Polar motions excited by a convecting viscous mantle

Details Polar motions excited by a convecting viscous mantle Polar motions excited by a convecting viscous mantle

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19.2251m&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 22, p. 2251-2254.

Physics

8

Earth Mantle, Free Convection, Polar Wandering (Geology), Viscous Flow, Angular Momentum, Moments Of Inertia, Rheology

Scientific paper

The role played by time-dependent mantle convection on exciting long-term polar motions is examined by means of a viscous model. For sufficiently low effective viscosity, polar-wander speeds of 0(1 deg/Myr) would require contributions from the off-diagonal elements of the inertia tensor, with magnitudes around 100,000 times smaller than those found in viscoelastic models used for postglacial rebound. Contributions from the large-scale mantle flow to the angular momentum vector can be comparable to those due to changes in moment of inertia tensor for nonlinear rheology or for young planet. The relative roles of the two contributions depend on the nonlinear rheology of the mantle and its convective vigor.

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