Numerical simulations of thermal-chemical instabilities at the core-mantle boundary

Details Numerical simulations of thermal-chemical instabilities at the core-mantle boundary Numerical simulations of thermal-chemical instabilities at the core-mantle boundary

Jul 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988natur.334..237h&link_type=abstract

Nature (ISSN 0028-0836), vol. 334, July 21, 1988, p. 237-240. NSF-NASA-DFG-supported research.

Computer Science

57

Computerized Simulation, Earth Core, Earth Mantle, Geochemistry, Thermal Instability, Free Convection, Geodynamics, Geotemperature

Scientific paper

Numerical simulations of thermal-chemical instabilities in the D-double-prime layer at the core-mantle boundary are presented which show that strong lateral heterogeneities in the composition and density fields can be initiated and maintained dynamically if there is continuous replenishment of material from subduced slabs coming from the upper mantle. These chemical instabilities have a tendency to migrate laterally and may help to support core-mantle boundary topography with short and long wavelengths. The thermal-chemical flows produce a relatively stagnant D-double-prime layer with strong lateral and temporal variations in basal heat flux, which gives rise to thermal core-mantle interactions influencing the geodynamo.

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