Numerical Simulation of a Dense Land Fog Using a Scale-Aware Atmospheric Boundary Layer Turbulent Parameterization Scheme
This paper aims to improve the numerical modeling of vertical turbulent transport of water vapor and sensible heat in atmospheric boundary layer and also the simulation of fog, the three-dimensional non-hydrostatic WRF model, with the help of a scale-aware MYNN_SA scheme of both local and non-local turbulences, was used to simulate a dense foggy weather process in a broad region from Northern China to Yangtz-Huai river during 28 and 29 December 1997. Impacts of the scale-aware boundary-layer turbulent scheme on the development of stable boundary layer, turbulent transport and the simulation of fog are focused in a model resolution from meso-scale to large eddy. Compared with the surface observations in China and the ERA5 data, the scale-aware MYNN_SA scheme improved the results of sub-grid-scale turbulent mixing when model resolution closes to the gray-zone scale, which shows better fog intensity, spatial and temporal variation of the dense fog in comparison with the original MYNN scheme. Detailed vertical structures of the fog, liquid cloud water and temperature inversion are well simulated by using the scale-aware MYNN_SA scheme.