Evaluation of BRAMS´ Turbulence Schemes during a Squall Line Occurrence in São Paulo, Brazil

This work evaluates the performance of four turbulence parameterizat ion schemes availab le in the BRAMS model during the simu lation of a Squall Line occurrence in the Metropolitan Area of Sao Paulo, Brazil, with the goal to select the parameterizat ion that possible works better for this kind of phenomena. Simu lation results were co mpared to infrared satellite images provided by GOES and to precipitation estimates fro m TRMM. Through the analysis of some meteorological fields and by using some statistical parameters such as BIAS and MSE, the anisotropic deformat ion scheme, based on Smagorinsky (1963) horizontal diffusion coefficients and its one-dimensional analog for the vertical coefficients, was considered the best scheme fo r the simulated case.