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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/
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: | 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: | 104895 |
| Year Published: | 2016 |
| Funding Support: | Australian Research Council (FT110100207) |
| Web of Science® Times Cited: | 18 |
| Deposited By: | Geography and Spatial Science |
| Deposited On: | 2015-11-25 |
| Last Modified: | 2017-10-24 |
| Downloads: | 256 View Download Statistics |
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