Widespread low rates of Antarctic glacial isostatic adjustment revealed by GPS observations

Bedrock uplift in Antarctica is dominated by acombination of glacial isostatic adjustment (GIA) andelastic response to contemporary mass change. Here, wepresent spatially extensive GPS observations of Antarcticbedrock uplift, using 52% more stations than previousstudies, giving enhanced coverage, an...

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Bibliographic Details
Published in:Geophysical Research Letters
Main Authors: Thomas, ID, King, MA, Bentley, MJ, Whitehouse, PL, Penna, NT, Williams, SDP, Riva, REM, Lavallee, DA, Clarke, PJ, King, EC, Hindmarsh, RCA, Koivula, H
Format: Article in Journal/Newspaper
Language:English
Published: Amer Geophysical Union 2011
Subjects:
Engineering
Geomatic Engineering
Geodesy
Antarctic
Antarc*
Antarctica
Online Access:https://doi.org/10.1029/2011GL049277
http://ecite.utas.edu.au/89658
Description
Summary:Bedrock uplift in Antarctica is dominated by acombination of glacial isostatic adjustment (GIA) andelastic response to contemporary mass change. Here, wepresent spatially extensive GPS observations of Antarcticbedrock uplift, using 52% more stations than previousstudies, giving enhanced coverage, and with improvedprecision. We observe rapid elastic uplift in the northernAntarctic Peninsula. After considering elastic rebound, theGPS data suggests that modeled or empirical GIA upliftsignals are often over‐estimated, particularly themagnitudes of the signal maxima. Our observation that GIAuplift is misrepresented by modeling (weighted root‐mean-squaresof observation‐model differences: 4.95.0 mm/yr)suggests that, apart from a few regions where large icemass loss is occurring, the spatial pattern of secular icemass change derived from Gravity Recovery and ClimateExperiment (GRACE) data and GIA models may beunreliable, and that several recent secular Antarctic icemass loss estimates are systematically biased, mainly toohigh.

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