Mathematics – Logic
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufm.p21c1678v&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #P21C-1678
Mathematics
Logic
[5400] Planetary Sciences: Solid Surface Planets, [5418] Planetary Sciences: Solid Surface Planets / Heat Flow, [5430] Planetary Sciences: Solid Surface Planets / Interiors
Scientific paper
Superearth exoplanets in the range of one to ten times the Earth's mass may have a much extended pressure regime compared to Earth, up to about 1 TPa, that may give rise to different material behavior controling planetary evolution. These points concern the mantle rheology where pressure affects both deep mantle viscosity and the brittle-ductile transition, both with a direct impact on lithosphere dynamics and the heat transport capacity of superearth mantle convection. Besides rheological considirations, other properties also show strong variation with pressure such as behavior of thermophysical properties, in particular ,thermal expansivity and thermal conductivity, At ultra-high pressure they will exert a strong impact on the effectiveness of convective heat transport. We present results of convection modelling experiments exploring the forementioned model sensitivities on mantle heat transport expressed in terms of Nusselt-Rayleigh number relationships. We use a compressible convection model based on the anelastic liquid approximation and apply a selfconsistent model for the thermophysical properties based on ab-initio and lattice dynamics for relevant mantle silicates, perovskite, post-perovskite and periclase with all of the attendant phase transitions. In view of the high value of the surface dissipation number, typically Di ~ 5, this provides a significant improvement compared to conventional (extended) Boussinesq models. We show that deep mantle rheology parameterized through an activation volume of the dominant creep mechanism as well as a pseudo-brittle lid controlling stagnant behavior are the main factors determining the thermal state.
Jacobs Matthew
Thio V.
Umemoto Koichiro
van den Berg Arie P.
Wentzcovitch Renata M.
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