BAROCLINIC PLANETARY BOUNDARY-LAYER MODEL FOR NEUTRAL AND STABLE STRATIFICATION CONDITIONS

摘要

The temperature and wind profiles in a baroclinic atmospheric boundary layer (ABL) are investigated. Assuming stationary conditions, the turbulent state in the ABL for stable and neutral conditions is uniquely deterrriined by the Rossby number, the external stratification parameter and two external baroclinic parameters. A simple two-layer baroclinic model is developed. It consists of a surface layer (SL) and overlying Ekman-type layer. The system of dynamic and heat transfer equations is closed using K-theory. In the SL the turbulent exchange coefficient is consistent with the results of similarity theory while in the Ekman layer it is assumed constant. The universal functions in the resistance, heat and humidity transfer laws are deduced from theanalytical solutions for the wind and temperature profiles. The solutions of the ABL resistance laws for the internal ABL parameters, necessary for the calculations of the ABL profiles, are approximated in terms of the external ABL parameters. Favourableagreement of model results with the available experimental data is demonstrated.