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Present-day Antarctic ice mass changes and crustal motionThe peak vertical velocities predicted by three realistic, but contrasting, present-day scenarios of Antarctic ice sheet mass balance are found to be of the order of several mm/a. One scenario predicts local uplift rates in excess of 5 mm/a. These rates are small compared to the peak Antarctic vertical velocities of the ICE-3G glacial rebound model, which are in excess of 20 mm/a. If the Holocene Antarctic deglaciation history protrayed in ICE-3G is realistic, and if regional upper mantle viscosity is not an order of magnitude below 10(exp 21) Pa(dot)s, then a vast geographical region in West Antarctica is uplifting at a rate that could be detected by a future Global Positioning System (GPS) campaign. While present-day scenarios predict small vertical crustal velocities, their overall continent-ocean mass exchange is large enough to account for a substantial portion of the observed secular polar motion (omega m(arrow dot)) and time-varying zonal gravity field.
Document ID
19950053174
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
James, Thomas S.
(Geological Survey of Canada Canada)
Ivins, Erik R.
(University of Southern California CA, United States)
Date Acquired
August 16, 2013
Publication Date
April 15, 1995
Publication Information
Publication: Geophysical Research Letters
Volume: 22
Issue: 8
ISSN: 0094-8276
Subject Category
Geophysics
Accession Number
95A84773
Funding Number(s)
CONTRACT_GRANT: NAG5-1940
Distribution Limits
Public
Copyright
Other

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