An Eddy-diffusivity/Mass-flux Boundary Layer Parameterization Based on the TKE Equation: a Dry Convection Case Study

  • Pedro M. M. Soares
  • Pedro M. A. Miranda
  • J. Teixeira
  • A. P. Siebesma
Palabras clave: Sub-grid mixing, Boundary layer, Turbulent kinetic energy, Turbulence and convection

Resumen

An eddy-diffusivity/mass-flux (EDMF) parameterization based on the turbulent kinetic energy equation (TKE) is proposed. The diffusive term is based on a prognostic TKE equation and the massflux term also depends on the prognostic TKE in two ways: in the initialization of a rising parcel, used for the estimation of updraft ensemble properties, and in the formulation of the mass-flux coefficient, which is proportional to the vertical velocity variance. The scheme is implemented in a onedimensional version of the MesoNH model and tested for a dry convective boundary layer case, with realistic results. In particular, the EDMF-TKE closure is able to reproduce realistically the countergradient fluxes and the top-entrainment. The proposed parameterization is appealing because it leads to an integrated and unified approach to convective boundary layer parameterization, blending together concepts associated with eddy-diffusivity, mass-flux and the turbulent kinetic energy.

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Publicado
2008-04-15
Cómo citar
Soares P. M. M., Miranda P. M. A., Teixeira J. y Siebesma A. P. (2008). An Eddy-diffusivity/Mass-flux Boundary Layer Parameterization Based on the TKE Equation: a Dry Convection Case Study. Física de la Tierra, 19, 147-161. https://revistas.ucm.es/index.php/FITE/article/view/FITE0707110147A
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