P58 Evaluation of Planetary Boundary Layer Schemes in WRF Model for Precipitation Forecast over Northern China

Lu, Bin, Institute of Urban Meteorology, China Meteorological Administration, Wei Wang, National Center for Atmospheric Research/Mesoscale and Microscale Meterology Laboratory, Min Chen and Shuiyong Fang, IUM/CMA, China

Verification of WRF-based operational forecast system at 3 km for Beijing and its surrounding areas over five summer seasons from 2012 – 2016 showed a bias in precipitation forecast. There is an over-prediction of precipitation in the mountain areas and under-prediction on the plains. Compared with observation and ERA-Interim analysis, the operational model, which uses ACM2 planetary boundary layer (PBL) scheme, has a warmer and drier boundary layer, and lower CAPE during the day. The sensitivity of the model configuration to different PBL schemes is investigated using WRFV3.8.1. It is found that ACM2 produces the warmest and driest boundary layer compared to other schemes. Results will be analyzed and reported at the workshop.