Physics
Scientific paper
Mar 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17..243t&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 17, March 1990, p. 243-246.
Physics
29
Free Convection, Heat Generation, Heat Sources, Plates (Tectonics), Finite Difference Theory, Prandtl Number, Shadowgraph Photography, Subduction (Geology), Time Dependence, Viscous Flow
Scientific paper
Thermal convection planforms in an infinite Prandtl number, isoviscous fluid layer with basal and internal heating are determined using three-dimensional finite difference calculations. With basal heating only, at Rayleigh number Ra(T) = 150,000, the planform consists of a weakly time-dependent spoke pattern, with connected networks of equally buoyant up- and down-wellings. With volumetric heat sources, the planform is strongly time variable. It consists of negatively buoyant flow concentrated in thermal trenches (discrete, arcuate sheets) and spots (cylindrical colums), separated by diffuse, nonbuoyant upwellings. Rapid planform changes occur primarily by trench propagation, as observed experimentally by Weinstein and Olson (1990). The analogy between thermal trenches in internally heated convection and convergent plate boundaries on earth suggests that the global pattern of subduction may evolve by propagation of Wadati-Benioff zones along the strike of the slab.
Olson Peter
Travis Bryan
Weinstein Stuart
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