Surface deposition of marine fog and its treatment in the Weather Research and Forecasting (WRF) model

Abstract. There have been many studies of marine fog, some using Weather Research and Forecasting (WRF) other models. Several model report overpredictions near-surface liquid water content (Qc), leading to visibility estimates that are too low. This study has found the same. One possible cause this overestimation could be treatment a surface deposition rate fog droplets at underlying surface. Most models, including Advanced (WRF-ARW) Model, available from National Center for Atmospheric (NCAR), take account gravitational settling cloud throughout domain However, there should an additional as turbulence causes collide coalesce with A surface, or any wet can then effective sink droplets. process parameterized velocity based on roughness length droplets, z0c, may significantly larger than vapour, z0q. implemented in WRF either variant Katata scheme vegetation via direct modifications boundary-layer modules.