Effects of undercutting and sliding on calving : a global approach applied to Kronebreen, Svalbard
Thomas Zwinger was supported by the Nordic Center of Excellence eSTICC (eScience Tools for Investigating Climate Change in Northern High Latitudes) funded by Nordforsk (grant 57001). Acquisition of the TerraSAR-X imagery was funded by the ConocoPhillips Northern Area Program, via the CRIOS project (...
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ftstandrewserep:oai:research-repository.st-andrews.ac.uk:10023/12768 2023-07-02T03:31:34+02:00 Effects of undercutting and sliding on calving : a global approach applied to Kronebreen, Svalbard Vallot, D. Åström, J. Zwinger, T. Pettersson, R. Everett, A. Benn, Douglas I. Luckman, A. van Pelt, W. J. J. Nick, F. Kohler, J. University of St Andrews. School of Geography & Sustainable Development University of St Andrews. Bell-Edwards Geographic Data Institute 2018-02-21T11:30:07Z 17 application/pdf http://hdl.handle.net/10023/12768 https://doi.org/10.5194/tc-12-609-2018 eng eng The Cryosphere Vallot , D , Åström , J , Zwinger , T , Pettersson , R , Everett , A , Benn , D I , Luckman , A , van Pelt , W J J , Nick , F & Kohler , J 2018 , ' Effects of undercutting and sliding on calving : a global approach applied to Kronebreen, Svalbard ' , The Cryosphere , vol. 12 , no. 2 , pp. 609-625 . https://doi.org/10.5194/tc-12-609-2018 1994-0416 PURE: 252359351 PURE UUID: dc50bede-cf7b-4566-8536-5d87aec3876a Bibtex: urn:59992076fd0eceff5d113a59e5150a81 Scopus: 85042457214 WOS: 000425729800002 ORCID: /0000-0002-3604-0886/work/64697369 http://hdl.handle.net/10023/12768 https://doi.org/10.5194/tc-12-609-2018 © Author(s) 2018. Open Access article. This work is distributed under the Creative Commons Attribution 4.0 License. GE Environmental Sciences QE Geology NDAS GE QE Journal article 2018 ftstandrewserep https://doi.org/10.5194/tc-12-609-2018 2023-06-13T18:28:13Z Thomas Zwinger was supported by the Nordic Center of Excellence eSTICC (eScience Tools for Investigating Climate Change in Northern High Latitudes) funded by Nordforsk (grant 57001). Acquisition of the TerraSAR-X imagery was funded by the ConocoPhillips Northern Area Program, via the CRIOS project (Calving Rates and Impact on Sea Level). The lead author received an Arctic Field Grant from the Svalbard Science Forum to acquire radar lines for the basal topography in 2014. 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. Publisher PDF ... Article in Journal/Newspaper Arctic Climate change glacier Svalbard The Cryosphere Tidewater University of St Andrews: Digital Research Repository Arctic Kronebreen ENVELOPE(13.333,13.333,78.833,78.833) Svalbard The Cryosphere 12 2 609 625 |
institution |
Open Polar |
collection |
University of St Andrews: Digital Research Repository |
op_collection_id |
ftstandrewserep |
language |
English |
topic |
GE Environmental Sciences QE Geology NDAS GE QE |
spellingShingle |
GE Environmental Sciences QE Geology NDAS GE QE Vallot, D. Åström, J. Zwinger, T. Pettersson, R. Everett, A. Benn, Douglas I. Luckman, A. van Pelt, W. J. J. Nick, F. Kohler, J. Effects of undercutting and sliding on calving : a global approach applied to Kronebreen, Svalbard |
topic_facet |
GE Environmental Sciences QE Geology NDAS GE QE |
description |
Thomas Zwinger was supported by the Nordic Center of Excellence eSTICC (eScience Tools for Investigating Climate Change in Northern High Latitudes) funded by Nordforsk (grant 57001). Acquisition of the TerraSAR-X imagery was funded by the ConocoPhillips Northern Area Program, via the CRIOS project (Calving Rates and Impact on Sea Level). The lead author received an Arctic Field Grant from the Svalbard Science Forum to acquire radar lines for the basal topography in 2014. 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. Publisher PDF ... |
author2 |
University of St Andrews. School of Geography & Sustainable Development University of St Andrews. Bell-Edwards Geographic Data Institute |
format |
Article in Journal/Newspaper |
author |
Vallot, D. Åström, J. Zwinger, T. Pettersson, R. Everett, A. Benn, Douglas I. Luckman, A. van Pelt, W. J. J. Nick, F. Kohler, J. |
author_facet |
Vallot, D. Åström, J. Zwinger, T. Pettersson, R. Everett, A. Benn, Douglas I. Luckman, A. van Pelt, W. J. J. Nick, F. Kohler, J. |
author_sort |
Vallot, D. |
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 |
publishDate |
2018 |
url |
http://hdl.handle.net/10023/12768 https://doi.org/10.5194/tc-12-609-2018 |
long_lat |
ENVELOPE(13.333,13.333,78.833,78.833) |
geographic |
Arctic Kronebreen Svalbard |
geographic_facet |
Arctic Kronebreen Svalbard |
genre |
Arctic Climate change glacier Svalbard The Cryosphere Tidewater |
genre_facet |
Arctic Climate change glacier Svalbard The Cryosphere Tidewater |
op_relation |
The Cryosphere Vallot , D , Åström , J , Zwinger , T , Pettersson , R , Everett , A , Benn , D I , Luckman , A , van Pelt , W J J , Nick , F & Kohler , J 2018 , ' Effects of undercutting and sliding on calving : a global approach applied to Kronebreen, Svalbard ' , The Cryosphere , vol. 12 , no. 2 , pp. 609-625 . https://doi.org/10.5194/tc-12-609-2018 1994-0416 PURE: 252359351 PURE UUID: dc50bede-cf7b-4566-8536-5d87aec3876a Bibtex: urn:59992076fd0eceff5d113a59e5150a81 Scopus: 85042457214 WOS: 000425729800002 ORCID: /0000-0002-3604-0886/work/64697369 http://hdl.handle.net/10023/12768 https://doi.org/10.5194/tc-12-609-2018 |
op_rights |
© Author(s) 2018. Open Access article. This work is distributed under the Creative Commons Attribution 4.0 License. |
op_doi |
https://doi.org/10.5194/tc-12-609-2018 |
container_title |
The Cryosphere |
container_volume |
12 |
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2 |
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609 |
op_container_end_page |
625 |
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1770270931412844544 |