Stable Boundary Layer Mixing in a Vertical Diffusion Scheme

The YSU PBL scheme is a revised vertical diffusion package with a nonlocal turbulent mixing coefficient in the planetary boundary layer (PBL). Based on the study of Noh et al (2004, BLM) and accumulated results of the behavior of the Hong and Pan algorithm, a revised vertical diffusion algorithm that is suitable for weather forecasting and climate prediction models is developed. The major ingredient of the revision is the inclusion of an explicit treatment of entrainment processes at the top of the PBL. The new diffusion package is named the YonSei University (YSU) PBL (Hong et al. 2006, MWR).