Based on T213 data, conventional observation data, a dense fog occurred in North China plain bewteen 19-21, November, 2005 was simulated by using mesoscale model MM5. Results show that The heavy fog is a radiation fog occurred in stabile synoptic situation. The location, intensity, formation and dissipation of simulated fog are in accordance with the real situation. Mechanism of Occurrence and dissipation of fog is studied. The characteristics of meteorological element standing for fog are also analysized. Based on these studies, The characteristics of dynamical factor and thermodynamics factor and vapor factor and diabatic factor are investigated by using Diagnostic analysis. Finally, by using topographic sensitivity experiment, Taihang mountain's influence on North china plain's fog is analysized. In the meantime, the reason of its affection is also discussed. |