Sensitivity of a general circulation model to parameterizations of cloud–turbulence interactions in the atmospheric boundary layer

摘要: Several approaches to parameterize the turbulent transport of momentum, heat, water vapour and cloud for use in a general circulation model (GCM) have been tested 1-dimensional 3-dimensional simulations. The schemes differ with respect their closure assumptions (conventional eddy diffusivity versus kinetic energy closure) also regarding treatment cloud–turbulence interactions. basic properties these parameterizations are discussed first relation column simulations stratocumulus–topped atmospheric boundary layer (ABL) under strong subsidence inversion during KONTROL experiment North Sea. It is found that K-models tend decouple from adjacent layers above below because activity calculated local variables. higher-order scheme performs better this internally generated turbulence can be transported up down through action diffusion. Thus, TKE-scheme provides not only link between sub-cloud but as result cloud-top entrainment. In stratocumulus case study, where confined by pronounced inversion, increased entrainment favours dilution enhanced evaporation droplets. GCM however, additional supports formation indirect generating processes promoted efficient ventilation ABL, such moisture supply surface depth ABL. As result, tropical convection more vigorous, hydrological cycle intensified, whole troposphere becomes warmer moister cloudiness upper part ABL increased. DOI: 10.1034/j.1600-0870.1995.t01-1-00004.x