Large-Scale Spectral Structure with a Gap in the Stably Stratified Atmosphere

T M Chen, Søren Ejling Larsen, Hans Pécseli, Torben Mikkelsen

    Research output: Contribution to journalJournal articleResearchpeer-review


    The analysis of the large-scale structure of turbulence in a stratified atmosphere is important for the prediction and modelling of turbulence. The Monin-Obukhov similarity consideration is well suited for the modelling of small-scale turbulence. But the large-scale turbulence possesses new features and parameters, as connected with the appearance of a spectral gap in the stably stratified atmosphere, for the understanding of which an analytical investigation is needed. By a group-kinetic method, we derive the anisotropic form of the transfer function and its governing eddy viscosity. On this basis, we obtain the spectral laws k-5/3, k-1, k-3 for the subranges of inertia, shear, and buoyancy, respectively. A gap connects the last two subranges by the variable anisotropy, as a result of the fall of the spectrum of the vertical velocity fluctuations. The variable anisotropy causes the deviations from the spectral laws k-1 and k-3. Our experiment supports our analytical prediction.
    Original languageEnglish
    JournalPhysica Scripta
    Issue number6
    Pages (from-to)616-620
    Publication statusPublished - 1985

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