Evaluation of Three Planetary Boundary Layer Parameterization Schemes in WRF Model for the February 28th, 2007 Gust Episode in Xinjiang
Although many studies have investigated the sensitivity of mesoscale models forecast with different Planet Boundary Layer (PBL) parameterization schemes,they mostly focus on mixed PBL driven by heat.The features and performance of different PBL parameterization schemes for the mechanically driven boundary layer have not been fully understood yet.The numerical simulations were conducted with the Weather Research and Forecasting (version 3.4.1) model to analyze a gust process that occurred in Xinjiang on February 28th,2007,based on three different PBL schemes.It shows that these three different PBL schemes can reasonably simulate the area of the gust and the trend of wind speed at 10 m above ground level.The differences of vertical mixing and entrainment of air above the PBL are the main reasons for the differences of analog results of temperature and humidity in PBL among the three schemes.The result of YSU scheme indicates more downward momentum flux from upper air and more effective potential energy transformed into kinetic energy,while the area of the gust is larger simulated by MYJ when compared with YSU and ACM2.
国家科技期刊平台
NSTL
万方数据
维普
