Turbulence and convection parametrized by a single approach: EDMF schemes

This paper presents results from a set of different parameterisation schemes based on the eddy-diffusivity/mass-flux (EDMF) approach, which has been designed to describe the dry and shallow cumulus boundary layer. The EDMF schemes are based on scale decomposition between small scale turbulence, described by eddy-diffusivity, and thermals, described by mass-flux. Results obtained with the MesoNH model, where the different schemes are implemented, indicate improvements in the representation of the convective boundary layer, with and without cumulus. Comparisons are made against Large Eddy Simulation data, corresponding to the ARM case of a diurnal cycle of cumulus convection and a dry idealized case. The different EDMF schemes developed are designed to be implemented in models with either a first-order closures for turbulence and or with higher order closures.