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


Thomas, ID and King, MA and Bentley, MJ and Whitehouse, PL and Penna, NT and Williams, SDP and Riva, REM and Lavallee, DA and Clarke, PJ and King, EC and Hindmarsh, RCA and Koivula, H, Widespread low rates of Antarctic glacial isostatic adjustment revealed by GPS observations, Geophysical Research Letters, 38, (22) Article L22302. ISSN 0094-8276 (2011) [Refereed Article]

Copyright Statement

Copyright 2011 American Geophysical Union

DOI: doi:10.1029/2011GL049277


Bedrock uplift in Antarctica is dominated by a combination of glacial isostatic adjustment (GIA) and elastic response to contemporary mass change. Here, we present spatially extensive GPS observations of Antarctic bedrock uplift, using 52% more stations than previous studies, giving enhanced coverage, and with improved precision. We observe rapid elastic uplift in the northern Antarctic Peninsula. After considering elastic rebound, the GPS data suggests that modeled or empirical GIA uplift signals are often over‐estimated, particularly the magnitudes of the signal maxima. Our observation that GIA uplift is misrepresented by modeling (weighted root‐mean-squares of observation‐model differences: 4.95.0 mm/yr) suggests that, apart from a few regions where large ice mass loss is occurring, the spatial pattern of secular ice mass change derived from Gravity Recovery and Climate Experiment (GRACE) data and GIA models may be unreliable, and that several recent secular Antarctic ice mass loss estimates are systematically biased, mainly too high.

Item Details

Item Type:Refereed Article
Keywords:glacial isostatic adjustment
Research Division:Earth Sciences
Research Group:Geophysics
Research Field:Geodesy
Objective Division:Environmental Policy, Climate Change and Natural Hazards
Objective Group:Understanding climate change
Objective Field:Understanding climate change not elsewhere classified
UTAS Author:King, MA (Professor Matt King)
ID Code:89658
Year Published:2011
Web of Science® Times Cited:86
Deposited By:Geography and Environmental Studies
Deposited On:2014-03-11
Last Modified:2014-10-16

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