基于WRF不同边界层方案的黄土高原丘陵冬季地面气象要素日变化模拟分析

Simulation of Daily Variations About Surface Meteorological Factor in Loess Plateau Hilly Region in Winter Based on Different PBL Schemes of WRF

利用中尺度模式WRF 3种边界层参数化方案(YSU、MYJ和ACM2),模拟了2009年12月1～6日兰州大学半干旱气候观测站(SACOL)冬季地面感热、潜热、温度和风速的日变化,并与同期实测资料进行了对比分析。结果表明模式能较好地反映模拟期间风温的日变化,在高分辨率模拟时MYJ边界层方案对于低层风温的模拟结果明显优于YSU和ACM2方案。3种方案均能模拟出地面感热和潜热日变化,其中MYJ方案对感热模拟效果较好,ACM2方案对潜热模拟较好,但因为单一的陆面过程等物理选项,3种方案对能量的模拟均存在一定的误差。

The diurnal variations of surface, ee temperature, wind speed, sensible heat and latent heat over the Semi - Arid Climate and Environment Observatory of Lanzhou University （SACOL） from 1 to 6 December 2009 were simulated by using three different planetary boundary layer （PBL） parameterization schemes （YSU, MYJ, and ACM2） in WRF model, and then compared the simulation results with observations. The results show that the diurnal variations of surface temperature and wind were simulated quite well by the model, while the low layer surface temperature and wind were simulated better by MYJ scheme than that byYSU and ACM2 schemes under the high resolution condition. Three schemes could simulate the diurnal change of sensible heat and latent heat, and MYJ scheme simulate sensible heat better and ACM2 scheme simulate latent heat better, but simulation results of these three different PBL schemes had some difference compared with the observations.