Modelling the evolution of the nocturnal boundary layer for three different nights in CASES-99

摘要: The evolution of the stable nocturnal boundary layer over land (SBL) is largely determined by three physical processes: turbulent mixing, radiative cooling and heat exchange with underlying soil. Depending on relative importance each process, one following SBL-archetypes may occur: fully turbulent, intermittent non-turbulent SBL (Van de Wiel et al., 2003). latter two are generally regarded as SBLs very type, whereas night occurs under weakly conditions (Mahrt 1998). In situation, wind shear dominating factor, in nonturbulent surface conduction from soil dominate. For SBL, periods alternating increasing decreasing fluxes occur, so that process changes time. challenge to develop a model able capture these archetypes differ dynamically. From practical point view, there clear need for better description Numerical Weather Prediction climate modelling. Current weather prediction models not capable simulating boundary-layers often enhanced mixing formulations utilised (not based observations). This lead unrealistic deep (Beljaars Viterbo, 1998) strong sensitivity choices empirical parameters (Viterbo 1999; Holtslag, this study we use fine-scale single column detailed description, prescribed dynamical forcings. We compare results local observations CASES99 experiment, Kansas U.S.A. (Poulos 2002).