WRF MODEL ERRORS ASSOCIATED WITH THE TURBULENCE PARAMETERIZATIONS IN WEAKLY STABLE NIGHTS
Keywords:Nocturnal temperatures. Turbulence parameterization. Weakly stable regime. WRF model. Grid spacing.
The quality of nocturnal temperatures forecast by different parameterizations of the atmospheric boundary layer is evaluated. To do that, the WRF model is used. Three different turbulence representation have been considered: Bougeault-Lacarrère (BOULAC), Mellor-Yamada-Janjic (MYJ) and Yonsei University (YSU). For YSU and BOULAC the forecast have been evaluated with a grid spacing of 12 km and for MYJ a grid spacing with 12 km and one with 4 km, centered on state of Rio Grande do Sul, in south Brazil. The more turbulent nights have been used, the less stables, to investigate what is the problems associated to the forecast error in this environment. The Richardson number parameter was the responsible by class the nights according to its stability. The errors are compared with the quality of wind speed forecast and stability parameters. The comparison shows which the model consistently underestimate nocturnal temperatures in these nights and the resolution upgrade did not work in a significative forecast improvement. Furthermore, the windy speed error in the situations with less stability is small. That indicates a existence of a problem associated with the turbulence solution by the atmospheric boundary layer schemes in this type of environment.
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