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Large-eddy simulations of stably stratified flows are carried out andanalyzed using the mesoscale atmospheric model Méso-NH for applications tokilometer- and subkilometer-scale turbulence in the in the uppertroposphere–lower stratosphere. Different levels of turbulence are generated using alarge-scale stochastic forcing technique that was especially devised to treatatmospheric stratified flows. The study focuses on the analysis of turbulencestatistics, including mean quantities and energy spectra, as well as on adetailed description of flow topology. The impact of resolution is alsodiscussed by decreasing the grid spacing to 2 m and increasing the number ofgrid points to 8 × 10<sup>9</sup>. Because of atmospheric stratification,turbulence is substantially anisotropic, and large elongated structures formin the horizontal directions, in accordance with theoretical analysis andspectral, direct numerical simulations of stably stratified flows. It is alsofound that the inertial range of horizontal kinetic energy spectrum,generally observed at scales larger than a few kilometers, is prolonged intothe subkilometric range, down to the Ozmidov scales that obey isotropicKolmogorov turbulence. This study shows the capability of atmospheric modelslike Méso-NH to represent the turbulence at subkilometer scales

atmospheric chemistry and physics

High-resolution large-eddy simulations of stably stratified flows: application to subkilometer-scale turbulence in the upper troposphere–lower stratosphere