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Resolution Sensitivity and Scaling of Large-Eddy Simulations of the Stable Boundary Layer

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Abstract

Large-eddy simulations (LES) of the continuously turbulent quasi-equilibrium stable boundary layer (SBL) are conducted with grid lengths in the range of 12.5 m to 2 m, in order to explore resolution sensitivity, and determine at what point grid convergence occurs. The structure of the mean potential temperature, winds, and turbulent fluxes varies significantly over this resolution range. The highest resolution simulations show a significant degree of convergence. The dimensionless momentum diffusivity asymptotes to a value of 0.06, corresponding to a limiting flux Richardson number of 0.15.

Using the converged simulations, some scaling hypotheses underpinning first-order and second-order closure models are revisited. The effective Richardson number stability functions of the LES are compared with the forms often used in numerical weather prediction (NWP). The mixing implied by the LES is less than that used in NWP. The commonly used similarity profiles for heat and momentum fluxes, and the scalings for dissipation and pressure covariances are compared with the LES. This information could provide guidance for the next generation of SBL parametrization schemes.

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Authors and Affiliations

  1. Met Office, FitzRoy Road, Exeter, EX1 3PB, U.K.

    Robert J. Beare & Malcolm K. Macvean

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  1. Robert J. Beare
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  2. Malcolm K. Macvean
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Beare, R.J., Macvean, M.K. Resolution Sensitivity and Scaling of Large-Eddy Simulations of the Stable Boundary Layer. Boundary-Layer Meteorology 112, 257–281 (2004). https://doi.org/10.1023/B:BOUN.0000027910.57913.4d

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