An Integrated Turbulence Scheme for Boundary Layers with Shallow Cumulus Applied to Pollutant Transport

摘要: Abstract A scheme is described that provides an integrated description of turbulent transport in free convective boundary layers with shallow cumulus. The uses a mass-flux formulation, as commonly found cumulus schemes, and 1.5-order closure, involving kinetic energy eddy diffusivity. Both components are active both the subcloud cloud layers. called “mass flux–diffusion.” In layer, component nonlocal transport. combines elements from schemes conceptually similar but differ detail. An entraining plume model used to find mass flux. flux continuous through base. lateral fractional entrainment rate constant height, while detrainment-rate profile reduces smoothly zero at top. diffusivity comes energy–length scale formulation. has been implemented simple one-dimensional (single column...