Inter-annual variability of wintertime PM2.5 chemical composition in Xi'an, China: Evidences of changing source emissions.
Inter-annual variability of wintertime PM2.5 chemical composition in Xi'an, China: Evidences of changing source emissions.
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DOI：
10.1016/j.scitotenv.2015.12.070
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发表时间：
2016-03
期刊：
影响因子：
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通讯作者：
Hongmei Xu;Hongmei Xu;Junjie Cao;Junjie Cao;J. Chow;J. Chow;Ru-Jin Huang;Zhenxing Shen;L. Ch
中科院分区：
文献类型：
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作者：
Hongmei Xu;Hongmei Xu;Junjie Cao;Junjie Cao;J. Chow;J. Chow;Ru-Jin Huang;Zhenxing Shen;L. Ch
对西安市2006、2008、2010年冬季PM2. 5的化学特征进行了研究。计算了OC 2、EC 1和NO3−/SO 42 −比值的标志物，以调查5年期间PM2.5排放源的变化。正矩阵分解（PMF）模型用于识别和量化PM2. 5的主要来源及其贡献。结果表明，燃煤、机动车排放、扬尘和二次无机气溶胶占PM2.5质量的80%以上。这些主要来源对PM2.5质量的重要性逐年变化：燃煤是最大的贡献者（31.2% ± 5.2%），其次为二次无机气溶胶（20.9% ± 5.2%）和机动车排放2006年为19.3% ± 4.8%;该命令仍然是燃煤排放量（27.6% ± 3.4%），二次无机气溶胶（23.2% ± 6.9%），机动车排放2010年燃煤排放量进一步下降（24.1% ± 3.1%），扬尘排放量增加（19.4% ± 5.5%）。西安市PM2.5化学成分和来源贡献的变化与西安市社会经济发展有关，包括能源结构调整、能源消费、民用车辆的扩张以及城市建设活动的增加。
Chemical characteristics of PM2.5in Xi'an in wintertime of 2006, 2008, and 2010 were investigated. Markers of OC2, EC1, and NO3−/SO42 −ratio were calculated to investigate the changes in PM2.5emission sources over the 5-year period. Positive matrix factorization (PMF) model was used to identify and quantify the main sources of PM2.5and their contributions. The results showed that coal combustion, motor vehicular emissions, fugitive dust, and secondary inorganic aerosol accounted for more than 80% of PM2.5mass. The importance of these major sources to the PM2.5mass varied yearly: coal combustion was the largest contributor (31.2% ± 5.2%), followed by secondary inorganic aerosol (20.9% ± 5.2%) and motor vehicular emissions (19.3% ± 4.8%) in 2006; the order was still coal combustion emissions (27.6% ± 3.4%), secondary inorganic aerosol (23.2% ± 6.9%), and motor vehicular emissions (20.9% ± 4.6%) in 2008; while coal combustion emission further decreased (24.1% ± 3.1%) with fugitive dust (19.4% ± 5.5%) increasing in 2010. The changes in PM2.5chemical compositions and source contributions can be attributed to the social and economic developments in Xi'an, China, including energy structure adjustment, energy consumption, the expansion of civil vehicles, and the increase of urban construction activities.