Computer Science
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993lpi....24..409d&link_type=abstract
In its Twenty-fourth Lunar and Planetary Science Conference. Part 1: A-F p 409-410 (SEE N94-12015 01-91)
Computer Science
Boundaries, Convective Heat Transfer, Earth Core, Earth Mantle, Heat Flux, Temperature Distribution, Temperature Gradients, Thermal Conductivity, Earth Planetary Structure, Magnetic Fields, Navier-Stokes Equation, Tomography, Wind Profiles
Scientific paper
Temperature distribution in the Earth core determines many important processes such as the following: convective motion, magnetic field generation, matter exchange between the core and the mantle, and the thermal flux. This distribution depends on conditions in the core-mantle boundary and on the distribution of the thermal conductivity in the mantle. Seismic tomography shows that large horizontal temperature and compositional gradients exists at the core-mantle boundary. The simple assumption that these inhomogeneities are extended into the top of the core contradicts the common opinion that the horizontal temperature gradient (the thermal wind) wipes them out in a short time. However, this conclusion has been obtained without taking into account that the core volume is closed and the motion, if it is started, can lead to a small redistribution of composition that stops this motion.
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