GRACE Gravity Data Constrain Ancient Ice Geometries and Continental Dynamics over Laurentia
M. E. Tamisiea,1*
J. X. Mitrovica,2
J. L. Davis1
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.
1 Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Mail Stop 42, Cambridge, MA 02143, USA.
2 Department of Physics, University of Toronto, 60 St. George Street, Toronto, ON M5S 1A7, Canada.
* Present address: Proudman Oceanographic Laboratory, 6 Brownlow Street, Liverpool L3 5DA, UK.
To whom correspondence should be addressed. E-mail: mtamisiea{at}cfa.harvard.edu
