Exceptions to bed-controlled ice sheet flow and retreat from glaciated continental margins worldwide
Projections of ice sheet behavior hinge on how ice flow velocity evolves and the extent to which marine-based grounding lines are stable. Ice flow and grounding line retreat are variably governed by the coupling between the ice and underlying terrain. We ask to what degree catchment-scale bed charac...
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American Association for the Advancement of Science
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Online Access: | https://hdl.handle.net/10037/20314 https://doi.org/10.1126/sciadv.abb6291 |
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ftunivtroemsoe:oai:munin.uit.no:10037/20314 2023-05-15T14:26:59+02:00 Exceptions to bed-controlled ice sheet flow and retreat from glaciated continental margins worldwide Greenwood, Sarah L. Simkins, Lauren M Winsborrow, Monica Bjarnadóttir, Lilja Rún 2021-01-13 https://hdl.handle.net/10037/20314 https://doi.org/10.1126/sciadv.abb6291 eng eng American Association for the Advancement of Science Science Advances Andre: NGU Andre: INQUA Coastal and Marine Processes grant 1602P info:eu-repo/grantAgreement/RCN/SFF/223259/Norway/Centre for Arctic Gas Hydrate, Environment and Climate/CAGE/ Greenwood SL, Simkins, Winsborrow M, Bjarnadóttir LR. Exceptions to bed-controlled ice sheet flow and retreat from glaciated continental margins worldwide. Science Advances. 2021;7(3):1-12 FRIDAID 1873266 doi:10.1126/sciadv.abb6291 2375-2548 https://hdl.handle.net/10037/20314 openAccess Copyright 2021 The Author(s) VDP::Mathematics and natural science: 400::Geosciences: 450 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 Journal article Tidsskriftartikkel Peer reviewed publishedVersion 2021 ftunivtroemsoe https://doi.org/10.1126/sciadv.abb6291 2021-06-25T17:58:00Z Projections of ice sheet behavior hinge on how ice flow velocity evolves and the extent to which marine-based grounding lines are stable. Ice flow and grounding line retreat are variably governed by the coupling between the ice and underlying terrain. We ask to what degree catchment-scale bed characteristics determine ice flow and retreat, drawing on paleo-ice sheet landform imprints from 99 sites on continental shelves worldwide. We find that topographic setting has broadly steered ice flow and that the bed slope favors particular styles of retreat. However, we find exceptions to accepted “rules” of behavior: Regional topographic highs are not always an impediment to fast ice flow, retreat may proceed in a controlled, steady manner on reverse slopes and, unexpectedly, the occurrence of ice streaming is not favored on a particular geological substrate. Furthermore, once grounding line retreat is under way, readvance is rarely observed regardless of regional bed characteristics. Article in Journal/Newspaper Arctic Ice Sheet University of Tromsø: Munin Open Research Archive Science Advances 7 3 eabb6291 |
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Open Polar |
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University of Tromsø: Munin Open Research Archive |
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ftunivtroemsoe |
language |
English |
topic |
VDP::Mathematics and natural science: 400::Geosciences: 450 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 |
spellingShingle |
VDP::Mathematics and natural science: 400::Geosciences: 450 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 Greenwood, Sarah L. Simkins, Lauren M Winsborrow, Monica Bjarnadóttir, Lilja Rún Exceptions to bed-controlled ice sheet flow and retreat from glaciated continental margins worldwide |
topic_facet |
VDP::Mathematics and natural science: 400::Geosciences: 450 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 |
description |
Projections of ice sheet behavior hinge on how ice flow velocity evolves and the extent to which marine-based grounding lines are stable. Ice flow and grounding line retreat are variably governed by the coupling between the ice and underlying terrain. We ask to what degree catchment-scale bed characteristics determine ice flow and retreat, drawing on paleo-ice sheet landform imprints from 99 sites on continental shelves worldwide. We find that topographic setting has broadly steered ice flow and that the bed slope favors particular styles of retreat. However, we find exceptions to accepted “rules” of behavior: Regional topographic highs are not always an impediment to fast ice flow, retreat may proceed in a controlled, steady manner on reverse slopes and, unexpectedly, the occurrence of ice streaming is not favored on a particular geological substrate. Furthermore, once grounding line retreat is under way, readvance is rarely observed regardless of regional bed characteristics. |
format |
Article in Journal/Newspaper |
author |
Greenwood, Sarah L. Simkins, Lauren M Winsborrow, Monica Bjarnadóttir, Lilja Rún |
author_facet |
Greenwood, Sarah L. Simkins, Lauren M Winsborrow, Monica Bjarnadóttir, Lilja Rún |
author_sort |
Greenwood, Sarah L. |
title |
Exceptions to bed-controlled ice sheet flow and retreat from glaciated continental margins worldwide |
title_short |
Exceptions to bed-controlled ice sheet flow and retreat from glaciated continental margins worldwide |
title_full |
Exceptions to bed-controlled ice sheet flow and retreat from glaciated continental margins worldwide |
title_fullStr |
Exceptions to bed-controlled ice sheet flow and retreat from glaciated continental margins worldwide |
title_full_unstemmed |
Exceptions to bed-controlled ice sheet flow and retreat from glaciated continental margins worldwide |
title_sort |
exceptions to bed-controlled ice sheet flow and retreat from glaciated continental margins worldwide |
publisher |
American Association for the Advancement of Science |
publishDate |
2021 |
url |
https://hdl.handle.net/10037/20314 https://doi.org/10.1126/sciadv.abb6291 |
genre |
Arctic Ice Sheet |
genre_facet |
Arctic Ice Sheet |
op_relation |
Science Advances Andre: NGU Andre: INQUA Coastal and Marine Processes grant 1602P info:eu-repo/grantAgreement/RCN/SFF/223259/Norway/Centre for Arctic Gas Hydrate, Environment and Climate/CAGE/ Greenwood SL, Simkins, Winsborrow M, Bjarnadóttir LR. Exceptions to bed-controlled ice sheet flow and retreat from glaciated continental margins worldwide. Science Advances. 2021;7(3):1-12 FRIDAID 1873266 doi:10.1126/sciadv.abb6291 2375-2548 https://hdl.handle.net/10037/20314 |
op_rights |
openAccess Copyright 2021 The Author(s) |
op_doi |
https://doi.org/10.1126/sciadv.abb6291 |
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Science Advances |
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7 |
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3 |
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eabb6291 |
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