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 |
---|---|
Main Authors: | , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Nature Research
2023
|
Subjects: | |
Online Access: | https://eprints.gla.ac.uk/289279/ https://eprints.gla.ac.uk/289279/1/289279.pdf |
id |
ftuglasgow:oai:eprints.gla.ac.uk:289279 |
---|---|
record_format |
openpolar |
spelling |
ftuglasgow:oai:eprints.gla.ac.uk:289279 2023-05-15T13:47:28+02:00 A topographic hinge-zone divides coastal and inland ice dynamic regimes in East Antarctica Andersen, Jane L. Newall, Jennifer C. Fredin, Ola Glasser, Neil F. Lifton, Nathaniel A. Stuart, Finlay M. Fabel, Derek Caffee, Marc Pedersen, Vivi K. Koester, Alexandria J. Suganuma, Yusuke Harbor, Jonathan M. Stroeven, Arjen P. 2023-01-05 text https://eprints.gla.ac.uk/289279/ https://eprints.gla.ac.uk/289279/1/289279.pdf en eng Nature Research https://eprints.gla.ac.uk/289279/1/289279.pdf Andersen, J. L. et al. (2023) A topographic hinge-zone divides coastal and inland ice dynamic regimes in East Antarctica. Communications Earth and Environment <https://eprints.gla.ac.uk/view/journal_volume/Communications_Earth_and_Environment.html>, 4(1), 9. (doi:10.1038/s43247-022-00673-6 <https://doi.org/10.1038/s43247-022-00673-6>) cc_by_4 CC-BY Articles PeerReviewed 2023 ftuglasgow https://doi.org/10.1038/s43247-022-00673-6 2023-01-12T23:09:32Z 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 University of Glasgow: Enlighten - Publications 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 |
University of Glasgow: Enlighten - Publications |
op_collection_id |
ftuglasgow |
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 L. Newall, Jennifer C. Fredin, Ola Glasser, Neil F. Lifton, Nathaniel A. Stuart, Finlay M. Fabel, Derek Caffee, Marc Pedersen, Vivi K. Koester, Alexandria J. Suganuma, Yusuke Harbor, Jonathan M. Stroeven, Arjen P. |
spellingShingle |
Andersen, Jane L. Newall, Jennifer C. Fredin, Ola Glasser, Neil F. Lifton, Nathaniel A. Stuart, Finlay M. Fabel, Derek Caffee, Marc Pedersen, Vivi K. Koester, Alexandria J. 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 L. Newall, Jennifer C. Fredin, Ola Glasser, Neil F. Lifton, Nathaniel A. Stuart, Finlay M. Fabel, Derek Caffee, Marc Pedersen, Vivi K. Koester, Alexandria J. Suganuma, Yusuke Harbor, Jonathan M. Stroeven, Arjen P. |
author_sort |
Andersen, Jane L. |
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 |
Nature Research |
publishDate |
2023 |
url |
https://eprints.gla.ac.uk/289279/ https://eprints.gla.ac.uk/289279/1/289279.pdf |
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_relation |
https://eprints.gla.ac.uk/289279/1/289279.pdf Andersen, J. L. et al. (2023) A topographic hinge-zone divides coastal and inland ice dynamic regimes in East Antarctica. Communications Earth and Environment <https://eprints.gla.ac.uk/view/journal_volume/Communications_Earth_and_Environment.html>, 4(1), 9. (doi:10.1038/s43247-022-00673-6 <https://doi.org/10.1038/s43247-022-00673-6>) |
op_rights |
cc_by_4 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1038/s43247-022-00673-6 |
container_title |
Communications Earth & Environment |
container_volume |
4 |
container_issue |
1 |
_version_ |
1766247193158615040 |