Non-local mixing of momentum in the convective boundary layer

Recently Frech and Mahrt proposed a closure scheme which includes a large-scale stress term to represent the effects of non-local momentum mixing in the convective boundary layer. Here large-eddy simulation (LES) datasets are used to evaluate the performance of this scheme across a range of stabilities between neutral and highly convective conditions, and as a function of baroclinity. Generally the inclusion of the non-local term in the closure model leads to results in better agreement with LES, although some modifications to the model formulation are suggested.