[MGI35-P03] Surface zonal flows induced by anelastic thermal convection in a rapidly rotating spherical shell
Keywords:Jovian planets, anelastic system
For this purpose, we developed and parallelized an anelastic model of thermal convection in a rotating spherical shell considering basic radial density variation. The spectral transformation library used in this model was improved to introduce MPI parallelization not only in the latitude direction but also in the radial direction. As a result, we succeeded in increasing the number of parallel processes which had been limited by the number of latitudinal grid points, and more massive parallel numerical experiments became possible.
Followup and extended numerical experiments of Case 2 in Gastine et al.(2014) were performed with the developed anelastic convection model. When the time integration is as short as viscous diffusion time, the latitudinal profile of induced surface zonal flow is consistent with that of Gastine et al. (2014). However, when time integration is further extended, prograde surface zonal flows in high latitudes start to develop, and become prominent. This result suggests that surface zonal flows obtained by the previous studies may not be statistically steady states.