人为源排放VOC对北京地区臭氧生成的贡献

The contribution of anthropogenic hydrocarbons to ozone formation in Beijing areas

运用三维欧拉型区域空气质量模式(CAMx)模拟研究了北京市城近郊区人为源排放的碳氢化合物对该地区臭氧生成的贡献率.结果表明,在各类污染源中,流动源排放的碳氢化合物的贡献率最大,然后依次是油品储运与溶剂使用、工业面源和高架点源的贡献;减少北京市城近郊区人为源碳氢化合物的排放,能够同时降低该地区的臭氧平均浓度和最大浓度;另外,模拟结果还表明,北京市城近郊区的臭氧污染问题具有区域性特征,来自周边地区排放的污染物和生成的臭氧对该地区臭氧浓度水平具有一定的贡献.

The comprehensive air quality model with extensions (CAMx), a 3-D Eulerian regional air quality model, was used to study the contribution rate of anthropogenic hydrocarbons to ozone formation in the urban and suburban areas of Beijing. The results showed that among various hydrocarbon sources the hydrocarbons emitted by mobile sourcecontributed the most to ozone formation, followed in proper order by those from oil products and organic solvents,industrial area source and elevated point source. If the anthropogenic hydrocarbon emissions in the urban and suburban areas were reduced, both the average and the maximum concentrations of ozone would decrease in these areas. The results also showed that the ozone pollution in Beijing was regional in extent, and the ozone precursors emitted and the ozone formed in the peripheral areas had definite contribution to the level of ozone concentration in the urban and suburban areas of Beijing.