Boundary-Layer Meteorology

, Volume 84, Issue 2, pp 247–266




The standard E – ε model generates aplanetary boundary layerthat appears to be much too deep. The cause of theproblem is traced to the equation for the dissipationrate (ε) of turbulent kinetic energy (E), specifically theparameterization of dissipation production anddestruction. In the context of atmosphericboundary-layer modelling, we argue that a part of thedissipation production should be modelled as the inputto the spectral cascade from the energy-containingpart of the spectrum, with a characteristic lengthℓ ε, while the ‘equilibrium’ imbalancebetween local production and destruction ofdissipation is modelled as proportional toE2/E, as in the standard model. Wepropose an E – ε – ℓ turbulence closurescheme, in which both the mixing length, ℓ m, andℓ ε are prescribed. The importance ofthe ε equation is diminished, though itstill determines the dissipation rate in the Eequation.

Neutrally-stratified Ekman layer Turbulence closure E – ε model Turbulence length scale 


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© Kluwer Academic Publishers 1997

Authors and Affiliations

    • 1
    • 1
  1. 1.Department of Earth and Atmospheric ScienceYork UniversityNorth YorkCanada

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