Multiple jets and zonal flow on Jupiter

Computer Science

Scientific paper

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Scientific paper

We investigate the occurrence of multiple jet zonal flows in the 2D rotating annulus model, extended to include the possibility of boundary friction. We consider Rayleigh numbers up to 10 times critical. Without boundary friction the majority of our solutions are single-jet zonal flows, that is the mean flow vorticity has one sign. However, a few examples of multiple jet solutions with stress-free boundaries have been found. When boundary friction is present, persistent multiple jet solutions are found much more easily. Compared to the stress-free case, the number of jets increases, though the strength of the zonal flow decreases. The dependence of these features on Ekman and Rayleigh number is discussed, suggesting that at values well beyond the reach of present 3D simulations, solutions resembling the observed jovian zonal flow may exist. The boundary condition at the metallic/insulating hydrogen interface envelope is more likely to resemble a rigid boundary than a stress-free boundary. This indicates that modelling this interface region realistically will be an important part of any explanation of the occurrence of multiple jets on the planet Jupiter.

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