Physics
Scientific paper
Oct 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19.1995c&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 20, p. 1995-1998.
Physics
23
Convection, Earth Core, Rotating Spheres, Thermochemical Properties, Buoyancy, Structural Properties (Geology)
Scientific paper
Preliminary experiments on the structure of thermochemical convection in a rotating sphere with the geometry of the earth's core are reported. Fully developed thermochemical convection in a rapidly rotating sphere is driven by buoyant ribbon-shaped plumes concentrated in the equatorial region. Curtains of fluid aligned parallel to the rotation axis and extending across the sphere move with the plumes. The motion is turbulent in planes parallel to the equator. The convection generates a secondary, large-scale zonal flow which is primarily retrograde. The main difference between chemically dominated and thermally dominated convection is the smaller scales of motion present when compositional buoyancy drives the flow. In cases when both are present simultaneously, the structure of the motion is found to be similar to purely thermal convection.
Cardin Philippe
Olson Peter
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