Non linear Quasi-Geostrophic thermal convection and dynamo in a rapidly rotating sphere

Details Non linear Quasi-Geostrophic thermal convection and dynamo in a rapidly rotating sphere Non linear Quasi-Geostrophic thermal convection and dynamo in a rapidly rotating sphere

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufm.p41a..04c&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #P41A-04

Physics

Geophysics

[1510] Geomagnetism And Paleomagnetism / Dynamo: Theories And Simulations, [4490] Nonlinear Geophysics / Turbulence, [5734] Planetary Sciences: Fluid Planets / Magnetic Fields And Magnetism, [8115] Tectonophysics / Core Processes

Scientific paper

Using a combination of a quasi-geostrophic (QG) model for the velocity field and a classical spectral 3D code for the temperature field, we compute thermal convective motions in a rapidly rotating full sphere. The QG flow is computed in the equatorial plane, whereas the temperature field is calculated within the full sphere. The coupling terms are evaluated by interpolating onto the 2D (equatorial) and 3D coarse grids. Our hybrid approach allows us to compute simulations at low Ekman numbers, low Prandtl numbers and explore the strongly non-linear regime currently inaccessible with purely 3D codes. We pay particular attention to the zonal winds generated by non-linear interactions between the convection columns. Understanding these zonal winds is especially relevant for the study of atmospheric layers of planets such as Jupiter and Saturn [1] and dynamo generation in convective dynamos. Moreover the 2D/3D approach has already been used successfully to obtain dynamos driven by a QG flow with a mechanical boundary forcing [2]. Following these ideas, we solve the magnetic induction equation in 3D to obtain dynamos for low Ekman, Prandtl and magnetic Prandtl numbers. [1] Heimpel, M.H., Aurnou, J.M., Wicht, J., 2005. Simulation of equatorial and high-latitude jets on Jupiter in a deep convection model. Nature 438, 193-196. [2] Schaeffer, N. and Cardin, P., 2006. Quasi-geostrophic kinematic dynamos at low magnetic Prandtl number. Earth Planet. Sci. Lett., 245, 595-604.

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