Modeling stratocumulus-topped boundary-layer structure with statistical diffusion theory

摘要: Abstract Proper parameterization of vertical turbulent fluxes is fundamental importance in numerical simulation the atmospheric flow because surface–atmosphere exchanges are mainly associated with mixing. In this study, a for eddy diffusivity coefficient used single column model (SCM) to simulate stratocumulus-topped boundary-layer (STBL). The scheme suitable when fine resolution vertical, along coarse horizontal that does not allow structure be explicitly resolved (as mesoscale and large-scale models). obtained by fitting turbulence data collected during 2nd Aerosol Characterization Experiment (ACE-2). Mixing length-based analytical equations based on Taylor's statistical theory turbulence. Single-column simulations two ACE-2 diurnal cases nocturnal ASTEX case show good agreement between results observations both coupled decoupled situations. A noticeable characteristic scheme, since it uses first-order closure, its low computational cost.