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An assessment of forward and inverse GIA solutions for Antarctica


Martin-Espanol, A and King, MA and Zammit-Mangion, A and Andrews, SB and Moore, P and Bamber, JL, An assessment of forward and inverse GIA solutions for Antarctica, Journal of Geophysical Research: Solid Earth, 121, (9) pp. 6947-6965. ISSN 2169-9313 (2016) [Refereed Article]

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Copyright 2016 American Geophysical Union Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0)

DOI: doi:10.1002/2016JB013154


In this work we assess the most recent estimates of glacio isostatic adjustment (GIA) for Antarctica, including those from both forward and inverse methods. The assessment is based on a comparison of the estimated uplift rates with a set of elastic-corrected GPS vertical velocities. These have been observed from an extensive GPS network and computed using data over the period 2009-2014. We find systematic underestimations of the observed uplift rates in both inverse and forward methods over specific regions of Antarctica characterized by low mantle viscosities and thin lithosphere, such as the northern Antarctic Peninsula and the Amundsen Sea Embayment, where its recent ice discharge history is likely to be playing a role in current GIA. Uplift estimates for regions where many GIA models have traditionally placed their uplift maxima, such as the margins of Filchner-Ronne and Ross ice shelves are found to be overestimated. GIA estimates show large variability over the interior of East Antarctica which results in increased uncertainties on the ice-sheet mass balance derived from gravimetry methods.

Item Details

Item Type:Refereed Article
Keywords:glacial isostatic adjustment, Antarctica
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:King, MA (Professor Matt King)
ID Code:111505
Year Published:2016
Funding Support:Australian Research Council (FT110100207)
Web of Science® Times Cited:35
Deposited By:Geography and Spatial Science
Deposited On:2016-09-19
Last Modified:2018-04-05
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