Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufm.p41c1286e&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #P41C-1286
Physics
5700 Planetary Sciences: Fluid Planets, 5704 Atmospheres (0343, 1060), 5724 Interiors (8147)
Scientific paper
Three-dimensional numerical simulations of thermal convection in fully convective, non-magnetic, rotating, density-stratified spherical fluid bodies are presented. We observe the development of discontinuous axially aligned flow structures that spiral positive momentum away from the axis of rotation. The convergence of the nonlinear Reynolds stresses results from the vorticity generated by fluid flowing through the density stratification. This mechanism maintains differential rotation with a strong prograde jet at the equator without the classical vortex stretching of Taylor columns. Moreover the flow structures, despite being discontinuous, preferentially transport heat axially from the interior of the planet. This results in a greater heat flux at high latitudes than near the equator. Coupled with the known pattern of solar irradiation this could explain the nearly uniform latitudinal emission of energy from Jupiter without evoking pole-ward atmospheric winds perpendicular to the observed zonal wind structure.
Evonuk Martha
Glatzmaier G.
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