Effects of the core cooling on the internal dynamics and thermal evolution of terrestrial planets

Details Effects of the core cooling on the internal dynamics and thermal evolution of terrestrial planets Effects of the core cooling on the internal dynamics and thermal evolution of terrestrial planets

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....9912109a&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. B6, p. 12,109-12,119

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3

Core-Mantle Boundary, Heating, Planetary Cores, Terrestrial Planets, Thermodynamics, Three Dimensional Models, Viscosity, Convection, Cooling, Heat Transfer, Pressure Dependence, Temperature Distribution, Time Dependence

Scientific paper

The effects of thermal coupling of the core and mantle on the thermal evolution and mantle dynamics of terrestrial planets are investigated using three-dimensional models in a spherical shell. Three pairs of models are presented to study mantle models of viscosities and internal heating. In each pair, one model adopts a constnat temperature at the core-mantle boundary, and the other allows the core to thermally couple to the mantle and cool. In the first and second pairs, the mantle is heated only from below, whereas in the third pari, internal heating is due to radioactive elements. The mantle viscosity of the first and third pairs is 10(exp 21) Pa s, while the mantle of the second pair has a viscosity of 10(exp 22) Pa s. The thermal coupling of the core and mantle has strong effects on the thermal boundary layer near the core-mantle boundary, and thus reduces the vigor of convection in the mantle. The models with cooling cores result in a substantially colder and relatively less dynamic mantle than the models with a fixed temperature at the core-mantle boundary which overestimates temperatures in the mantle.

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