Modelling calving front dynamics using a level-set method: application to Jakobshavn Isbræ, West Greenland
Calving is a major mechanism of ice discharge of the Antarctic and Greenland ice sheets, and a change in calving front position affects the entire stress regime of marine terminating glaciers. The representation of calving front dynamics in a 2-D or 3-D ice sheet model remains non-trivial. Here, we...
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ftcdlib:oai:escholarship.org:ark:/13030/qt6mn322bm 2023-06-18T03:36:51+02:00 Modelling calving front dynamics using a level-set method: application to Jakobshavn Isbræ, West Greenland Bondzio, Johannes H Seroussi, Hélène Morlighem, Mathieu Kleiner, Thomas Rückamp, Martin Humbert, Angelika Larour, Eric Y 497 - 510 2016-03-03 application/pdf https://escholarship.org/uc/item/6mn322bm unknown eScholarship, University of California qt6mn322bm https://escholarship.org/uc/item/6mn322bm public The Cryosphere, vol 10, iss 2 Climate Action Oceanography Physical Geography and Environmental Geoscience Meteorology & Atmospheric Sciences article 2016 ftcdlib 2023-06-05T18:01:05Z Calving is a major mechanism of ice discharge of the Antarctic and Greenland ice sheets, and a change in calving front position affects the entire stress regime of marine terminating glaciers. The representation of calving front dynamics in a 2-D or 3-D ice sheet model remains non-trivial. Here, we present the theoretical and technical framework for a level-set method, an implicit boundary tracking scheme, which we implement into the Ice Sheet System Model (ISSM). This scheme allows us to study the dynamic response of a drainage basin to user-defined calving rates. We apply the method to Jakobshavn Isbræ, a major marine terminating outlet glacier of the West Greenland Ice Sheet. The model robustly reproduces the high sensitivity of the glacier to calving, and we find that enhanced calving triggers significant acceleration of the ice stream. Upstream acceleration is sustained through a combination of mechanisms. However, both lateral stress and ice influx stabilize the ice stream. This study provides new insights into the ongoing changes occurring at Jakobshavn Isbræ and emphasizes that the incorporation of moving boundaries and dynamic lateral effects, not captured in flow-line models, is key for realistic model projections of sea level rise on centennial timescales. Article in Journal/Newspaper Antarc* Antarctic glacier Greenland Ice Sheet Jakobshavn Jakobshavn isbræ The Cryosphere University of California: eScholarship Antarctic Greenland Jakobshavn Isbræ ENVELOPE(-49.917,-49.917,69.167,69.167) The Antarctic |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Climate Action Oceanography Physical Geography and Environmental Geoscience Meteorology & Atmospheric Sciences |
spellingShingle |
Climate Action Oceanography Physical Geography and Environmental Geoscience Meteorology & Atmospheric Sciences Bondzio, Johannes H Seroussi, Hélène Morlighem, Mathieu Kleiner, Thomas Rückamp, Martin Humbert, Angelika Larour, Eric Y Modelling calving front dynamics using a level-set method: application to Jakobshavn Isbræ, West Greenland |
topic_facet |
Climate Action Oceanography Physical Geography and Environmental Geoscience Meteorology & Atmospheric Sciences |
description |
Calving is a major mechanism of ice discharge of the Antarctic and Greenland ice sheets, and a change in calving front position affects the entire stress regime of marine terminating glaciers. The representation of calving front dynamics in a 2-D or 3-D ice sheet model remains non-trivial. Here, we present the theoretical and technical framework for a level-set method, an implicit boundary tracking scheme, which we implement into the Ice Sheet System Model (ISSM). This scheme allows us to study the dynamic response of a drainage basin to user-defined calving rates. We apply the method to Jakobshavn Isbræ, a major marine terminating outlet glacier of the West Greenland Ice Sheet. The model robustly reproduces the high sensitivity of the glacier to calving, and we find that enhanced calving triggers significant acceleration of the ice stream. Upstream acceleration is sustained through a combination of mechanisms. However, both lateral stress and ice influx stabilize the ice stream. This study provides new insights into the ongoing changes occurring at Jakobshavn Isbræ and emphasizes that the incorporation of moving boundaries and dynamic lateral effects, not captured in flow-line models, is key for realistic model projections of sea level rise on centennial timescales. |
format |
Article in Journal/Newspaper |
author |
Bondzio, Johannes H Seroussi, Hélène Morlighem, Mathieu Kleiner, Thomas Rückamp, Martin Humbert, Angelika Larour, Eric Y |
author_facet |
Bondzio, Johannes H Seroussi, Hélène Morlighem, Mathieu Kleiner, Thomas Rückamp, Martin Humbert, Angelika Larour, Eric Y |
author_sort |
Bondzio, Johannes H |
title |
Modelling calving front dynamics using a level-set method: application to Jakobshavn Isbræ, West Greenland |
title_short |
Modelling calving front dynamics using a level-set method: application to Jakobshavn Isbræ, West Greenland |
title_full |
Modelling calving front dynamics using a level-set method: application to Jakobshavn Isbræ, West Greenland |
title_fullStr |
Modelling calving front dynamics using a level-set method: application to Jakobshavn Isbræ, West Greenland |
title_full_unstemmed |
Modelling calving front dynamics using a level-set method: application to Jakobshavn Isbræ, West Greenland |
title_sort |
modelling calving front dynamics using a level-set method: application to jakobshavn isbræ, west greenland |
publisher |
eScholarship, University of California |
publishDate |
2016 |
url |
https://escholarship.org/uc/item/6mn322bm |
op_coverage |
497 - 510 |
long_lat |
ENVELOPE(-49.917,-49.917,69.167,69.167) |
geographic |
Antarctic Greenland Jakobshavn Isbræ The Antarctic |
geographic_facet |
Antarctic Greenland Jakobshavn Isbræ The Antarctic |
genre |
Antarc* Antarctic glacier Greenland Ice Sheet Jakobshavn Jakobshavn isbræ The Cryosphere |
genre_facet |
Antarc* Antarctic glacier Greenland Ice Sheet Jakobshavn Jakobshavn isbræ The Cryosphere |
op_source |
The Cryosphere, vol 10, iss 2 |
op_relation |
qt6mn322bm https://escholarship.org/uc/item/6mn322bm |
op_rights |
public |
_version_ |
1769008645643698176 |