Relationships between Long Time Haze Weather and Boundary Layer Meteorological Conditions
YANG Xue-yan;DU Qian;MU Xiu-xiang;Jilin Province Meteorological Observatory;
Using the surface meteorological observation data and the sounding data,the meteorological conditions during the long time haze weather in Changchun Jan. 11-17,2013 were analyzed from circulation situation,boundary layer wind speed,intensity of inversion,vertical humidity distribution,the mixed layer height,ventilation coefficient etc. The results indicated that the haze occurred in the condition of weak trough disturbances and weak cold air. Strong boundary layer inversion,low wind speed,high humidity and the mixed layer height lasts for less than 800 meters,the boundary layer ventilation coefficient lasts less than 3 000 m2/ s,caused weak ability of atmospheric horizontal diffusion and vertical exchange,which lead to the persistent haze weather.