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Upper mantle viscosity underneath northern Marguerite Bay, Antarctic Peninsula constrained by bedrock uplift and ice mass variability

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Samrat, NH, King, MA ORCID: 0000-0001-5611-9498, Watson, C ORCID: 0000-0002-7464-4592, Hay, A, Barletta, VR and Bordoni, A 2021 , 'Upper mantle viscosity underneath northern Marguerite Bay, Antarctic Peninsula constrained by bedrock uplift and ice mass variability' , Geophysical Research Letters, vol. 48, no. 24 , doi: 10.1029/2021GL097065.

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Abstract

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 ∼−0.8–1.8 mm/year over 1999–2005 and 2016–2020 but ∼3.5–6.0 mm/year over ∼2005–2016. 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 ∼10–95 km and ∼0.1−9 × 1018 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.

Item Type: Article
Authors/Creators:Samrat, NH and King, MA and Watson, C and Hay, A and Barletta, VR and Bordoni, A
Keywords: glacial isostatic adjustment, GPS, viscoelastic deformation, surface mass loading
Journal or Publication Title: Geophysical Research Letters
Publisher: Wiley-Blackwell Publishing, Inc.
ISSN: 1944-8007
DOI / ID Number: 10.1029/2021GL097065
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© 2021. American Geophysical Union. All Rights Reserved.

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