Model Analysis of Fine Particle Pollution in Beijing during the 2008 Olympic Games

【摘要】：Concentration distributions of major air pollutants over North China in the period of June-August 2008 were simulated by using a multi-scale air quality modeling system RAMS-CMAQ,and for the evaluation of the model performance,model simulated concentrations of PM2.5,O3 and NOx were compared against observations obtained at 14 stations located in Beijing and its neighboring areas.Comparison shows that modeled concentrations of PM2.5 and O3 agree with observed ones reasonably well, and the model captures major observed time-spatial variations,while large differences between modeled and simulated NOx values are found and the differences may be primarily due to coarse horizontal resolution of the model system as the model can not reflect the reality of the observation sites.Besides,the large differences are also associated with uncertainties in NOx emissions. Emission control was enforced in Beijing and its neighboring areas for the Beijing Olympic Games.In order to study the impacts of emission control upon PM2.5 and O3 concentrations,their concentrations were recalculated with the emissions without the emission control,and then discussed.