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GRACE Gravity Data Constrain Ancient Ice Geometries and Continental Dynamics over Laurentia

Tamisiea, M.E.; Mitrovica, J.X.; Davis, J.L.. 2007 GRACE Gravity Data Constrain Ancient Ice Geometries and Continental Dynamics over Laurentia. Science, 316 (5826). 881-883. 10.1126/science.1137157

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Abstract/Summary

The 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 ∼25 to ∼45% to the observed static gravity field, which represents an important boundary condition on the buoyancy of the continental tectosphere.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1126/science.1137157
Programmes: POL Programmes
ISSN: 0036-8075
NORA Subject Terms: Marine Sciences
Date made live: 30 Aug 2012 13:56
URI: http://nora.nerc.ac.uk/id/eprint/19432

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