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Modelling environmental influences on calving at Helheim Glacier in eastern Greenland

S. Cook, I. C. Rutt, Tavi Murray Orcid Logo, Adrian Luckman Orcid Logo, T. Zwinger Orcid Logo, Nick Selmes Orcid Logo, A. Goldsack, T. D. James

The Cryosphere, Volume: 8, Issue: 3, Pages: 827 - 841

Swansea University Authors: Tavi Murray Orcid Logo, Adrian Luckman Orcid Logo, Nick Selmes Orcid Logo

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DOI (Published version): 10.5194/tc-8-827-2014

Abstract

Calving is an important mass-loss process for many glaciers worldwide, and has been assumed to respond to a variety of environmental influences. We present a grounded, flowline tidewater glacier model using a physically-based calving mechanism, applied to Helheim Glacier, eastern Greenland. By quali...

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Published in: The Cryosphere
ISSN: 1994-0424
Published: Copernicus GmbH 2014
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URI: https://cronfa.swan.ac.uk/Record/cronfa62749
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spelling 2023-03-09T14:12:32.9643580 v2 62749 2023-02-24 Modelling environmental influences on calving at Helheim Glacier in eastern Greenland 8d6e71df690e725cd44191006dac31da 0000-0001-6714-6512 Tavi Murray Tavi Murray true false 008cb668b2671b653a88677f075799a9 0000-0002-9618-5905 Adrian Luckman Adrian Luckman true false 90050dc47e1d8e9e9d12f7d3f0dc459f 0000-0002-6557-1379 Nick Selmes Nick Selmes true false 2023-02-24 SGE Calving is an important mass-loss process for many glaciers worldwide, and has been assumed to respond to a variety of environmental influences. We present a grounded, flowline tidewater glacier model using a physically-based calving mechanism, applied to Helheim Glacier, eastern Greenland. By qualitatively examining both modelled size and frequency of calving events, and the subsequent dynamic response, the model is found to realistically reproduce key aspects of observed calving behaviour. Experiments explore four environmental variables which have been suggested to affect calving rates: water depth in crevasses, basal water pressure, undercutting of the calving face by submarine melt and backstress from ice mélange. Of the four variables, only crevasse water depth and basal water pressure were found to have a significant effect on terminus behaviour when applied at a realistic magnitude. These results are in contrast to previous modelling studies, which have suggested that ocean temperatures could strongly influence the calving front. The results raise the possibility that Greenland outlet glaciers could respond to the recent trend of increased surface melt observed in Greenland more strongly than previously thought, as surface ablation can strongly affect water depth in crevasses and water pressure at the glacier bed. Journal Article The Cryosphere 8 3 827 841 Copernicus GmbH 1994-0424 6 5 2014 2014-05-06 10.5194/tc-8-827-2014 COLLEGE NANME Geography COLLEGE CODE SGE Swansea University 2023-03-09T14:12:32.9643580 2023-02-24T13:22:51.4757204 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Geography S. Cook 1 I. C. Rutt 2 Tavi Murray 0000-0001-6714-6512 3 Adrian Luckman 0000-0002-9618-5905 4 T. Zwinger 0000-0003-3360-4401 5 Nick Selmes 0000-0002-6557-1379 6 A. Goldsack 7 T. D. James 8
title Modelling environmental influences on calving at Helheim Glacier in eastern Greenland
spellingShingle Modelling environmental influences on calving at Helheim Glacier in eastern Greenland
Tavi Murray
Adrian Luckman
Nick Selmes
title_short Modelling environmental influences on calving at Helheim Glacier in eastern Greenland
title_full Modelling environmental influences on calving at Helheim Glacier in eastern Greenland
title_fullStr Modelling environmental influences on calving at Helheim Glacier in eastern Greenland
title_full_unstemmed Modelling environmental influences on calving at Helheim Glacier in eastern Greenland
title_sort Modelling environmental influences on calving at Helheim Glacier in eastern Greenland
author_id_str_mv 8d6e71df690e725cd44191006dac31da
008cb668b2671b653a88677f075799a9
90050dc47e1d8e9e9d12f7d3f0dc459f
author_id_fullname_str_mv 8d6e71df690e725cd44191006dac31da_***_Tavi Murray
008cb668b2671b653a88677f075799a9_***_Adrian Luckman
90050dc47e1d8e9e9d12f7d3f0dc459f_***_Nick Selmes
author Tavi Murray
Adrian Luckman
Nick Selmes
author2 S. Cook
I. C. Rutt
Tavi Murray
Adrian Luckman
T. Zwinger
Nick Selmes
A. Goldsack
T. D. James
format Journal article
container_title The Cryosphere
container_volume 8
container_issue 3
container_start_page 827
publishDate 2014
institution Swansea University
issn 1994-0424
doi_str_mv 10.5194/tc-8-827-2014
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 0
active_str 0
description Calving is an important mass-loss process for many glaciers worldwide, and has been assumed to respond to a variety of environmental influences. We present a grounded, flowline tidewater glacier model using a physically-based calving mechanism, applied to Helheim Glacier, eastern Greenland. By qualitatively examining both modelled size and frequency of calving events, and the subsequent dynamic response, the model is found to realistically reproduce key aspects of observed calving behaviour. Experiments explore four environmental variables which have been suggested to affect calving rates: water depth in crevasses, basal water pressure, undercutting of the calving face by submarine melt and backstress from ice mélange. Of the four variables, only crevasse water depth and basal water pressure were found to have a significant effect on terminus behaviour when applied at a realistic magnitude. These results are in contrast to previous modelling studies, which have suggested that ocean temperatures could strongly influence the calving front. The results raise the possibility that Greenland outlet glaciers could respond to the recent trend of increased surface melt observed in Greenland more strongly than previously thought, as surface ablation can strongly affect water depth in crevasses and water pressure at the glacier bed.
published_date 2014-05-06T04:23:05Z
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score 11.012678

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