Modeling the evolution of the convective planetary boundary layer

Physics

Scientific paper

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Atmospheric Models, Atmospheric Stratification, Atmospheric Turbulence, Boundary Layer Flow, Convective Heat Transfer, Differential Equations, Atmospheric Boundary Layer, Atmospheric Physics, Atmospherics, Mathematical Models, Turbulent Boundary Layer

Scientific paper

The Level 3 turbulence closure model is modified (a) to incorporate the formulations for the turbulence third order moments and pressure terms proposed by Zeman and Lumley (1976) and (b) to introduce turbulence length scales which depend upon the stratification of the atmosphere. The vertical heat and moisture fluxes and the temperature humidity covariance are determined from differential equations. The model includes two other differential equations, one for the turbulence kinetic energy and the other for virtual potential temperature variance. All other turbulence variables are determined from algebraic equations. The model is used to simulate the daytime evolution of the planetary boundary layer observed on day 33 of the Wangara boundary layer experiment.

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