An assessment of forward and inverse GIA solutions for Antarctica
In this work we assess the most recent estimates of glacial isostatic adjustment (GIA) for Antarctica, including those from both forward and inverse methods. The assessment is based on a comparison of the estimated uplift rates with a set of elastic-corrected GPS vertical velocities. These have been...
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ftunivnewcastle:oai:eprint.ncl.ac.uk:229681 2023-05-15T13:24:03+02:00 An assessment of forward and inverse GIA solutions for Antarctica Martín-Español A King MA Zammit-Mangion A Andrews SB Moore P Bamber JL application/pdf https://eprint.ncl.ac.uk/fulltext.aspx?url=229681/A817CBDC-1530-4E35-863F-FD290895DE6E.pdf&pub_id=229681 unknown Wiley-Blackwell Journal of Geophysical Research: Solid Earth Article ftunivnewcastle 2020-06-11T23:33:36Z In this work we assess the most recent estimates of glacial isostatic adjustment (GIA) for Antarctica, including those from both forward and inverse methods. The assessment is based on a comparison of the estimated uplift rates with a set of elastic-corrected GPS vertical velocities. These have been observed from an extensive GPS network and computed using data over the period 2009-2014. We find systematic underestimations of the observed uplift rates in both inverse and forward methods over specific regions of Antarctica characterized by low mantle viscosities and thin lithosphere, such as the northern Antarctic Peninsula and the Amundsen Sea Embayment, where its recent ice discharge history is likely to be playing a role in current GIA. Uplift estimates for regions where many GIA models have traditionally placed their uplift maxima, such as the margins of Filchner-Ronne and Ross ice shelves, are found to be overestimated. GIA estimates show large variability over the interior of East Antarctica which results in increased uncertainties on the ice-sheet mass balance derived from gravimetry methods. Article in Journal/Newspaper Amundsen Sea Antarc* Antarctic Antarctic Peninsula Antarctica East Antarctica Ice Sheet Ice Shelves Newcastle University Library ePrints Service Amundsen Sea Antarctic Antarctic Peninsula East Antarctica |
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Newcastle University Library ePrints Service |
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description |
In this work we assess the most recent estimates of glacial isostatic adjustment (GIA) for Antarctica, including those from both forward and inverse methods. The assessment is based on a comparison of the estimated uplift rates with a set of elastic-corrected GPS vertical velocities. These have been observed from an extensive GPS network and computed using data over the period 2009-2014. We find systematic underestimations of the observed uplift rates in both inverse and forward methods over specific regions of Antarctica characterized by low mantle viscosities and thin lithosphere, such as the northern Antarctic Peninsula and the Amundsen Sea Embayment, where its recent ice discharge history is likely to be playing a role in current GIA. Uplift estimates for regions where many GIA models have traditionally placed their uplift maxima, such as the margins of Filchner-Ronne and Ross ice shelves, are found to be overestimated. GIA estimates show large variability over the interior of East Antarctica which results in increased uncertainties on the ice-sheet mass balance derived from gravimetry methods. |
format |
Article in Journal/Newspaper |
author |
Martín-Español A King MA Zammit-Mangion A Andrews SB Moore P Bamber JL |
spellingShingle |
Martín-Español A King MA Zammit-Mangion A Andrews SB Moore P Bamber JL An assessment of forward and inverse GIA solutions for Antarctica |
author_facet |
Martín-Español A King MA Zammit-Mangion A Andrews SB Moore P Bamber JL |
author_sort |
Martín-Español A |
title |
An assessment of forward and inverse GIA solutions for Antarctica |
title_short |
An assessment of forward and inverse GIA solutions for Antarctica |
title_full |
An assessment of forward and inverse GIA solutions for Antarctica |
title_fullStr |
An assessment of forward and inverse GIA solutions for Antarctica |
title_full_unstemmed |
An assessment of forward and inverse GIA solutions for Antarctica |
title_sort |
assessment of forward and inverse gia solutions for antarctica |
publisher |
Wiley-Blackwell |
url |
https://eprint.ncl.ac.uk/fulltext.aspx?url=229681/A817CBDC-1530-4E35-863F-FD290895DE6E.pdf&pub_id=229681 |
geographic |
Amundsen Sea Antarctic Antarctic Peninsula East Antarctica |
geographic_facet |
Amundsen Sea Antarctic Antarctic Peninsula East Antarctica |
genre |
Amundsen Sea Antarc* Antarctic Antarctic Peninsula Antarctica East Antarctica Ice Sheet Ice Shelves |
genre_facet |
Amundsen Sea Antarc* Antarctic Antarctic Peninsula Antarctica East Antarctica Ice Sheet Ice Shelves |
op_source |
Journal of Geophysical Research: Solid Earth |
_version_ |
1766377193354559488 |