GPS rates of vertical bedrock motion suggest late Holocene ice-sheet readvance in a critical sector of East Antarctica
We investigate present-day bedrock vertical motion using new GPS timeseries from the Totten-Denman glacier region of East Antarctica (∼77-120°E) where models of glacial isostatic adjustment (GIA) disagree, glaciers are likely losing mass, and few data constraints on GIA exist. We show that varying s...
Published in: | Geophysical Research Letters |
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Language: | English |
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Amer Geophysical Union
2022
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Online Access: | https://eprints.utas.edu.au/45589/ https://eprints.utas.edu.au/45589/1/148850%20-%20GPS%20rates%20of%20vertical%20bedrock%20motion%20suggest%20late%20Holocene%20ice-sheet%20readvance%20in%20a%20critical%20sector%20of%20East%20Antarctica.pdf |
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ftunivtasmania:oai:eprints.utas.edu.au:45589 2023-05-15T13:41:50+02:00 GPS rates of vertical bedrock motion suggest late Holocene ice-sheet readvance in a critical sector of East Antarctica King, MA Watson, CS White, D 2022 application/pdf https://eprints.utas.edu.au/45589/ https://eprints.utas.edu.au/45589/1/148850%20-%20GPS%20rates%20of%20vertical%20bedrock%20motion%20suggest%20late%20Holocene%20ice-sheet%20readvance%20in%20a%20critical%20sector%20of%20East%20Antarctica.pdf en eng Amer Geophysical Union https://eprints.utas.edu.au/45589/1/148850%20-%20GPS%20rates%20of%20vertical%20bedrock%20motion%20suggest%20late%20Holocene%20ice-sheet%20readvance%20in%20a%20critical%20sector%20of%20East%20Antarctica.pdf King, MA orcid:0000-0001-5611-9498 , Watson, CS orcid:0000-0002-7464-4592 and White, D 2022 , 'GPS rates of vertical bedrock motion suggest late Holocene ice-sheet readvance in a critical sector of East Antarctica' , Geophysical Research Letters , doi:10.1029/2021GL097232 <http://dx.doi.org/10.1029/2021GL097232>. glacial isostatic adjustment Antarctica GPS late Holocene surface mass balance common mode error Article PeerReviewed 2022 ftunivtasmania https://doi.org/10.1029/2021GL097232 2022-04-25T22:16:42Z We investigate present-day bedrock vertical motion using new GPS timeseries from the Totten-Denman glacier region of East Antarctica (∼77-120°E) where models of glacial isostatic adjustment (GIA) disagree, glaciers are likely losing mass, and few data constraints on GIA exist. We show that varying surface mass balance loading (SMBL) is a dominant signal, contributing random-walk-like noise to GPS timeseries across Antarctica. In the study region, it induces site velocity biases of up to ∼+1 mm/yr over 2010-2020. After correcting for SMBL displacement and GPS common mode error, subsidence is evident at all sites aside from the Totten Glacier region where uplift is ∼1.5 mm/yr. Uplift near the Totten Glacier is consistent with late Holocene ice retreat while the widespread subsidence further west suggests possible late Holocene readvance of the region’s ice sheet, in broad agreement with limited glacial geological data and highlighting the need for sampling beneath the current ice sheet. Article in Journal/Newspaper Antarc* Antarctica Denman Glacier East Antarctica Ice Sheet Totten Glacier University of Tasmania: UTas ePrints East Antarctica Totten Glacier ENVELOPE(116.333,116.333,-66.833,-66.833) Denman Glacier ENVELOPE(99.417,99.417,-66.750,-66.750) Geophysical Research Letters 49 4 |
institution |
Open Polar |
collection |
University of Tasmania: UTas ePrints |
op_collection_id |
ftunivtasmania |
language |
English |
topic |
glacial isostatic adjustment Antarctica GPS late Holocene surface mass balance common mode error |
spellingShingle |
glacial isostatic adjustment Antarctica GPS late Holocene surface mass balance common mode error King, MA Watson, CS White, D GPS rates of vertical bedrock motion suggest late Holocene ice-sheet readvance in a critical sector of East Antarctica |
topic_facet |
glacial isostatic adjustment Antarctica GPS late Holocene surface mass balance common mode error |
description |
We investigate present-day bedrock vertical motion using new GPS timeseries from the Totten-Denman glacier region of East Antarctica (∼77-120°E) where models of glacial isostatic adjustment (GIA) disagree, glaciers are likely losing mass, and few data constraints on GIA exist. We show that varying surface mass balance loading (SMBL) is a dominant signal, contributing random-walk-like noise to GPS timeseries across Antarctica. In the study region, it induces site velocity biases of up to ∼+1 mm/yr over 2010-2020. After correcting for SMBL displacement and GPS common mode error, subsidence is evident at all sites aside from the Totten Glacier region where uplift is ∼1.5 mm/yr. Uplift near the Totten Glacier is consistent with late Holocene ice retreat while the widespread subsidence further west suggests possible late Holocene readvance of the region’s ice sheet, in broad agreement with limited glacial geological data and highlighting the need for sampling beneath the current ice sheet. |
format |
Article in Journal/Newspaper |
author |
King, MA Watson, CS White, D |
author_facet |
King, MA Watson, CS White, D |
author_sort |
King, MA |
title |
GPS rates of vertical bedrock motion suggest late Holocene ice-sheet readvance in a critical sector of East Antarctica |
title_short |
GPS rates of vertical bedrock motion suggest late Holocene ice-sheet readvance in a critical sector of East Antarctica |
title_full |
GPS rates of vertical bedrock motion suggest late Holocene ice-sheet readvance in a critical sector of East Antarctica |
title_fullStr |
GPS rates of vertical bedrock motion suggest late Holocene ice-sheet readvance in a critical sector of East Antarctica |
title_full_unstemmed |
GPS rates of vertical bedrock motion suggest late Holocene ice-sheet readvance in a critical sector of East Antarctica |
title_sort |
gps rates of vertical bedrock motion suggest late holocene ice-sheet readvance in a critical sector of east antarctica |
publisher |
Amer Geophysical Union |
publishDate |
2022 |
url |
https://eprints.utas.edu.au/45589/ https://eprints.utas.edu.au/45589/1/148850%20-%20GPS%20rates%20of%20vertical%20bedrock%20motion%20suggest%20late%20Holocene%20ice-sheet%20readvance%20in%20a%20critical%20sector%20of%20East%20Antarctica.pdf |
long_lat |
ENVELOPE(116.333,116.333,-66.833,-66.833) ENVELOPE(99.417,99.417,-66.750,-66.750) |
geographic |
East Antarctica Totten Glacier Denman Glacier |
geographic_facet |
East Antarctica Totten Glacier Denman Glacier |
genre |
Antarc* Antarctica Denman Glacier East Antarctica Ice Sheet Totten Glacier |
genre_facet |
Antarc* Antarctica Denman Glacier East Antarctica Ice Sheet Totten Glacier |
op_relation |
https://eprints.utas.edu.au/45589/1/148850%20-%20GPS%20rates%20of%20vertical%20bedrock%20motion%20suggest%20late%20Holocene%20ice-sheet%20readvance%20in%20a%20critical%20sector%20of%20East%20Antarctica.pdf King, MA orcid:0000-0001-5611-9498 , Watson, CS orcid:0000-0002-7464-4592 and White, D 2022 , 'GPS rates of vertical bedrock motion suggest late Holocene ice-sheet readvance in a critical sector of East Antarctica' , Geophysical Research Letters , doi:10.1029/2021GL097232 <http://dx.doi.org/10.1029/2021GL097232>. |
op_doi |
https://doi.org/10.1029/2021GL097232 |
container_title |
Geophysical Research Letters |
container_volume |
49 |
container_issue |
4 |
_version_ |
1766159066376175616 |