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GRACE Gravity Data Constrain Ancient Ice Geometries and Continental Dynamics over LaurentiaThe free-air gravity trend over Canada, derived from the Gravity Recovery and Climate Experiment (GRACE) satellite mission, robustly isolates the gravity signal associated with glacial isostatic adjustment (GIA) from the longer-time scale mantle convection process. This trend proves that the ancient Laurentian ice complex was composed of two large domes to the west and east of Hudson Bay, in accord with one of two classes of earlier reconstructions. Moreover, GIA models that reconcile the peak rates contribute approximately 25 to approximately 45% to the observed static gravity field, which represents an important boundary condition on the buoyancy of the continental tectosphere.
Document ID
20080034472
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Tamisiea, M. E.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Mitrovica, J. X.
(Toronto Univ. Ontario, Canada)
Davis, J. L.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Date Acquired
August 24, 2013
Publication Date
May 11, 2007
Publication Information
Publication: Science
Publisher: American Association for the Advancement of Science
Volume: 316
Issue: 5826
Subject Category
Meteorology And Climatology
Funding Number(s)
CONTRACT_GRANT: NNG04GF09G
Distribution Limits
Public
Copyright
Other

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