Other
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.g42a..02p&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #G42A-02
Other
1217 Time Variable Gravity (7223, 7230), 1225 Global Change From Geodesy (1222, 1622, 1630, 1641, 1645, 4556), 1236 Rheology Of The Lithosphere And Mantle (7218, 8160), 1239 Earth Rotation Variations, 1240 Satellite Geodesy: Results (6929, 7215, 7230, 7240)
Scientific paper
Recent analyses of the time-dependent gravity field delivered by the GRACE program have clearly demonstrated the accuracy of the ICE-5G(VM2) model of the global process of glacial isostatic adjustment insofar as the observed features of the signal associated with North American deglaciation are concerned. Since the model was published prior to the availability of GRACE measurements, this has been very satisfying. There are nevertheless minor misfits that continue to exist between the predictions of the model and other related observations. One of these concerns the ability of the model to fit observations of certain anomalies associated with the planet's rotational state, namely the non-tidal acceleration of planetary rotation and the ongoing wander of the pole towards the centroid of the ancient Laurentide ice sheet. I employ the fact that the viscosity of the mantle from the surface to ~1400 km depth is "pinned" by both relative sea level and GRACE data to investigate the modifications to the viscosity structure at greater depth that are required to eliminate the remaining misfits to the rotational constraints. These analyses demonstrate that both misfits are simultaneously removed by the introduction of a low viscosity region coincident with the D" boundary- layer adjacent to the core-mantle interface. This is a highly satisfactory result as such a low viscosity region is expected on a priori grounds. The result has implications concerning the accuracy of previously published models for the viscosity of the deepest mantle and these will be discussed.
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