Numerical simulation for air quality in middle and lower reaches of Yangtse River
LU Yan, FEI Jian-fang(Institute of Meteorology, PLA University of Science & Technology, Nanjing 211101, China)
Based on the pollution source data of the Asian area provided by the ACE-Asia and TRACE-P Experiments in 2002 and by means of the air quality model Models-3 that has been recently developed by EPA, this paper has simulated the changing regulations and characteristics of ozone concentration, sulfur dioxide, carbon monoxide and the total amount of nitrogen monoxide and nitrogen dioxide in the middle and lower reaches along Yangtse River for 24 hours around respectively by using the biomass burning area sources and anthropogenic area sources. The above simulations without precipitation show that: (1) The ozone concentration at the boundary layers varies remarkably fro dm day to day in the three cases, thus indicating that ozone production has close relation to the sunlight. In the boundary layer, the concentration of ozone increases with the height above the earth; (2) In the ground surface level, the concentration of sulfur dioxide, carbon monoxide and the total amount of nitrogen monoxide and nitrogen dioxide varies almost regularly daily. In the boundary layer, the concentration of these three contaminations decreases with height. The concentration decrease of the three contaminants has resulted mainly from the anthropogenic area sources. The simulation results also show that Models-3 can simulate contaminations more satisfactorily. However, both the daily average variation and vertical distribution in PBL of concentration are consistent with the former observation results.