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An assessment of forward and inverse GIA solutions for Antarctica

Lookup NU author(s): Professor Matthew King, Stuart Andrews, Professor Philip Moore

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


Abstract

In this work we assess the most recent estimates of glacial 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.


Publication metadata

Author(s): Martín-Español A, King MA, Zammit-Mangion A, Andrews SB, Moore P, Bamber JL

Publication type: Article

Publication status: Published

Journal: Journal of Geophysical Research: Solid Earth

Year: 2016

Volume: 121

Issue: 9

Pages: 6947-6965

Print publication date: 01/09/2016

Online publication date: 16/09/2016

Acceptance date: 08/09/2016

Date deposited: 07/12/2016

ISSN (print): 2169-9313

ISSN (electronic): 2169-9356

Publisher: Wiley-Blackwell

URL: http://dx.doi.org/10.1002/2016JB013154

DOI: 10.1002/2016JB013154


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