In the framework of the Italian Antarctic Programme, a numerical simulation of a katabatic event near Terra Nova Bay on 5-6 February 1995 is performed. The three-dimensional Hydrostatic mesoscale Eta model is used. The aim is to investigate the coupling between wind, radiation balance and turbulent fluxes at the surface. The analysis is carried out by means of time series of boundary layer parameters averaged over a selected area. In this case study the absolute magnitudes of the turbulent fluxes of sensible and latent heat are comparable and the latent heat flux seems to be an important component of the surface energy balance.