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

被引：131

作者：

Tamisiea, M. E.

Mitrovica, J. X.

Davis, J. L.

机构：

[1] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02143 USA

[2] Univ Toronto, Dept Phys, Toronto, ON M5S 1A7, Canada

来源：

SCIENCE | 2007年 / 316卷 / 5826期

关键词：

D O I：

10.1126/science.1137157

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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

引用

页码：881 / 883

页数：3

共 24 条

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