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Link to original content: http://www.ncbi.nlm.nih.gov/pubmed/17495169
GRACE gravity data constrain ancient ice geometries and continental dynamics over Laurentia - PubMed Skip to main page content
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. 2007 May 11;316(5826):881-3.
doi: 10.1126/science.1137157.

GRACE gravity data constrain ancient ice geometries and continental dynamics over Laurentia

M E Tamisiea  1 , J X Mitrovica, J L Davis
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GRACE gravity data constrain ancient ice geometries and continental dynamics over Laurentia

M E Tamisiea et al. Science. .

Abstract

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

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