Evaluation of a regional atmospheric model using measurements of surface heat exchange processes from a site in Antarctica

A regional atmospheric climate model with a horizontal grid spacing of 55 k m has been used to simulate the Antarctic atmosphere during an austral summ er period. ECMWF reanalyses were used to force the atmospheric prognostic v ariables from the lateral boundaries. Sea surface temperatures and the sea ice mask in the model were prescribed from observations. Parameterizations of the physical processes were taken from the ECHAM4 general circulation mo del. Before applying the model to Antarctic conditions, several adjustments had been made to the original code. In particular, a better correspondence between model output and measurements was accomplished by 1) the use of a fixed value of 0.8 for the surface albedo rather than applying an albedo th at linearly rises with surface temperature and 2) the use of the volumetric heat capacity and the thermal diffusivity of snow rather than employing th e values for ice. The model is evaluated for the period 14-19 January 1993 (P1) on the basis of an extensive dataset compiled from measurements made at a site (Svea) in Dronning Maud Land. This dataset contains boundary layer temperature and s pecific humidity profiles, snow temperatures, and surface heat fluxes. The surface fluxes were obtained from direct measurements combined with an ener gy balance model. The atmospheric temperature profiles simulated at the gri d points corresponding most closely to Svea are in good agreement with the measured profiles, although the model slightly overestimates the vertical t emperature gradient. The model probably underestimates the turbulent transp ort of heat and moisture to atmospheric layers above roughly 200 m. At Svea a cloud cover of less than 0.5 octas was observed during P1. The model ove restimates the cloud cover, which results in an underestimation of shortwav e and an overestimation of longwave radiative fluxes at the surface. The si mulated values for the net radiative fluxes, the heat flux into the snow, a nd the turbulent heat fluxes correspond within 4 W m(-2) to the fluxes that were inferred from measurements.