A comparison of Eddy Diffusivity Mass Flux schemes for simulation of the planetary boundary layer and shallow cloud

Many Eddy Diffusivity – Mass Flux (EDMF) parameterizations exist or are planned. They all use the same conceptual framework, but differ in detailed ways that could be important. A comparison study is executed and analyzed to understand the impact of different implementations. Two simple cases with strong theoretical or observational backing are used. Eight models from six groups around the world are included. It is found that the main differences between the schemes have to do with the amount of heat and moisture transport in the upper boundary layer, across the entrainment zone, and into the cloud layer when present. The results can be used to improve the schemes.