Other
Scientific paper
Jun 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985georl..12..357l&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 12, June 1985, p. 357-360.
Other
2
Convection, Earth Gravitation, Earth Mantle, Geophysical Fluids, Gravity Anomalies, Pacific Ocean, Topography, Viscous Fluids, Boussinesq Approximation, Finite Difference Theory, Heat Flux, Rayleigh Number, Temperature Dependence
Scientific paper
Finite difference calculations of thermal convection in a fluid layer with a viscosity exponentially decreasing with temperature are performed in the context of examining the topography and gravity anomalies due to mantle convection. The surface topography and gravity anomalies are shown to be positive over regions of ascending flow and negative over regions of descending flow; at large Rayleigh numbers the amplitude of surface topography is inferred to depend on Rayleigh number to the power of 7/9. Compositional stratifications of the mantle is proposed as a mechanism for confining small-scale convection to a thin layer. A comparative analysis of the results with other available models is included.
Lin Juhn-Jong
Parmentier Marc E.
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