南京冬季浓雾的边界层特征与数值模拟分析

利用2007年南京信息工程大学校内开展的冬季雾天边界层探测试验,分析了2007年12月13～14日南京一次大雾天气的温度、风向、风速、湿度廓线特征及其在雾生消过程中的演变规律,揭示了南京冬季大雾的边界层结构特征,并利用中尺度数值模式模拟了雾发展的整个过程。结果表明,雾发展过程中近地层逆温和湿度变化对雾的生消有很大的作用,另外,近地面层风向对平流雾的生消也有影响。中尺度数值模式能够较好地模拟雾体发展过程中温度、湿度、垂直速度等各物理量的演变,模拟雾体水汽含量可以预报雾的生消过程。

Boundary Layer Characteristics of Dense Fog in Winter and its Numerical Simulation Analysis in Nanjing

Based on boundary layer data of foggy day in winter in 2007 from Nanjing University of Information Science & Technology,the profile characteristics of temperature,wind direction,wind speed and moisture in the heavy fog weather on December 13-14 in 2007 were analyzed,as well as their evolution laws in the formation and dispersion of fog,and boundary layer characteristics of dense fog in winter in Nanjing were revealed,while the development of fog was simulated by means of mesoscale numerical model.The results showed that the formation and dispersion of fog was greatly affected by the inversion and moisture at surface layer,and wind direction at surface layer had effect on the formation and dispersion of advection fog.Mesoscale numerical model could preferably simulate the evolution of each physical quantity(such as temperature,moisture,vertical speed and so on) in the development of fog,and the simulation of water vapor content in the fog could forecast the formation and dispersion of fog.