Katrin Lindb&amp;auml;ck 0000-0002-5941-6743 8 Jack Kohler 9 Wim Boot 10 66113__30492__b9c4e6c561224ae2845b02fc14cd5044.pdf 66113.VoR.pdf 2024-05-30T13:51:52.1824598 Output 10248281 application/pdf Version of Record true © Author(s) 2017. This work is distributed under the Creative Commons Attribution 3.0 License. true eng https://creativecommons.org/licenses/by/3.0/
title Rapidly changing subglacial hydrological pathways at a tidewater glacier revealed through simultaneous observations of water pressure, supraglacial lakes, meltwater plumes and surface velocities
spellingShingle Rapidly changing subglacial hydrological pathways at a tidewater glacier revealed through simultaneous observations of water pressure, supraglacial lakes, meltwater plumes and surface velocities
Adrian Luckman
title_short Rapidly changing subglacial hydrological pathways at a tidewater glacier revealed through simultaneous observations of water pressure, supraglacial lakes, meltwater plumes and surface velocities
title_full Rapidly changing subglacial hydrological pathways at a tidewater glacier revealed through simultaneous observations of water pressure, supraglacial lakes, meltwater plumes and surface velocities
title_fullStr Rapidly changing subglacial hydrological pathways at a tidewater glacier revealed through simultaneous observations of water pressure, supraglacial lakes, meltwater plumes and surface velocities
title_full_unstemmed Rapidly changing subglacial hydrological pathways at a tidewater glacier revealed through simultaneous observations of water pressure, supraglacial lakes, meltwater plumes and surface velocities
title_sort Rapidly changing subglacial hydrological pathways at a tidewater glacier revealed through simultaneous observations of water pressure, supraglacial lakes, meltwater plumes and surface velocities
author_id_str_mv 008cb668b2671b653a88677f075799a9
author_id_fullname_str_mv 008cb668b2671b653a88677f075799a9_***_Adrian Luckman
author Adrian Luckman
author2 Penelope How
Douglas I. Benn
Nicholas R. J. Hulton
Bryn Hubbard
Adrian Luckman
Heïdi Sevestre
Ward J. J. van Pelt
Katrin Lindb&amp;auml;ck
Jack Kohler
Wim Boot
format Journal article
container_title The Cryosphere
container_volume 11
container_issue 6
container_start_page 2691
publishDate 2017
institution Swansea University
issn 1994-0424
doi_str_mv 10.5194/tc-11-2691-2017
publisher Copernicus GmbH
college_str Faculty of Science and Engineering
hierarchytype
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
active_str 0
description Subglacial hydrological processes at tidewater glaciers remain poorly understood due to the difficulty in obtaining direct measurements and lack of empirical verification for modelling approaches. Here, we investigate the subglacial hydrology of Kronebreen, a fast-flowing tidewater glacier in Svalbard during the 2014 melt season. We combine observations of borehole water pressure, supraglacial lake drainage, surface velocities and plume activity with modelled run-off and water routing to develop a conceptual model that thoroughly encapsulates subglacial drainage at a tidewater glacier. Simultaneous measurements suggest that an early-season episode of subglacial flushing took place during our observation period, and a stable efficient drainage system effectively transported subglacial water through the northern region of the glacier tongue. Drainage pathways through the central and southern regions of the glacier tongue were disrupted throughout the following melt season. Periodic plume activity at the terminus appears to be a signal for modulated subglacial pulsing, i.e. an internally driven storage and release of subglacial meltwater that operates independently of marine influences. This storage is a key control on ice flow in the 2014 melt season. Evidence from this work and previous studies strongly suggests that long-term changes in ice flow at Kronebreen are controlled by the location of efficient/inefficient drainage and the position of regions where water is stored and released.
published_date 2017-11-21T13:52:43Z
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score 11.017797

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