Mantle convection with internal heating and pressure-dependent thermal expansivity

Details Mantle convection with internal heating and pressure-dependent thermal expansivity Mantle convection with internal heating and pressure-dependent thermal expansivity

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991e%26psl.102..213l&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 102, no. 2, Feb. 1991, p. 213-232. NASA-supported research.

Computer Science

30

Convection, Earth Mantle, Plumes, Pressure Dependence, Thermal Expansion, Conductive Heat Transfer, Heating, Seismology, Temperature Distribution, Thermal Conductivity

Scientific paper

Recent laboratory work suggests that the thermal expansivity alpha of the mantle decreases strongly with pressure. alpha determines the buoyancy of plumes and the rate at which plumes lose their thermal signature as they rise, and so may be expected to have a strong influence on the temperature and velocity structure of the mantle. Numerical simulations were conducted on convection in an internally heated, compressible mantle including constant and pressure-dependent alpha and thermal conductivity kappa. They show that a pressure-dependent alpha allows the existence of thermal plumes rising from the core-mantle boundary, however the plumes are weak and dissipate higher in the mantle.

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