Convection within the inner-core and thermal implications

Details Convection within the inner-core and thermal implications Convection within the inner-core and thermal implications

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19.2107w&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 21, p. 2107-2110.

Mathematics

Logic

21

Earth Core, Free Convection, Structural Properties (Geology), Q Factors, Rayleigh Number

Scientific paper

Estimation of the Rayleigh numbers of the inner-core leads to the conclusion that, even with low internal heating rates, this region of the earth is convecting. This work presents an axisymmetrical model able to investigate convection in a sphere and its applications to the earth's inner-core. Rayleigh numbers ranging from the critical (onset of the convection) to 10,000 times the critical have been explored. The thermal implications of a convecting inner-core have been pointed out: in all the cases the temperature profiles are very close to the adiabat, leading to the possibility of a partially molten regions in the inner-core. Indeed, the most important effects appear in the first tens of kilometers, just below the inner-core surface and could be at the origin of the low quality factors Q-alpha and Q-beta revealed by seismological studies.

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