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

Citation

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]


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© 2021. American Geophysical Union. All Rights Reserved.

DOI: doi:10.1029/2021GL097065

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 Details

Item Type:Refereed Article
Keywords:glacial isostatic adjustment, GPS, viscoelastic deformation, surface mass loading
Research Division:Earth Sciences
Research Group:Geophysics
Research Field:Geodesy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the earth sciences
UTAS Author:Samrat, NH (Mr Nahidul Samrat)
UTAS Author:King, MA (Professor Matt King)
UTAS Author:Watson, C (Dr Christopher Watson)
UTAS Author:Hay, A (Mrs Andrea Hay)
ID Code:148439
Year Published:2021
Funding Support:Australian Research Council (FT110100207)
Web of Science® Times Cited:1
Deposited By:Geography and Spatial Science
Deposited On:2022-01-10
Last Modified:2022-04-07
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