Physics
Scientific paper
Aug 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004pepi..146..139s&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 146, Issue 1-2, p. 139-145.
Physics
2
Mantle Convection, D''-Layer, Core-Mantle Boundary
Scientific paper
We have investigated the possibilities for thermochemical convective instability of a low viscous, dense D''-layer heated from below, in either the extended Boussinesq approximation (i.e. with dissipation) or the Boussinesq approximation only. We find, that the compositional excess density in the D''-layer, required for its stratification at the core-mantle boundary is greatly overestimated in the Boussinesq approximation (Di=0, Rρ~0.8). In the extended Boussinesq approximation the stabilizing excess density is far less (Di=0.3, Rρ=0.3). Therefore, in a dissipative mantle, a strongly stratified D''-density profile is unlikely, because it would stabilize the D''-layer and inhibit the development of large mantle plumes. A too low viscosity drop, greater than 102, of the D''-layer would lead to stratification of the layer and small-scale convection taking place inside it.
Schott Bertram
Yuen Dave A.
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