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International audienceWeather Research and Forecasting (WRF) model predictions using different boundary layer schemes andhorizontal grid spacings were compared with observational and numerical large-eddy simulation data forconditions corresponding to a dry atmospheric convective boundary layer (CBL) over the southern GreatPlains (SGP). The first studied case exhibited a dryline passage during the simulation window, and the secondstudied case was used to examine the CBL in a post-cold-frontal environment. The model runs were conductedwith three boundary layer parameterization schemes (Yonsei University, Mellor–Yamada–Janjic´, andasymmetrical convective) commonly employed within the WRF model environment to represent effects ofsmall-scale turbulent transport.A study domain was centered over the Atmospheric Radiation MeasurementProgram SGP site in Lamont, Oklahoma. Results show that near-surface flow and turbulence parameters arepredicted reasonably well with all tested horizontal grid spacings (1, 2, and 4 km) and that value addedthrough refining grid spacing was minimal at best for conditions considered in this study. In accord with thisresult, it was suggested that the 16-fold increase in computing overhead associated with changing from4- to 1-kmgrid spacing was not justified. Therefore, only differences among schemes at 4-km spacing were presented in detail. WRF model predictions generally overestimated the contribution to turbulence generation by mechanical forcing over buoyancy forcing in both studied CBL cases. Nonlocal parameterization schemes were found to match observational datamore closely than did the local scheme, although differences among the predictions with all three schemes were relatively small

Evaluating Weather Research and Forecasting (WRF) Model Predictions of Turbulent Flow Parameters in a Dry Convective Boundary Layer