Physics
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18.1261h&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 18, July 1991, p. 1261-1264. Research supported by DFG and NASA.
Physics
22
Boussinesq Approximation, Earth Mantle, Free Convection, Seismology, Thermal Expansion, Prandtl Number, Rayleigh Number, Rheology, Stream Functions (Fluids), Thermal Boundary Layer
Scientific paper
The influences of depth-dependent thermal expansivity on the structure of Newtonian thermal convection and lateral thermal anomalies are studied. In an aspect-ratio ten box the effects of the depth-dependent expansivity are to produce large aspect-ratio cells with a few relatively stationary upwellings. The lateral thermal anomalies in the lower mantle are greatly diminished by depth-dependent expansivity. This together with a decrease in the temperature derivative of seismic velocities in the lower mantle would support the low level of lateral heterogeneities found in recent tomographic studies.
Hansen Ulrich
Kroening Sherri E.
Yuen David A.
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