A topographic hinge-zone divides coastal and inland ice dynamic regimes in East Antarctica
The impact of late Cenozoic climate on the East Antarctic Ice Sheet is uncertain. Poorly constrained patterns of relative ice thinning and thickening impair the reconstruction of past ice-sheet dynamics and global sea-level budgets. Here we quantify long-term ice cover of mountains protruding the ic...
Published in: | Communications Earth & Environment |
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Online Access: | https://hdl.handle.net/11250/3059162 https://doi.org/10.1038/s43247-022-00673-6 |
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ftntnutrondheimi:oai:ntnuopen.ntnu.no:11250/3059162 2023-05-15T13:42:26+02:00 A topographic hinge-zone divides coastal and inland ice dynamic regimes in East Antarctica Andersen, Jane Lund Newall, J.C. Fredin, Ola Glasser, Neil F. Lifton, Nathaniel A. Stuart, Finlay M. Fabel, Derek Caffee, Marc Pedersen, Vivi K. Koester, Alexandria Sugunuma, Yusuke Harbor, Jonathan M. Stroeven, Arjen P. 2023 application/pdf https://hdl.handle.net/11250/3059162 https://doi.org/10.1038/s43247-022-00673-6 eng eng Springer Nature urn:issn:2662-4435 https://hdl.handle.net/11250/3059162 https://doi.org/10.1038/s43247-022-00673-6 cristin:2134678 Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no 4 Communications Earth & Environment 9 Peer reviewed Journal article 2023 ftntnutrondheimi https://doi.org/10.1038/s43247-022-00673-6 2023-03-22T23:44:06Z The impact of late Cenozoic climate on the East Antarctic Ice Sheet is uncertain. Poorly constrained patterns of relative ice thinning and thickening impair the reconstruction of past ice-sheet dynamics and global sea-level budgets. Here we quantify long-term ice cover of mountains protruding the ice-sheet surface in western Dronning Maud Land, using cosmogenic Chlorine-36, Aluminium-26, Beryllium-10, and Neon-21 from bedrock in an inverse modeling approach. We find that near-coastal sites experienced ice burial up to 75–97% of time since 1 Ma, while interior sites only experienced brief periods of ice burial, generally <20% of time since 1 Ma. Based on these results, we suggest that the escarpment in Dronning Maud Land acts as a hinge-zone, where ice-dynamic changes driven by grounding-line migration are attenuated inland from the coastal portions of the East Antarctic Ice Sheet, and where precipitation-controlled ice-thickness variations on the polar plateau taper off towards the coast. publishedVersion Article in Journal/Newspaper Antarc* Antarctic Antarctica Dronning Maud Land East Antarctica Ice Sheet NTNU Open Archive (Norwegian University of Science and Technology) Antarctic East Antarctica Dronning Maud Land East Antarctic Ice Sheet Polar Plateau ENVELOPE(0.000,0.000,-90.000,-90.000) Communications Earth & Environment 4 1 |
institution |
Open Polar |
collection |
NTNU Open Archive (Norwegian University of Science and Technology) |
op_collection_id |
ftntnutrondheimi |
language |
English |
description |
The impact of late Cenozoic climate on the East Antarctic Ice Sheet is uncertain. Poorly constrained patterns of relative ice thinning and thickening impair the reconstruction of past ice-sheet dynamics and global sea-level budgets. Here we quantify long-term ice cover of mountains protruding the ice-sheet surface in western Dronning Maud Land, using cosmogenic Chlorine-36, Aluminium-26, Beryllium-10, and Neon-21 from bedrock in an inverse modeling approach. We find that near-coastal sites experienced ice burial up to 75–97% of time since 1 Ma, while interior sites only experienced brief periods of ice burial, generally <20% of time since 1 Ma. Based on these results, we suggest that the escarpment in Dronning Maud Land acts as a hinge-zone, where ice-dynamic changes driven by grounding-line migration are attenuated inland from the coastal portions of the East Antarctic Ice Sheet, and where precipitation-controlled ice-thickness variations on the polar plateau taper off towards the coast. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Andersen, Jane Lund Newall, J.C. Fredin, Ola Glasser, Neil F. Lifton, Nathaniel A. Stuart, Finlay M. Fabel, Derek Caffee, Marc Pedersen, Vivi K. Koester, Alexandria Sugunuma, Yusuke Harbor, Jonathan M. Stroeven, Arjen P. |
spellingShingle |
Andersen, Jane Lund Newall, J.C. Fredin, Ola Glasser, Neil F. Lifton, Nathaniel A. Stuart, Finlay M. Fabel, Derek Caffee, Marc Pedersen, Vivi K. Koester, Alexandria Sugunuma, Yusuke Harbor, Jonathan M. Stroeven, Arjen P. A topographic hinge-zone divides coastal and inland ice dynamic regimes in East Antarctica |
author_facet |
Andersen, Jane Lund Newall, J.C. Fredin, Ola Glasser, Neil F. Lifton, Nathaniel A. Stuart, Finlay M. Fabel, Derek Caffee, Marc Pedersen, Vivi K. Koester, Alexandria Sugunuma, Yusuke Harbor, Jonathan M. Stroeven, Arjen P. |
author_sort |
Andersen, Jane Lund |
title |
A topographic hinge-zone divides coastal and inland ice dynamic regimes in East Antarctica |
title_short |
A topographic hinge-zone divides coastal and inland ice dynamic regimes in East Antarctica |
title_full |
A topographic hinge-zone divides coastal and inland ice dynamic regimes in East Antarctica |
title_fullStr |
A topographic hinge-zone divides coastal and inland ice dynamic regimes in East Antarctica |
title_full_unstemmed |
A topographic hinge-zone divides coastal and inland ice dynamic regimes in East Antarctica |
title_sort |
topographic hinge-zone divides coastal and inland ice dynamic regimes in east antarctica |
publisher |
Springer Nature |
publishDate |
2023 |
url |
https://hdl.handle.net/11250/3059162 https://doi.org/10.1038/s43247-022-00673-6 |
long_lat |
ENVELOPE(0.000,0.000,-90.000,-90.000) |
geographic |
Antarctic East Antarctica Dronning Maud Land East Antarctic Ice Sheet Polar Plateau |
geographic_facet |
Antarctic East Antarctica Dronning Maud Land East Antarctic Ice Sheet Polar Plateau |
genre |
Antarc* Antarctic Antarctica Dronning Maud Land East Antarctica Ice Sheet |
genre_facet |
Antarc* Antarctic Antarctica Dronning Maud Land East Antarctica Ice Sheet |
op_source |
4 Communications Earth & Environment 9 |
op_relation |
urn:issn:2662-4435 https://hdl.handle.net/11250/3059162 https://doi.org/10.1038/s43247-022-00673-6 cristin:2134678 |
op_rights |
Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no |
op_doi |
https://doi.org/10.1038/s43247-022-00673-6 |
container_title |
Communications Earth & Environment |
container_volume |
4 |
container_issue |
1 |
_version_ |
1766167941808652288 |