Baroclinic Planetary Boundary-Layer Model for Neutral and Stable Stratification Conditions |
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| Authors: | G D Djolov D L Yordanov D E Syrakov |
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| Institution: | (1) University of the North, Polokwane, South Africa;(2) Geophysical Institute, Bulgarian Academy of Sciences, Sofia, Bulgaria;(3) National Institute of Meteorology and Hydrology, Sofia, Bulgaria |
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| Abstract: | The temperature and wind profiles in abaroclinic atmospheric boundary layer (ABL) are investigated.Assuming stationary conditions, the turbulent state in the ABL forstable and neutral conditions is uniquely determined by the Rossbynumber, the external stratification parameter and two externalbaroclinic parameters. A simple two-layer baroclinic model isdeveloped. It consists of a surface layer (SL) and overlyingEkman-type layer. The system of dynamic and heat transfer equations isclosed using K-theory. In the SL the turbulent exchangecoefficient is consistent with the results of similarity theorywhile in the Ekman layer it is assumed constant. The universalfunctions in the resistance, heat and humidity transfer laws arededuced from the analytical solutions for the wind and temperatureprofiles. The solutions of the ABL resistance laws for theinternal ABL parameters, necessary for the calculations of the ABLprofiles, are approximated in terms of the external ABLparameters. Favourable agreement of model results with theavailable experimental data is demonstrated. |
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| Keywords: | Baroclinic and barotropic atmospheric boundary layer Similarity theory |
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