1.17 Evaluation of RAMS6.0 Boundary-Layer Simulation over Sofia (Bulgaria)

摘要

The horizontal and vertical structure of the atmospheric boundary layer over specific areas in Europe have been computed using appropriate high resolution runs of RAMS6.0 mesoscale model for short periods. The areas and periods were selected based on the availability of complex boundary layer experiments' data, so that different parametrisations within model runs could be validated. This paper discusses comparison of model results and measurements for the city of Sofia, Bulgaria. The RAMS6.0 prediction for sensible heat flux during the intensive campaign (28 September-3 October 2003) were very close to measurements, while the 10 m wind speed was highly overestimated. The results showed further that the diurnal variation of wind speed in the model is quite idealized and the simulation cannot reflect the complex mountain-valley circulation pattern typical for the city and the measurements site. The results showed that even well validated over complex terrain models when applied for "new" complex terrain conditions, do not ensure a success. Measurements for model initial conditions, data assimilation and model validation are needed for all applications of mesoscale models.