Rapid dynamic activation of a marine-based Arctic ice cap
International audience We use satellite observations to document rapid acceleration and ice loss from a formerly slow-flowing, marine-based sector of Austfonna, the largest ice cap in the Eurasian Arctic. During the past two decades, the sector ice discharge has increased 45-fold, the velocity regim...
Published in: | Geophysical Research Letters |
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Online Access: | https://hal.archives-ouvertes.fr/hal-01102899 https://doi.org/10.1002/2014GL062255 |
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ftccsdartic:oai:HAL:hal-01102899v1 2023-05-15T14:55:17+02:00 Rapid dynamic activation of a marine-based Arctic ice cap Mcmillan, Malcolm Shepherd, Andrew Gourmelen, Noel Dehecq, Amaury Leeson, Amber Ridout, Andrew Flament, Thomas Gilbert, Lin Benham, Toby Van Den Broeke, Michiel Dowdeswell, J.A. Fettweis, Xavier Noël, Brice Strozzi, T. Centre for Polar Observation and Modelling, University of Leeds (CPOM) University of Leeds-Natural Environment Research Council (NERC) Centre for Polar Observation and Modelling (CPOM) Natural Environment Research Council (NERC) School of Geosciences Edinburgh University of Edinburgh Laboratoire d'Informatique, Systèmes, Traitement de l'Information et de la Connaissance (LISTIC) Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry ) Scott Polar Research Institute University of Cambridge UK (CAM) Institute for Marine and Atmospheric Research Utrecht (IMAU) Utrecht University Utrecht Département de Géographie Université de Liège Gamma Remote Sensing and Consulting AG Gamma Remote Sensing Research and Consulting AG 2014 https://hal.archives-ouvertes.fr/hal-01102899 https://doi.org/10.1002/2014GL062255 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1002/2014GL062255 hal-01102899 https://hal.archives-ouvertes.fr/hal-01102899 doi:10.1002/2014GL062255 ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal.archives-ouvertes.fr/hal-01102899 Geophysical Research Letters, American Geophysical Union, 2014, pp.2014GL062255. ⟨10.1002/2014GL062255⟩ [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] info:eu-repo/semantics/article Journal articles 2014 ftccsdartic https://doi.org/10.1002/2014GL062255 2021-11-28T01:17:40Z International audience We use satellite observations to document rapid acceleration and ice loss from a formerly slow-flowing, marine-based sector of Austfonna, the largest ice cap in the Eurasian Arctic. During the past two decades, the sector ice discharge has increased 45-fold, the velocity regime has switched from predominantly slow (~ 101 m/yr) to fast (~ 103 m/yr) flow, and rates of ice thinning have exceeded 25 m/yr. At the time of widespread dynamic activation, parts of the terminus may have been near floatation. Subsequently, the imbalance has propagated 50 km inland to within 8 km of the ice cap summit. Our observations demonstrate the ability of slow-flowing ice to mobilize and quickly transmit the dynamic imbalance inland; a process that we show has initiated rapid ice loss to the ocean and redistribution of ice mass to locations more susceptible to melt, yet which remains poorly understood. Article in Journal/Newspaper Arctic Austfonna Ice cap Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Arctic Austfonna ENVELOPE(24.559,24.559,79.835,79.835) Geophysical Research Letters 41 24 8902 8909 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] |
spellingShingle |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] Mcmillan, Malcolm Shepherd, Andrew Gourmelen, Noel Dehecq, Amaury Leeson, Amber Ridout, Andrew Flament, Thomas Gilbert, Lin Benham, Toby Van Den Broeke, Michiel Dowdeswell, J.A. Fettweis, Xavier Noël, Brice Strozzi, T. Rapid dynamic activation of a marine-based Arctic ice cap |
topic_facet |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] |
description |
International audience We use satellite observations to document rapid acceleration and ice loss from a formerly slow-flowing, marine-based sector of Austfonna, the largest ice cap in the Eurasian Arctic. During the past two decades, the sector ice discharge has increased 45-fold, the velocity regime has switched from predominantly slow (~ 101 m/yr) to fast (~ 103 m/yr) flow, and rates of ice thinning have exceeded 25 m/yr. At the time of widespread dynamic activation, parts of the terminus may have been near floatation. Subsequently, the imbalance has propagated 50 km inland to within 8 km of the ice cap summit. Our observations demonstrate the ability of slow-flowing ice to mobilize and quickly transmit the dynamic imbalance inland; a process that we show has initiated rapid ice loss to the ocean and redistribution of ice mass to locations more susceptible to melt, yet which remains poorly understood. |
author2 |
Centre for Polar Observation and Modelling, University of Leeds (CPOM) University of Leeds-Natural Environment Research Council (NERC) Centre for Polar Observation and Modelling (CPOM) Natural Environment Research Council (NERC) School of Geosciences Edinburgh University of Edinburgh Laboratoire d'Informatique, Systèmes, Traitement de l'Information et de la Connaissance (LISTIC) Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry ) Scott Polar Research Institute University of Cambridge UK (CAM) Institute for Marine and Atmospheric Research Utrecht (IMAU) Utrecht University Utrecht Département de Géographie Université de Liège Gamma Remote Sensing and Consulting AG Gamma Remote Sensing Research and Consulting AG |
format |
Article in Journal/Newspaper |
author |
Mcmillan, Malcolm Shepherd, Andrew Gourmelen, Noel Dehecq, Amaury Leeson, Amber Ridout, Andrew Flament, Thomas Gilbert, Lin Benham, Toby Van Den Broeke, Michiel Dowdeswell, J.A. Fettweis, Xavier Noël, Brice Strozzi, T. |
author_facet |
Mcmillan, Malcolm Shepherd, Andrew Gourmelen, Noel Dehecq, Amaury Leeson, Amber Ridout, Andrew Flament, Thomas Gilbert, Lin Benham, Toby Van Den Broeke, Michiel Dowdeswell, J.A. Fettweis, Xavier Noël, Brice Strozzi, T. |
author_sort |
Mcmillan, Malcolm |
title |
Rapid dynamic activation of a marine-based Arctic ice cap |
title_short |
Rapid dynamic activation of a marine-based Arctic ice cap |
title_full |
Rapid dynamic activation of a marine-based Arctic ice cap |
title_fullStr |
Rapid dynamic activation of a marine-based Arctic ice cap |
title_full_unstemmed |
Rapid dynamic activation of a marine-based Arctic ice cap |
title_sort |
rapid dynamic activation of a marine-based arctic ice cap |
publisher |
HAL CCSD |
publishDate |
2014 |
url |
https://hal.archives-ouvertes.fr/hal-01102899 https://doi.org/10.1002/2014GL062255 |
long_lat |
ENVELOPE(24.559,24.559,79.835,79.835) |
geographic |
Arctic Austfonna |
geographic_facet |
Arctic Austfonna |
genre |
Arctic Austfonna Ice cap |
genre_facet |
Arctic Austfonna Ice cap |
op_source |
ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal.archives-ouvertes.fr/hal-01102899 Geophysical Research Letters, American Geophysical Union, 2014, pp.2014GL062255. ⟨10.1002/2014GL062255⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/2014GL062255 hal-01102899 https://hal.archives-ouvertes.fr/hal-01102899 doi:10.1002/2014GL062255 |
op_doi |
https://doi.org/10.1002/2014GL062255 |
container_title |
Geophysical Research Letters |
container_volume |
41 |
container_issue |
24 |
container_start_page |
8902 |
op_container_end_page |
8909 |
_version_ |
1766327082160226304 |