Upper mantle viscosity underneath northern Marguerite Bay, Antarctic Peninsula constrained by bedrock uplift and ice mass variability
We constrain viscoelastic Earth rheology and recent ice-mass change in the northern Marguerite Bay region of the Antarctic Peninsula. Global Positioning System (GPS) time series from Rothera and San Martin stations show bedrock uplift range of∼−0.81.8mm/year over 19992005 and 20162020 but ∼3.56.0mm/...
Published in: | Geophysical Research Letters |
---|---|
Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley-Blackwell Publishing, Inc.
2021
|
Subjects: | |
Online Access: | https://doi.org/10.1029/2021GL097065 http://ecite.utas.edu.au/148439 |
id |
ftunivtasecite:oai:ecite.utas.edu.au:148439 |
---|---|
record_format |
openpolar |
spelling |
ftunivtasecite:oai:ecite.utas.edu.au:148439 2023-05-15T13:59:47+02:00 Upper mantle viscosity underneath northern Marguerite Bay, Antarctic Peninsula constrained by bedrock uplift and ice mass variability Samrat, NH King, MA Watson, C Hay, A Barletta, VR Bordoni, A 2021 https://doi.org/10.1029/2021GL097065 http://ecite.utas.edu.au/148439 en eng Wiley-Blackwell Publishing, Inc. http://dx.doi.org/10.1029/2021GL097065 http://purl.org/au-research/grants/arc/FT110100207 Samrat, NH and King, MA and Watson, C and Hay, A and Barletta, VR and Bordoni, A, Upper mantle viscosity underneath northern Marguerite Bay, Antarctic Peninsula constrained by bedrock uplift and ice mass variability, Geophysical Research Letters, 48, (24) Article e2021GL097065. ISSN 1944-8007 (2021) [Refereed Article] http://ecite.utas.edu.au/148439 Earth Sciences Geophysics Geodesy Refereed Article PeerReviewed 2021 ftunivtasecite https://doi.org/10.1029/2021GL097065 2022-04-11T22:16:43Z We constrain viscoelastic Earth rheology and recent ice-mass change in the northern Marguerite Bay region of the Antarctic Peninsula. Global Positioning System (GPS) time series from Rothera and San Martin stations show bedrock uplift range of∼−0.81.8mm/year over 19992005 and 20162020 but ∼3.56.0mm/year over ∼20052016. Digital elevation models reveal substantial surface lowering, but at a lower rate since ∼2009. Using these data, we show that an elastic-only model cannot explain the non-linear uplift of the GPS sites but that a layered viscoelastic model can. We show close agreement between GPS uplift changes and viscoelastic models with effective elastic lithosphere thickness and upper-mantle viscosity ∼1095km and ∼0.1−910 18 Pa s, respectively. Our viscosity estimate is consistent with a north-south gradient in viscosity suggested by previous studies focused on specific regions within the Antarctic Peninsula and adds further evidence of the low viscosity upper mantle in the northern Antarctic Peninsula. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula eCite UTAS (University of Tasmania) Antarctic The Antarctic Antarctic Peninsula Marguerite ENVELOPE(141.378,141.378,-66.787,-66.787) Rothera ENVELOPE(-68.130,-68.130,-67.568,-67.568) Marguerite Bay ENVELOPE(-68.000,-68.000,-68.500,-68.500) Geophysical Research Letters 48 24 |
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 Samrat, NH King, MA Watson, C Hay, A Barletta, VR Bordoni, A Upper mantle viscosity underneath northern Marguerite Bay, Antarctic Peninsula constrained by bedrock uplift and ice mass variability |
topic_facet |
Earth Sciences Geophysics Geodesy |
description |
We constrain viscoelastic Earth rheology and recent ice-mass change in the northern Marguerite Bay region of the Antarctic Peninsula. Global Positioning System (GPS) time series from Rothera and San Martin stations show bedrock uplift range of∼−0.81.8mm/year over 19992005 and 20162020 but ∼3.56.0mm/year over ∼20052016. Digital elevation models reveal substantial surface lowering, but at a lower rate since ∼2009. Using these data, we show that an elastic-only model cannot explain the non-linear uplift of the GPS sites but that a layered viscoelastic model can. We show close agreement between GPS uplift changes and viscoelastic models with effective elastic lithosphere thickness and upper-mantle viscosity ∼1095km and ∼0.1−910 18 Pa s, respectively. Our viscosity estimate is consistent with a north-south gradient in viscosity suggested by previous studies focused on specific regions within the Antarctic Peninsula and adds further evidence of the low viscosity upper mantle in the northern Antarctic Peninsula. |
format |
Article in Journal/Newspaper |
author |
Samrat, NH King, MA Watson, C Hay, A Barletta, VR Bordoni, A |
author_facet |
Samrat, NH King, MA Watson, C Hay, A Barletta, VR Bordoni, A |
author_sort |
Samrat, NH |
title |
Upper mantle viscosity underneath northern Marguerite Bay, Antarctic Peninsula constrained by bedrock uplift and ice mass variability |
title_short |
Upper mantle viscosity underneath northern Marguerite Bay, Antarctic Peninsula constrained by bedrock uplift and ice mass variability |
title_full |
Upper mantle viscosity underneath northern Marguerite Bay, Antarctic Peninsula constrained by bedrock uplift and ice mass variability |
title_fullStr |
Upper mantle viscosity underneath northern Marguerite Bay, Antarctic Peninsula constrained by bedrock uplift and ice mass variability |
title_full_unstemmed |
Upper mantle viscosity underneath northern Marguerite Bay, Antarctic Peninsula constrained by bedrock uplift and ice mass variability |
title_sort |
upper mantle viscosity underneath northern marguerite bay, antarctic peninsula constrained by bedrock uplift and ice mass variability |
publisher |
Wiley-Blackwell Publishing, Inc. |
publishDate |
2021 |
url |
https://doi.org/10.1029/2021GL097065 http://ecite.utas.edu.au/148439 |
long_lat |
ENVELOPE(141.378,141.378,-66.787,-66.787) ENVELOPE(-68.130,-68.130,-67.568,-67.568) ENVELOPE(-68.000,-68.000,-68.500,-68.500) |
geographic |
Antarctic The Antarctic Antarctic Peninsula Marguerite Rothera Marguerite Bay |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula Marguerite Rothera Marguerite Bay |
genre |
Antarc* Antarctic Antarctic Peninsula |
genre_facet |
Antarc* Antarctic Antarctic Peninsula |
op_relation |
http://dx.doi.org/10.1029/2021GL097065 http://purl.org/au-research/grants/arc/FT110100207 Samrat, NH and King, MA and Watson, C and Hay, A and Barletta, VR and Bordoni, A, Upper mantle viscosity underneath northern Marguerite Bay, Antarctic Peninsula constrained by bedrock uplift and ice mass variability, Geophysical Research Letters, 48, (24) Article e2021GL097065. ISSN 1944-8007 (2021) [Refereed Article] http://ecite.utas.edu.au/148439 |
op_doi |
https://doi.org/10.1029/2021GL097065 |
container_title |
Geophysical Research Letters |
container_volume |
48 |
container_issue |
24 |
_version_ |
1766268584053440512 |