GRACE Gravity Data Constrain Ancient Ice Geometries and Continental Dynamics over Laurentia-Reference-Cited by-同舟云学术

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

Published:2007-05-11 Issue:5826 Volume:316 Page:881-883
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Tamisiea M. E.¹²,Mitrovica J. X.¹²,Davis J. L.¹²

Affiliation:

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.

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

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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