WRF模式不同陆面过程方案模拟兰州新区低空气象场特征

Meteorological characteristics in Lanzhou New District simulated by WRF with different land surface model parameterizations

利用WRF模式中3种陆面过程(Noah、RUC和SLAB)参数化方案对兰州新区2014年1月近地面温度场和风场进行了模拟,与兰州新区测风塔和区域气象站观测资料进行对比,研究了不同陆面过程参数化方案模拟低空气象场特征的差异.结果表明,3种陆面过程参数化方案都能较好地模拟兰州新区冬季温度场和风场特征,温度场模拟效果优于风场.3种方案对土壤湿度的不同处理,影响到感热通量、潜热通量和土壤热通量的分布,使得3种方案对近地面温度的模拟产生差异.统计分析结果表明,WRF模式陆面过程参数化方案为SLAB时模拟的兰州新区冬季近地面温度场和风场与观测结果最为接近.由于受温度模拟结果的影响,SLAB方案对大气稳定度的模拟效果最好,对兰州新区冬季近地面风场的模拟结果最稳定.

Three kinds of land surface parametefizations （Noah, RUC and SLAB） in WRF model were used to simulate near surface temperature and wind in Lanzhou New District in January, 2014 and, subse- quently, the simulated values were compared with the measured data from wind tower and regional mete- orological observation stations, so as to explore the different characteristics at simulating low altitude meteorological field of three parameterizations. The results showed that three land surface parameteriza- tions all could accurately simulate the surface temperature and wind in Lanzhou New District in winter, and the results of the temperature field were better than that of the wind field. Different treatments of soil moisture of the three parameterizations affected the distribution of sensible heat flux, latent heat flux and soil heat flux, causing differences in the simulations of near surface temperature. Statistical analysis results showed that the near surface temperature and wind simulated at the parameterization of SLAB were the closest to the observations. Due to the influence of the temperature simulation results, SLAB proved the best in simulating the atmospheric stability, and then SLAB was the most stable in the simulation of wind.