Effects of undercutting and sliding on calving: a global approach applied to Kronebreen, Svalbard
In this paper, we study the effects of basal friction, sub-aqueous undercutting and glacier geometry on the calving process by combining six different models in an offline-coupled workflow: a continuum–mechanical ice flow model (Elmer/Ice), a climatic mass balance model, a simple subglacial hydrolog...
Published in: | The Cryosphere |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Copernicus Publications
2018
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00007270 2023-05-15T16:22:10+02:00 Effects of undercutting and sliding on calving: a global approach applied to Kronebreen, Svalbard Vallot, Dorothée Åström, Jan Zwinger, Thomas Pettersson, Rickard Everett, Alistair Benn, Douglas I. Luckman, Adrian van Pelt, Ward J. J. Nick, Faezeh Kohler, Jack 2018-02 electronic https://doi.org/10.5194/tc-12-609-2018 https://noa.gwlb.de/receive/cop_mods_00007270 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00007227/tc-12-609-2018.pdf https://tc.copernicus.org/articles/12/609/2018/tc-12-609-2018.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-12-609-2018 https://noa.gwlb.de/receive/cop_mods_00007270 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00007227/tc-12-609-2018.pdf https://tc.copernicus.org/articles/12/609/2018/tc-12-609-2018.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2018 ftnonlinearchiv https://doi.org/10.5194/tc-12-609-2018 2022-02-08T22:58:37Z In this paper, we study the effects of basal friction, sub-aqueous undercutting and glacier geometry on the calving process by combining six different models in an offline-coupled workflow: a continuum–mechanical ice flow model (Elmer/Ice), a climatic mass balance model, a simple subglacial hydrology model, a plume model, an undercutting model and a discrete particle model to investigate fracture dynamics (Helsinki Discrete Element Model, HiDEM). We demonstrate the feasibility of reproducing the observed calving retreat at the front of Kronebreen, a tidewater glacier in Svalbard, during a melt season by using the output from the first five models as input to HiDEM. Basal sliding and glacier motion are addressed using Elmer/Ice, while calving is modelled by HiDEM. A hydrology model calculates subglacial drainage paths and indicates two main outlets with different discharges. Depending on the discharge, the plume model computes frontal melt rates, which are iteratively projected to the actual front of the glacier at subglacial discharge locations. This produces undercutting of different sizes, as melt is concentrated close to the surface for high discharge and is more diffuse for low discharge. By testing different configurations, we show that undercutting plays a key role in glacier retreat and is necessary to reproduce observed retreat in the vicinity of the discharge locations during the melting season. Calving rates are also influenced by basal friction, through its effects on near-terminus strain rates and ice velocity. Article in Journal/Newspaper glacier Svalbard The Cryosphere Tidewater Niedersächsisches Online-Archiv NOA Kronebreen ENVELOPE(13.333,13.333,78.833,78.833) Svalbard The Cryosphere 12 2 609 625 |
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Open Polar |
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Niedersächsisches Online-Archiv NOA |
op_collection_id |
ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Vallot, Dorothée Åström, Jan Zwinger, Thomas Pettersson, Rickard Everett, Alistair Benn, Douglas I. Luckman, Adrian van Pelt, Ward J. J. Nick, Faezeh Kohler, Jack Effects of undercutting and sliding on calving: a global approach applied to Kronebreen, Svalbard |
topic_facet |
article Verlagsveröffentlichung |
description |
In this paper, we study the effects of basal friction, sub-aqueous undercutting and glacier geometry on the calving process by combining six different models in an offline-coupled workflow: a continuum–mechanical ice flow model (Elmer/Ice), a climatic mass balance model, a simple subglacial hydrology model, a plume model, an undercutting model and a discrete particle model to investigate fracture dynamics (Helsinki Discrete Element Model, HiDEM). We demonstrate the feasibility of reproducing the observed calving retreat at the front of Kronebreen, a tidewater glacier in Svalbard, during a melt season by using the output from the first five models as input to HiDEM. Basal sliding and glacier motion are addressed using Elmer/Ice, while calving is modelled by HiDEM. A hydrology model calculates subglacial drainage paths and indicates two main outlets with different discharges. Depending on the discharge, the plume model computes frontal melt rates, which are iteratively projected to the actual front of the glacier at subglacial discharge locations. This produces undercutting of different sizes, as melt is concentrated close to the surface for high discharge and is more diffuse for low discharge. By testing different configurations, we show that undercutting plays a key role in glacier retreat and is necessary to reproduce observed retreat in the vicinity of the discharge locations during the melting season. Calving rates are also influenced by basal friction, through its effects on near-terminus strain rates and ice velocity. |
format |
Article in Journal/Newspaper |
author |
Vallot, Dorothée Åström, Jan Zwinger, Thomas Pettersson, Rickard Everett, Alistair Benn, Douglas I. Luckman, Adrian van Pelt, Ward J. J. Nick, Faezeh Kohler, Jack |
author_facet |
Vallot, Dorothée Åström, Jan Zwinger, Thomas Pettersson, Rickard Everett, Alistair Benn, Douglas I. Luckman, Adrian van Pelt, Ward J. J. Nick, Faezeh Kohler, Jack |
author_sort |
Vallot, Dorothée |
title |
Effects of undercutting and sliding on calving: a global approach applied to Kronebreen, Svalbard |
title_short |
Effects of undercutting and sliding on calving: a global approach applied to Kronebreen, Svalbard |
title_full |
Effects of undercutting and sliding on calving: a global approach applied to Kronebreen, Svalbard |
title_fullStr |
Effects of undercutting and sliding on calving: a global approach applied to Kronebreen, Svalbard |
title_full_unstemmed |
Effects of undercutting and sliding on calving: a global approach applied to Kronebreen, Svalbard |
title_sort |
effects of undercutting and sliding on calving: a global approach applied to kronebreen, svalbard |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/tc-12-609-2018 https://noa.gwlb.de/receive/cop_mods_00007270 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00007227/tc-12-609-2018.pdf https://tc.copernicus.org/articles/12/609/2018/tc-12-609-2018.pdf |
long_lat |
ENVELOPE(13.333,13.333,78.833,78.833) |
geographic |
Kronebreen Svalbard |
geographic_facet |
Kronebreen Svalbard |
genre |
glacier Svalbard The Cryosphere Tidewater |
genre_facet |
glacier Svalbard 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-12-609-2018 https://noa.gwlb.de/receive/cop_mods_00007270 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00007227/tc-12-609-2018.pdf https://tc.copernicus.org/articles/12/609/2018/tc-12-609-2018.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/tc-12-609-2018 |
container_title |
The Cryosphere |
container_volume |
12 |
container_issue |
2 |
container_start_page |
609 |
op_container_end_page |
625 |
_version_ |
1766010139669692416 |