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Incomplete separability of Antarctic plate rotation from glacial isostatic adjustment deformation within geodetic observations

Citation

King, MA and Whitehouse, PL and van der Wal, W, Incomplete separability of Antarctic plate rotation from glacial isostatic adjustment deformation within geodetic observations, Geophysical Journal International, 204, (1) pp. 324-330. ISSN 0956-540X (2016) [Refereed Article]


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Copyright Statement

Copyright 2015 The Authors Licenced under Creative Commons Attribution 4.0 International (CC BY 4.0) http://creativecommons.org/licenses/by/4.0/

DOI: doi:10.1093/gji/ggv461

Abstract

Geodetic measurements of Antarctic solid Earth deformation include signals from plate rotation and glacial isostatic adjustment (GIA). Through simulation, we investigate the degree to which these signals are separable within horizontal GPS site velocities that commonly define plate rotation estimates and that promise new constraints on models of GIA. Using a suite of GIA model predictions that incorporate both 1-D and 3-D Earth rheologies, we show that, given the present location of GPS sites within East Antarctica, unmodelled or mismodelled GIA signal within GPS velocities produces biased estimates of plate rotation. When biased plate rotation is removed from the GPS velocities, errors as large as 0.8 mm yr−1 are introduced; a value commonly larger than the predicted GIA signal magnitude. In the absence of reliable forward models of plate rotation or GIA then Antarctic geodetic velocities cannot totally and unambiguously constrain either process, especially GIA.

Item Details

Item Type:Refereed Article
Keywords:plate rotation, glacial isostatic adjustment, GPS, geodesy, space geodetic surveys, plate motions, tectonics and climatic interactions, Antarctica
Research Division:Engineering
Research Group:Geomatic Engineering
Research Field:Geodesy
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Earth Sciences
Author:King, MA (Professor Matt King)
ID Code:104895
Year Published:2016
Funding Support:Australian Research Council (FT110100207)
Web of Science® Times Cited:7
Deposited By:Geography and Spatial Science
Deposited On:2015-11-25
Last Modified:2017-10-24
Downloads:128 View Download Statistics

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