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Temporal trends of the concentration and sources of secondary organic aerosols in PM2.5 in Shanghai during 2012 and 2018
Atmospheric Environment ( IF 4.2 ) Pub Date : 2021-07-02 , DOI: 10.1016/j.atmosenv.2021.118596
Yan Zhong 1 , Junwei Chen 1 , Qianbiao Zhao 2 , Ning Zhang 1 , Jialiang Feng 1 , Qingyan Fu 2
Affiliation  

Based on the concentrations of the carbonaceous components and the typical organic tracers in 682 p.m.2.5 samples collected in Shanghai from 2012 to 2018, the temporal trends of the concentrations and potential sources of the secondary organic aerosols in PM2.5 in Shanghai were investigated. The annual average concentrations of organic carbon (OC), elemental carbon (EC) and water-soluble organic carbon (WSOC) all showed a decreasing trend along with the PM2.5 concentration. The annual concentration of total carbon (TC) in 2018 (4.3 μg m−3) was about 34% of that in 2012. Compared with that in 2013, the concentrations of isoprene and sesquiterpene SOA tracers in 2018 decreased by 48% and 43%. Meanwhile, the concentration of monoterpene SOA tracers kept stable in 2 ng m−3 to 3 ng m−3, and the concentration of toluene SOA tracer decreased slightly from 1.3 ng m−3 in 2013 to 1.0 ng m−3 in 2018. Correlation analysis with levoglucosan suggested that biomass burning should be an important source of sesquitertene in Shanghai. It was found that the 2-MGA/2-MTLs ratio of the isoprene tracers was more strongly affected by the ambient temperature but not NOx in Shanghai. The concentration of secondary organic carbon (SOC) estimated with OC/EC-based, WSOC-based and tracer-based methods showed a decreasing trend during the study period, but the contribution of SOC to OC was increasing. Anthropogenic aromatic volatile organic compounds was the increasingly important contributor to the SOC in PM2.5, and should be the key pollutants to be controlled to further improve the air quality in Shanghai.



中文翻译:

2012-2018年上海市PM 2.5二次有机气溶胶浓度及来源的时间趋势

基于2012-2018年上海采集的682个pm 2.5样品的含碳组分浓度和典型有机示踪剂,研究了上海PM 2.5二次有机气溶胶浓度和潜在来源的时间趋势。有机碳(OC)、元素碳(EC)和水溶性有机碳(WSOC)年均浓度均随PM 2.5浓度呈下降趋势。2018年总碳(TC)年浓度(4.3 μg m -3)约为2012年的34%。与2013年相比,2018年异戊二烯和倍半萜SOA示踪剂浓度分别下降48%和43%。同时,单萜SOA示踪剂的浓度稳定在2 ng m -3到3 ng m -3 之间,甲苯SOA示踪剂的浓度从2013年的1.3 ng m -3小幅下降到1.0 ng m -32018年与左旋葡聚糖的相关性分析表明,生物质燃烧应该是上海倍半萜烯的重要来源。发现异戊二烯示踪剂的 2-MGA/2-MTLs 比受环境温度的影响更大,但在上海不受 NOx 的影响。使用基于OC/EC、基于WSOC和基于示踪剂的方法估算的次生有机碳(SOC)浓度在研究期间呈下降趋势,但SOC对OC的贡献正在增加。人为芳香族挥发性有机化合物是 PM 2.5 中SOC 越来越重要的贡献者,应成为进一步改善上海空气质量需要控制的关键污染物。

更新日期:2021-07-12
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