Seasonal variation of carbonaceous pollutants in PM2.5 at an urban 'supersite' in Shanghai, China.
Seasonal variation of carbonaceous pollutants in PM2.5 at an urban 'supersite' in Shanghai, China.
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DOI：
10.1016/j.chemosphere.2015.12.036
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发表时间：
2016-03
期刊：
影响因子：
8.8
通讯作者：
Fengwen Wang;Zhigang Guo;Tian Lin;N. Rose
中科院分区：
文献类型：
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作者：
Fengwen Wang;Zhigang Guo;Tian Lin;N. Rose
2011年10月至2012年8月，在上海市某城区采集了不同季节的多个PM2. 5样品，分析了其中的碳污染物。来自复旦大学“超级”空气质量监测站的数据已被研究人员用于研究雾霾事件的形成机制。测定了这些样品的有机碳（OC）、元素碳（EC）、正构烷烃的特征和含量，以及藿烷的相对丰度。结果表明，有机碳、有机氯和正构烷烃的浓度存在明显的年周期变化，春季和冬季的浓度值较高（分别为8.6 μg/m3、3.3 μg/m3和136.4 ng/m3），秋季和夏季的浓度值较低（分别为6.6 μg/m3、2.6 μg/m3和73.8 ng/m3）。EC与OC在各季节的来源基本一致。石油渣油是正构烷烃的主要来源，四季对目标C14-C33正构烷烃的贡献率为71.4%。主成分分析和藿烷类化合物的组成表明，机动车尾气排放的含碳气溶胶比燃煤排放的含碳气溶胶多。这些数据可以为上海和中国其他城市减少碳污染物排放和改善空气质量的措施提供重要信息。
Multiple PM2.5samples collected through different seasons from October 2011 to August 2012 at an urban site in Shanghai, China were analyzed for carbonaceous pollutants. Data from this site, a ‘super’ air quality monitoring station at Fudan University, has been used by researchers to investigate the formation mechanism of haze episodes. The characteristics and concentrations of organic carbon (OC), elemental carbon (EC),n-alkanes, as well as relative abundances of hopanes, in these samples were determined. The concentrations showed a pronounced annual cycle with higher values in cold seasons (spring and winter, mean: 8.6 μg/m3, 3.3 μg/m3and 136.4 ng/m3for OC, EC andn-alkanes, respectively) and lower values in warm seasons (fall and summer, mean: 6.6 μg/m3, 2.6 μg/m3and 73.8 ng/m3for OC, EC andn-alkanes, respectively). EC generally displayed a common source with that of OC in all seasons. Petroleum residue was the major source ofn-alkanes, contributing 71.4% to the targeted C14–C33n-alkanes over four seasons. Principal components analysis and the composition of hopanes showed that emissions from vehicle exhaust contributed more carbonaceous aerosols than coal combustion. These data could provide important information for measures to reduce carbonaceous pollutant emissions and improve air quality in Shanghai, and other urban centers across China.