Fine particulate matter(PM2.5)chemically-speciated source profiles of stationary combustion sources,industrial process sources,on-road mobile source and fugitive dust source derived from local studies and SPECIATE database were compared.We used the regional air quality model CMAQ to identify the influence of different source profiles on the simulation results.The results showed that:(1) PM2.5 chemical source profiles derived from local studies and SPECIATE database were different due to the discrepancy of the development level,emission standards,sampling and analysis method and dust removal equipment.(2)Sources with large differences were coal combustion power plants,cement manufacturing,heavy diesel vehicles and road dust,and chemical components with large differences were SO42-,NO3-and Ca.(3)Differences in on-road mobile source profiles affected the simulations the most (0.27 μg/m3 on average),followed by those in fugitive dust and industrial process.Differences in stationary combustion had smaller impact on the simulations(only 0.10 μg/m3 on average).The results showed that it is imperative to adopt uniform sampling and analysis methods in the development of source profiles in order to provide input data for source apportionment or model simulation.Considering the simulation impacts,developing local on-road mobile source profiles is a priority task.%对比了国内外固定燃烧源、工业过程源、道路移动源和扬尘源等排放源PM2.5成分谱之间的差异,并利用CMAQ(区域空气质量模型)模拟识别各PM25成分谱之间的差异对空气质量模拟影响较大的排放源.结果表明:①由于国内外发展水平、排放标准、采样分析条件以及排放源除尘设备等的差异,各排放源PM25成分谱差异较大;②PM25成分谱差异较大的源主要有燃煤电厂、水泥制造、重型柴油车和道路扬尘等,而差异较大的组分主要有SO42-、NO3-和Ca等;③道路移动源源谱本地化对PM25的模拟影响最大,其次为扬尘源和工业过程源,而固定燃烧源则相较最小,其中道路移动源源谱本地化模拟案例与基线的PM2.5模拟质量浓度绝对差值为0.27 μg/m3,各组分质量浓度差系数之和为52.60×10-3μg/(m3·kg),而固定燃烧源源谱本地化模拟案例PM25模拟质量浓度绝对差值仅为0.10 μg/m3,各组分之和为2.12×10-3 μg/(m3·kg).研究显示,有必要采用统一的标准开展本地源成分谱测试工作,为源解析及模型模拟提供基础性数据,而从对空气质量模型模拟影响的角度出发,优先建立道路移动源本地化PM25成分谱较为重要.
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