四川省冬季雾的数值模拟及能见度参数化

Numerical simulation of a winter fog in Sichuan and parameterization of visibility

利用中尺度模式WRF对2009年冬季四川省入冬后最大的一次浓雾过程进行模拟,模拟结果表明,模式对雾区的模拟与实测结果基本一致,模拟的相对湿度也接近实况.利用成都双流机场的实测能见度和相对湿度资料分别用确定性和概率性方法获得能见度(Vis)和相对湿度(RH)的参数化方案,用模拟的相对湿度来估算能见度.研究结果表明,概率为5%的Vis-RH的参数化方案在浓雾过程中估算的能见度最为准确,可以为今后能见度的预报提供参考.

The heaviest tog in winter of 2009 in Sichuan province is simulated by the mesoseale model WRF, and the results show that both the simulated fog regions and relative humidity are in accordance with the observed data. The parameterization of Vis-RH is acquired by deterministic and probabilistic methods based on the data of visibility and relative humidity observed in Chengdu Shuangliu Airport, then the simulated relative humidity is used to calcu- late the visibility. The study shows that the visibility values calculated by the Vis-RH parameterization with 5% probability is most accurate, and this method can provide reference for the visibility forecast in the future.