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Parameterisation of convective PBL using surface data for the wind and stability classes

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A simple two-layer model of convective planetary boundary layer (CPBL), consisting of a Surface Layer and an Ekman layer over it and developed in accordance with the similarity theory is used to obtain the vertical profiles of the temperature, wind velocity and the turbulent exchange coefficient in CPBL from the surface wind measurements and atmospheric stability data. As input to this model the internal to CPBL parameters are needed. The internal parameters can be obtained from the experimental data applying two approaches: first one (called 'top-down' approach) uses data for the geostrophic wind and the potential temperature. The second one (called here 'bottom-up' approach) uses data from the surface meteorological observations. The description of this approach is the subject of the present paper. The proposed approach determines the external to CPBL parameters from the meteorological data measured in the surface layer on the basis of the Similarity theory. The comparison of the CPBL model simulations with some experimental data from Sofia shows reasonable consistency with the proceeded experimental data.

Keywords: Convective Planetary Boundary Layer, CPBL parameterisation, similarity theory, resistance laws

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