A turbulent bottom boundary layer code for use in numerical ocean models

A model for a turbulent bottom boundary "slab" layer is described. The mode l is designed to fit under a standard, depth coordinate ocean general circu lation model, with a view to improving its response both for local and clim ate problems. The depth of the layer varies temporally and spatially. Both analytical and numerical versions of the model conserve energy. The model i s tested using a source of dense water on a slope, and performs satisfactor ily, with the plume spreading far more than the equivalent case without a b ottom layer.