Physics
Scientific paper
Jun 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87.4682s&link_type=abstract
Journal of Geophysical Research, vol. 87, June 10, 1982, p. 4682-4696. Research supported by the Deutsche Forschungsgemeinschaf
Physics
94
Convective Heat Transfer, Earth Mantle, Geotemperature, Earth Core, Earth Surface, Radioactive Decay
Scientific paper
Thermal histories for two-layer and whole-mantle convection models are calculated and presented, based on a parameterization of convective heat transport. The model is composed of two concentric spherical shells surrounding a spherical core. The models were constrained to yield the observed present-day surface heat flow and mantle viscosity, in order to determine parameters. These parameters were varied to determine their effects on the results. Studies show that whole-mantle convection removes three times more primordial heat from the earth interior and six times more from the core than does two-layer convection (in 4.5 billion years). Mantle volumetric heat generation rates for both models are comparable to that of a potassium-depleted chondrite, and thus surface heat-flux balance does not require potassium in the core. Whole and two-layer mantle convection differences are primarily due to lower mantle thermal insulation and the lower heat removal efficiency of the upper mantle as compared with that of the whole mantle.
Schubert Gerald
Spohn Tilman
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