Modelling the impact of submarine frontal melting and ice mélange on glacier dynamics
Submarine melting of the calving face of tidewater glaciers and the mechanical back force applied by the ice mélange layer are two mechanisms generally proposed to explain seasonal variations at the calving front of tidewater glaciers. However, the way these processes affect the calving rate and gla...
Published in: | The Cryosphere |
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Copernicus Publications
2015
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00016506 2023-05-15T18:32:33+02:00 Modelling the impact of submarine frontal melting and ice mélange on glacier dynamics Krug, J. Durand, G. Gagliardini, O. Weiss, J. 2015-05 electronic https://doi.org/10.5194/tc-9-989-2015 https://noa.gwlb.de/receive/cop_mods_00016506 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00016461/tc-9-989-2015.pdf https://tc.copernicus.org/articles/9/989/2015/tc-9-989-2015.pdf eng eng Copernicus Publications The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-9-989-2015 https://noa.gwlb.de/receive/cop_mods_00016506 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00016461/tc-9-989-2015.pdf https://tc.copernicus.org/articles/9/989/2015/tc-9-989-2015.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2015 ftnonlinearchiv https://doi.org/10.5194/tc-9-989-2015 2022-02-08T22:54:07Z Submarine melting of the calving face of tidewater glaciers and the mechanical back force applied by the ice mélange layer are two mechanisms generally proposed to explain seasonal variations at the calving front of tidewater glaciers. However, the way these processes affect the calving rate and glacier dynamics remains uncertain. In this study, we used a finite element-based model that solves the full Stokes equations to simulate the impact of these forcings on two-dimensional theoretical flow line glacier configurations. The model, which includes calving processes, suggests that frontal melting affects the position of the terminus only slightly (less than a few hundred metres) and does not affect the multiannual glacier mass balance at all. However, the ice mélange has a greater impact on the advance and retreat cycles of the glacier front (more than several kilometres) and its consequences for the mass balance are not completely negligible, stressing the need for better characterization of forcing properties. We also show that ice mélange forcing against the calving face can mechanically prevent crevasse propagation at sea level and hence prevent calving. Results also reveal different behaviours in grounded and floating glaciers: in the case of a floating extension, the strongest forcings can disrupt the glacier equilibrium by modifying its buttressing and ice flux at the grounding line. Article in Journal/Newspaper The Cryosphere Tidewater Niedersächsisches Online-Archiv NOA Line Glacier ENVELOPE(167.833,167.833,-72.983,-72.983) The Cryosphere 9 3 989 1003 |
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Open Polar |
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Niedersächsisches Online-Archiv NOA |
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ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Krug, J. Durand, G. Gagliardini, O. Weiss, J. Modelling the impact of submarine frontal melting and ice mélange on glacier dynamics |
topic_facet |
article Verlagsveröffentlichung |
description |
Submarine melting of the calving face of tidewater glaciers and the mechanical back force applied by the ice mélange layer are two mechanisms generally proposed to explain seasonal variations at the calving front of tidewater glaciers. However, the way these processes affect the calving rate and glacier dynamics remains uncertain. In this study, we used a finite element-based model that solves the full Stokes equations to simulate the impact of these forcings on two-dimensional theoretical flow line glacier configurations. The model, which includes calving processes, suggests that frontal melting affects the position of the terminus only slightly (less than a few hundred metres) and does not affect the multiannual glacier mass balance at all. However, the ice mélange has a greater impact on the advance and retreat cycles of the glacier front (more than several kilometres) and its consequences for the mass balance are not completely negligible, stressing the need for better characterization of forcing properties. We also show that ice mélange forcing against the calving face can mechanically prevent crevasse propagation at sea level and hence prevent calving. Results also reveal different behaviours in grounded and floating glaciers: in the case of a floating extension, the strongest forcings can disrupt the glacier equilibrium by modifying its buttressing and ice flux at the grounding line. |
format |
Article in Journal/Newspaper |
author |
Krug, J. Durand, G. Gagliardini, O. Weiss, J. |
author_facet |
Krug, J. Durand, G. Gagliardini, O. Weiss, J. |
author_sort |
Krug, J. |
title |
Modelling the impact of submarine frontal melting and ice mélange on glacier dynamics |
title_short |
Modelling the impact of submarine frontal melting and ice mélange on glacier dynamics |
title_full |
Modelling the impact of submarine frontal melting and ice mélange on glacier dynamics |
title_fullStr |
Modelling the impact of submarine frontal melting and ice mélange on glacier dynamics |
title_full_unstemmed |
Modelling the impact of submarine frontal melting and ice mélange on glacier dynamics |
title_sort |
modelling the impact of submarine frontal melting and ice mélange on glacier dynamics |
publisher |
Copernicus Publications |
publishDate |
2015 |
url |
https://doi.org/10.5194/tc-9-989-2015 https://noa.gwlb.de/receive/cop_mods_00016506 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00016461/tc-9-989-2015.pdf https://tc.copernicus.org/articles/9/989/2015/tc-9-989-2015.pdf |
long_lat |
ENVELOPE(167.833,167.833,-72.983,-72.983) |
geographic |
Line Glacier |
geographic_facet |
Line Glacier |
genre |
The Cryosphere Tidewater |
genre_facet |
The Cryosphere Tidewater |
op_relation |
The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-9-989-2015 https://noa.gwlb.de/receive/cop_mods_00016506 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00016461/tc-9-989-2015.pdf https://tc.copernicus.org/articles/9/989/2015/tc-9-989-2015.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/tc-9-989-2015 |
container_title |
The Cryosphere |
container_volume |
9 |
container_issue |
3 |
container_start_page |
989 |
op_container_end_page |
1003 |
_version_ |
1766216711592214528 |