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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Language: | English |
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Online Access: | https://pure.au.dk/portal/en/publications/87fd006b-f02c-437d-b3e3-c18196567830 https://doi.org/10.1038/s43247-022-00673-6 |
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ftuniaarhuspubl:oai:pure.atira.dk:publications/87fd006b-f02c-437d-b3e3-c18196567830 2024-06-23T07:46:48+00:00 A topographic hinge-zone divides coastal and inland ice dynamic regimes in East Antarctica Andersen, Jane Lund Newall, Jennifer C. Fredin, Ola Glasser, Neil F. Lifton, Nathaniel Stuart, Finlay Fabel, Derek Caffee, Marc W. Pedersen, Vivi Kathrine Koester, Alexandria Suganuma, Yusuke Harbor, Jonathan M. Stroeven, Arjen P. 2023-01 https://pure.au.dk/portal/en/publications/87fd006b-f02c-437d-b3e3-c18196567830 https://doi.org/10.1038/s43247-022-00673-6 eng eng https://pure.au.dk/portal/en/publications/87fd006b-f02c-437d-b3e3-c18196567830 info:eu-repo/semantics/openAccess Andersen , J L , Newall , J C , Fredin , O , Glasser , N F , Lifton , N , Stuart , F , Fabel , D , Caffee , M W , Pedersen , V K , Koester , A , Suganuma , Y , Harbor , J M & Stroeven , A P 2023 , ' A topographic hinge-zone divides coastal and inland ice dynamic regimes in East Antarctica ' , Communications Earth & Environment , vol. 4 , no. 1 , 9 . https://doi.org/10.1038/s43247-022-00673-6 article 2023 ftuniaarhuspubl https://doi.org/10.1038/s43247-022-00673-6 2024-06-11T14:22:51Z 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. Article in Journal/Newspaper Antarc* Antarctic Antarctica Dronning Maud Land East Antarctica Ice Sheet Aarhus University: Research Antarctic Dronning Maud Land East Antarctic Ice Sheet East Antarctica Polar Plateau ENVELOPE(0.000,0.000,-90.000,-90.000) Communications Earth & Environment 4 1 |
institution |
Open Polar |
collection |
Aarhus University: Research |
op_collection_id |
ftuniaarhuspubl |
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. |
format |
Article in Journal/Newspaper |
author |
Andersen, Jane Lund Newall, Jennifer C. Fredin, Ola Glasser, Neil F. Lifton, Nathaniel Stuart, Finlay Fabel, Derek Caffee, Marc W. Pedersen, Vivi Kathrine Koester, Alexandria Suganuma, Yusuke Harbor, Jonathan M. Stroeven, Arjen P. |
spellingShingle |
Andersen, Jane Lund Newall, Jennifer C. Fredin, Ola Glasser, Neil F. Lifton, Nathaniel Stuart, Finlay Fabel, Derek Caffee, Marc W. Pedersen, Vivi Kathrine Koester, Alexandria Suganuma, 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, Jennifer C. Fredin, Ola Glasser, Neil F. Lifton, Nathaniel Stuart, Finlay Fabel, Derek Caffee, Marc W. Pedersen, Vivi Kathrine Koester, Alexandria Suganuma, 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 |
publishDate |
2023 |
url |
https://pure.au.dk/portal/en/publications/87fd006b-f02c-437d-b3e3-c18196567830 https://doi.org/10.1038/s43247-022-00673-6 |
long_lat |
ENVELOPE(0.000,0.000,-90.000,-90.000) |
geographic |
Antarctic Dronning Maud Land East Antarctic Ice Sheet East Antarctica Polar Plateau |
geographic_facet |
Antarctic Dronning Maud Land East Antarctic Ice Sheet East Antarctica 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 |
Andersen , J L , Newall , J C , Fredin , O , Glasser , N F , Lifton , N , Stuart , F , Fabel , D , Caffee , M W , Pedersen , V K , Koester , A , Suganuma , Y , Harbor , J M & Stroeven , A P 2023 , ' A topographic hinge-zone divides coastal and inland ice dynamic regimes in East Antarctica ' , Communications Earth & Environment , vol. 4 , no. 1 , 9 . https://doi.org/10.1038/s43247-022-00673-6 |
op_relation |
https://pure.au.dk/portal/en/publications/87fd006b-f02c-437d-b3e3-c18196567830 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1038/s43247-022-00673-6 |
container_title |
Communications Earth & Environment |
container_volume |
4 |
container_issue |
1 |
_version_ |
1802648343345627136 |