北京奥运会期间CBM-Z化学机制的模拟应用

Application of CBM-Z Chemical Mechanism during Beijing Olympics

利用CBM-Z化学机制模拟了中国科学院大气物理研究所气象塔站在北京奥运会期间高臭氧时段O3浓度的日变化,评估了气象条件、北京奥运会加强控制措施以及O3前体物浓度对近地面O3生成的影响。结果表明:(1)CBM-Z化学机制较好地模拟了北京奥运会期间典型时段气象塔站O3、NO、NO2日变化特征。(2)有利于局地高臭氧事件发生的气象条件非常相似;北京奥运会加强控制措施的实施显著减少了NOx及VOCs的排放量,导致近地面O3浓度的明显下降。(3)奥运会期间VOCs和CO是影响气象塔站O3生成量的关键因素。

CBM-Z chemical mechanism was used to simulate ozone diurnal concentration at 325-m meteorological tower in the Institute of Atmospheric Physics,Chinese Academy of Sciences,and evaluated the influences of meteorological conditions,control measures,and precursors of ozone on concentration of surface ozone.The results show that CBM-Z chemical mechanism reproduces diurnal concentration of ozone,nitric oxide,and nitrogen dioxide at the 325-m meteorological tower during Beijing Olympics well,there are very similar meteorological conditions while local ozone episodes occur,Volatile Organic Compounds（VOCs） and nitrogen oxides emissions reduced through practicing environmental control measures,which induce apparent reduction of surface ozone concentration,and the key factors which affecting the concentration of ozone are VOCs and carbon monoxide.