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The response of the turbulent buoyant bottom Ekman layer near a temperature front over uniform topography is studied here. The background stratification is variable across the slope; the upper slope is either neutrally or stably stratified at one-half of the gradient of the lower slope region. In case 1, a time-dependent, spatially uniform, along-isobath interior current with zero mean causes residual circulation across the boundary layer and net detachment of the fluid from the boundary layer. For forcing with time scales longer than the shutdown time scale [τ0 = f/(Nα)2; e.g., as defined by McCready and Rhines, where f is the Coriolis parameter, N is the Brunt– Vaisala frequency in the lower slope region, and α is the bottom slope], it is shown that the front represents an area of strong mean flow convergence and subsequent net detrainment of boundary layer fluid into the interior and is also a region of significant relative vorticity generation by the mean field. The residual circulation occur...

Numerical Simulations of Buoyant Ekman Layers. Part II: Rectification in Zero-Mean, Time-Dependent Forcing, and Feedback on the Interior Flow