Rapid dynamic activation of a marine-based Arctic ice cap
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 pre...
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ftulancaster:oai:eprints.lancs.ac.uk:79031 2024-05-19T07:33:23+00:00 Rapid dynamic activation of a marine-based Arctic ice cap McMillan, Malcolm Shepherd, Andrew Gourmelen, Noel Dehecq, Amaury Leeson, Amber Ridout, Andrew Flament, Thomas Hogg, Anna Gilbert, Lin Benham, Toby Van Den Broeke, Michiel Dowdeswell, Julian A. Fettweis, Xavier Noël, Brice Strozzi, Tazio 2015-01-27 application/pdf https://eprints.lancs.ac.uk/id/eprint/79031/ https://eprints.lancs.ac.uk/id/eprint/79031/1/McMillan_et_al_2014_Geophysical_Research_Letters.pdf en eng https://eprints.lancs.ac.uk/id/eprint/79031/1/McMillan_et_al_2014_Geophysical_Research_Letters.pdf McMillan, Malcolm and Shepherd, Andrew and Gourmelen, Noel and Dehecq, Amaury and Leeson, Amber and Ridout, Andrew and Flament, Thomas and Hogg, Anna and Gilbert, Lin and Benham, Toby and Van Den Broeke, Michiel and Dowdeswell, Julian A. and Fettweis, Xavier and Noël, Brice and Strozzi, Tazio (2015) Rapid dynamic activation of a marine-based Arctic ice cap. Geophysical Research Letters, 41 (24). pp. 8902-8909. ISSN 0094-8276 creative_commons_attribution_4_0_international_license Journal Article PeerReviewed 2015 ftulancaster 2024-04-23T23:36:48Z 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. Key Points Recent dynamic activation of a formerly slow-flowing marine Arctic ice capImbalance has spread 50 km inland to within 8 km of the ice cap summitIce discharge has increased 45-fold, and thinning rates have exceeded 25 m/yr Article in Journal/Newspaper Arctic Arctic Austfonna Ice cap Lancaster University: Lancaster Eprints Geophysical Research Letters 41 24 8902 8909 |
institution |
Open Polar |
collection |
Lancaster University: Lancaster Eprints |
op_collection_id |
ftulancaster |
language |
English |
description |
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. Key Points Recent dynamic activation of a formerly slow-flowing marine Arctic ice capImbalance has spread 50 km inland to within 8 km of the ice cap summitIce discharge has increased 45-fold, and thinning rates have exceeded 25 m/yr |
format |
Article in Journal/Newspaper |
author |
McMillan, Malcolm Shepherd, Andrew Gourmelen, Noel Dehecq, Amaury Leeson, Amber Ridout, Andrew Flament, Thomas Hogg, Anna Gilbert, Lin Benham, Toby Van Den Broeke, Michiel Dowdeswell, Julian A. Fettweis, Xavier Noël, Brice Strozzi, Tazio |
spellingShingle |
McMillan, Malcolm Shepherd, Andrew Gourmelen, Noel Dehecq, Amaury Leeson, Amber Ridout, Andrew Flament, Thomas Hogg, Anna Gilbert, Lin Benham, Toby Van Den Broeke, Michiel Dowdeswell, Julian A. Fettweis, Xavier Noël, Brice Strozzi, Tazio Rapid dynamic activation of a marine-based Arctic ice cap |
author_facet |
McMillan, Malcolm Shepherd, Andrew Gourmelen, Noel Dehecq, Amaury Leeson, Amber Ridout, Andrew Flament, Thomas Hogg, Anna Gilbert, Lin Benham, Toby Van Den Broeke, Michiel Dowdeswell, Julian A. Fettweis, Xavier Noël, Brice Strozzi, Tazio |
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 |
publishDate |
2015 |
url |
https://eprints.lancs.ac.uk/id/eprint/79031/ https://eprints.lancs.ac.uk/id/eprint/79031/1/McMillan_et_al_2014_Geophysical_Research_Letters.pdf |
genre |
Arctic Arctic Austfonna Ice cap |
genre_facet |
Arctic Arctic Austfonna Ice cap |
op_relation |
https://eprints.lancs.ac.uk/id/eprint/79031/1/McMillan_et_al_2014_Geophysical_Research_Letters.pdf McMillan, Malcolm and Shepherd, Andrew and Gourmelen, Noel and Dehecq, Amaury and Leeson, Amber and Ridout, Andrew and Flament, Thomas and Hogg, Anna and Gilbert, Lin and Benham, Toby and Van Den Broeke, Michiel and Dowdeswell, Julian A. and Fettweis, Xavier and Noël, Brice and Strozzi, Tazio (2015) Rapid dynamic activation of a marine-based Arctic ice cap. Geophysical Research Letters, 41 (24). pp. 8902-8909. ISSN 0094-8276 |
op_rights |
creative_commons_attribution_4_0_international_license |
container_title |
Geophysical Research Letters |
container_volume |
41 |
container_issue |
24 |
container_start_page |
8902 |
op_container_end_page |
8909 |
_version_ |
1799471445280030720 |