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A multi-limit formulation for the equilibrium depth of a stably stratified boundary layer

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Abstract

Currently no expression for the equilibrium depth of the turbulent stably-stratified boundary layer is available that accounts for the combined effects of rotation, surface buoyancy flux and static stability in the free flow. Various expressions proposed to date are reviewed in the light of what is meant by the stable boundary layer. Two major definitions are thoroughly discussed. The first emphasises turbulence and specifies the boundary layer as a continuously and vigorously turbulent layer adjacent to the surface. The second specifies the boundary layer in terms of the mean velocity profile, e.g. by the proximity of the actual velocity to the geostrophic velocity. It is shown that the expressions based on the second definition are relevant to the Ekman layer and portray the depth of the turbulence in the intermediate regimes, when the effects of static stability and rotation essentially interfere. Limiting asymptotic regimes dominated by either stratification or rotation are examined using the energy considerations. As a result, a simple equation for the depth of the equilibrium stable boundary layer is developed. It is valid throughout the range of stability conditions and remains in force in the limits of a perfectly neutral layer subjected to rotation and a rotation-free boundary layer dominated by surface buoyancy flux or stable density stratification at its outer edge. Dimensionless coefficients are estimated using data from observations and large-eddy simulations. Well-known and widely used formulae proposed earlier by Zilitinkevich and by Pollard, Rhines and Thompson are shown to be characteristic of the above interference regimes, when the effects of rotation and static stability (due to either surface buoyancy flux, or stratification at the outer edge of the boundary layer) are roughly equally important.

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Authors and Affiliations

  1. Alfred Wegener Institute for Polar and Marine Research, Am Handelshafen 12, 27570, Bremerhaven, Germany

    Sergej Zilitinkevich & Dmitrii V. Mironov

  2. Max Planck Institute for Meteorology, Bundesstr. 55, 20146, Hamburg, Germany

    Sergej Zilitinkevich

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  1. Sergej Zilitinkevich
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  2. Dmitrii V. Mironov
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Zilitinkevich, S., Mironov, D.V. A multi-limit formulation for the equilibrium depth of a stably stratified boundary layer. Boundary-Layer Meteorol 81, 325–351 (1996). https://doi.org/10.1007/BF02430334

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