Numerical and computational methods are developed for the Large Eddy Simulation of atmospheric ows on a sphere with a spectral quasi-geostrophic model. The subgrid scales of motion are parameterised us-ing a net eddy viscosity that is derived from a high resolution reference Direct Numerical Simulation with 504 zonal and total wavenumbers or 1536 × 768 grid points (longitude by latitude). Simulations are undertaken for a wide range of truncation wavenumbers to determine the influence of resolution on the net eddy viscosity. A universal scaling law for these coeffcients is established for application to large eddy simulations of more general geophysical flows.
|Publication status||Published - 2010|