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 (∼77-120E) where models of glacial isostatic adjustment (GIA) disagree, glaciers are likely losing mass, and few data constraints on GIA exist. We show that varying su...
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Amer Geophysical Union
2022
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Online Access: | https://doi.org/10.1029/2021GL097232 http://ecite.utas.edu.au/148850 |
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ftunivtasecite:oai:ecite.utas.edu.au:148850 2023-05-15T13:59:46+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://doi.org/10.1029/2021GL097232 http://ecite.utas.edu.au/148850 en eng Amer Geophysical Union http://ecite.utas.edu.au/148850/1/148850 - GPS rates of vertical bedrock motion suggest late Holocene ice-sheet readvance in a critical sector of East Antarctica.pdf http://dx.doi.org/10.1029/2021GL097232 King, MA and Watson, CS and White, D, GPS rates of vertical bedrock motion suggest late Holocene ice-sheet readvance in a critical sector of East Antarctica, Geophysical Research Letters Article e2021GL097232. ISSN 0094-8276 (2022) [Refereed Article] http://ecite.utas.edu.au/148850 Earth Sciences Geophysics Geodesy Refereed Article PeerReviewed 2022 ftunivtasecite https://doi.org/10.1029/2021GL097232 2022-03-07T23:16:46Z We investigate present-day bedrock vertical motion using new GPS timeseries from the Totten-Denman glacier region of East Antarctica (∼77-120E) 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 regions 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 eCite UTAS (University of Tasmania) Denman Glacier ENVELOPE(99.417,99.417,-66.750,-66.750) East Antarctica Totten Glacier ENVELOPE(116.333,116.333,-66.833,-66.833) Geophysical Research Letters 49 4 |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Geophysics Geodesy |
spellingShingle |
Earth Sciences Geophysics Geodesy 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 |
Earth Sciences Geophysics Geodesy |
description |
We investigate present-day bedrock vertical motion using new GPS timeseries from the Totten-Denman glacier region of East Antarctica (∼77-120E) 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 regions 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://doi.org/10.1029/2021GL097232 http://ecite.utas.edu.au/148850 |
long_lat |
ENVELOPE(99.417,99.417,-66.750,-66.750) ENVELOPE(116.333,116.333,-66.833,-66.833) |
geographic |
Denman Glacier East Antarctica Totten Glacier |
geographic_facet |
Denman Glacier East Antarctica Totten 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 |
http://ecite.utas.edu.au/148850/1/148850 - GPS rates of vertical bedrock motion suggest late Holocene ice-sheet readvance in a critical sector of East Antarctica.pdf http://dx.doi.org/10.1029/2021GL097232 King, MA and Watson, CS and White, D, GPS rates of vertical bedrock motion suggest late Holocene ice-sheet readvance in a critical sector of East Antarctica, Geophysical Research Letters Article e2021GL097232. ISSN 0094-8276 (2022) [Refereed Article] http://ecite.utas.edu.au/148850 |
op_doi |
https://doi.org/10.1029/2021GL097232 |
container_title |
Geophysical Research Letters |
container_volume |
49 |
container_issue |
4 |
_version_ |
1766268579170222080 |