Melt-under-cutting and buoyancy-driven calving from tidewater glaciers: new insights from discrete element and continuum model simulations
ABSTRACT The simple calving laws currently used in ice-sheet models do not adequately reflect the complexity and diversity of calving processes. To be effective, calving laws must be grounded in a sound understanding of how calving actually works. Here, we develop a new strategy for formulating calv...
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Cambridge University Press (CUP)
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Online Access: | http://dx.doi.org/10.1017/jog.2017.41 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143017000417 |
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crcambridgeupr:10.1017/jog.2017.41 2024-05-19T07:42:10+00:00 Melt-under-cutting and buoyancy-driven calving from tidewater glaciers: new insights from discrete element and continuum model simulations BENN, DOUGLAS I. ÅSTRÖM, JAN ZWINGER, THOMAS TODD, JOE NICK, FAEZEH M. COOK, SUSAN HULTON, NICHOLAS R. J. LUCKMAN, ADRIAN 2017 http://dx.doi.org/10.1017/jog.2017.41 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143017000417 en eng Cambridge University Press (CUP) http://creativecommons.org/licenses/by/4.0/ Journal of Glaciology volume 63, issue 240, page 691-702 ISSN 0022-1430 1727-5652 journal-article 2017 crcambridgeupr https://doi.org/10.1017/jog.2017.41 2024-04-25T06:51:42Z ABSTRACT The simple calving laws currently used in ice-sheet models do not adequately reflect the complexity and diversity of calving processes. To be effective, calving laws must be grounded in a sound understanding of how calving actually works. Here, we develop a new strategy for formulating calving laws, using (a) the Helsinki Discrete Element Model (HiDEM) to explicitly model fracture and calving processes, and (b) the continuum model Elmer/Ice to identify critical stress states associated with HiDEM calving events. A range of observed calving processes emerges spontaneously from HiDEM in response to variations in ice-front buoyancy and the size of subaqueous undercuts. Calving driven by buoyancy and melt under-cutting is under-predicted by existing calving laws, but we show that the location and magnitude of HiDEM calving events can be predicted in Elmer/Ice from characteristic stress patterns. Our results open the way to developing calving laws that properly reflect the diversity of calving processes, and provide a framework for a unified theory of the calving process continuum. Article in Journal/Newspaper Ice Sheet Journal of Glaciology Cambridge University Press Journal of Glaciology 63 240 691 702 |
institution |
Open Polar |
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Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
description |
ABSTRACT The simple calving laws currently used in ice-sheet models do not adequately reflect the complexity and diversity of calving processes. To be effective, calving laws must be grounded in a sound understanding of how calving actually works. Here, we develop a new strategy for formulating calving laws, using (a) the Helsinki Discrete Element Model (HiDEM) to explicitly model fracture and calving processes, and (b) the continuum model Elmer/Ice to identify critical stress states associated with HiDEM calving events. A range of observed calving processes emerges spontaneously from HiDEM in response to variations in ice-front buoyancy and the size of subaqueous undercuts. Calving driven by buoyancy and melt under-cutting is under-predicted by existing calving laws, but we show that the location and magnitude of HiDEM calving events can be predicted in Elmer/Ice from characteristic stress patterns. Our results open the way to developing calving laws that properly reflect the diversity of calving processes, and provide a framework for a unified theory of the calving process continuum. |
format |
Article in Journal/Newspaper |
author |
BENN, DOUGLAS I. ÅSTRÖM, JAN ZWINGER, THOMAS TODD, JOE NICK, FAEZEH M. COOK, SUSAN HULTON, NICHOLAS R. J. LUCKMAN, ADRIAN |
spellingShingle |
BENN, DOUGLAS I. ÅSTRÖM, JAN ZWINGER, THOMAS TODD, JOE NICK, FAEZEH M. COOK, SUSAN HULTON, NICHOLAS R. J. LUCKMAN, ADRIAN Melt-under-cutting and buoyancy-driven calving from tidewater glaciers: new insights from discrete element and continuum model simulations |
author_facet |
BENN, DOUGLAS I. ÅSTRÖM, JAN ZWINGER, THOMAS TODD, JOE NICK, FAEZEH M. COOK, SUSAN HULTON, NICHOLAS R. J. LUCKMAN, ADRIAN |
author_sort |
BENN, DOUGLAS I. |
title |
Melt-under-cutting and buoyancy-driven calving from tidewater glaciers: new insights from discrete element and continuum model simulations |
title_short |
Melt-under-cutting and buoyancy-driven calving from tidewater glaciers: new insights from discrete element and continuum model simulations |
title_full |
Melt-under-cutting and buoyancy-driven calving from tidewater glaciers: new insights from discrete element and continuum model simulations |
title_fullStr |
Melt-under-cutting and buoyancy-driven calving from tidewater glaciers: new insights from discrete element and continuum model simulations |
title_full_unstemmed |
Melt-under-cutting and buoyancy-driven calving from tidewater glaciers: new insights from discrete element and continuum model simulations |
title_sort |
melt-under-cutting and buoyancy-driven calving from tidewater glaciers: new insights from discrete element and continuum model simulations |
publisher |
Cambridge University Press (CUP) |
publishDate |
2017 |
url |
http://dx.doi.org/10.1017/jog.2017.41 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143017000417 |
genre |
Ice Sheet Journal of Glaciology |
genre_facet |
Ice Sheet Journal of Glaciology |
op_source |
Journal of Glaciology volume 63, issue 240, page 691-702 ISSN 0022-1430 1727-5652 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1017/jog.2017.41 |
container_title |
Journal of Glaciology |
container_volume |
63 |
container_issue |
240 |
container_start_page |
691 |
op_container_end_page |
702 |
_version_ |
1799481821237346304 |