Impacts of traffic emissions on atmospheric particulate nitrate and organics at a downwind site on the periphery of Guangzhou, China
Impacts of traffic emissions on atmospheric particulate nitrate and organics at a downwind site on the periphery of Guangzhou, China
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广州市周边顺风点交通排放对大气颗粒物硝酸盐和有机物的影响
DOI：
10.5194/acp-17-10245-2017
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发表时间：
2017-09
期刊：
影响因子：
--
通讯作者：
Chan C.K.
中科院分区：
文献类型：
--
作者：
Qin Y.M;Tan H.B.;Li Y.J.;Schurman M.I.;Li F.;Canonaco F.;Prevot A.S.H.;Chan C.K.
抽象。中国特大城市周边的颗粒物（PM）污染可能与城市本身一样严重。考虑到市中心地区大量的车辆排放，初级PM的直接运输（例如，黑碳和初级有机物）和由前体有效形成次级PM（例如，氮氧化物和挥发性有机化合物）可能会导致城市之间缓冲区的PM污染。为了研究市中心地区的交通排放如何影响这些相邻的缓冲区，2014年11月至12月，在广州市中心的下风向番禺部署了一套实时仪器。硝酸盐的质量分数在高PM的日子里更高，随着PM质量浓度从10 μ g m− 3增加到160 μg m−3，硝酸盐与硫酸盐的平均比率从0.35增加到1.5。 颗粒硝酸盐与过量铵（（[NH 4 +] scin [SO 42-]-1.5）× [SO 42-]）密切相关，由于温度较低，12月的浓度高于11月。有机物的质量分数是最高的所有PM 1水平在整个运动。虽然有机气溶胶（OA）主要由二次有机气溶胶（SOA =半挥发性含氧有机气溶胶+低挥发性含氧有机气溶胶）作为活动平均值，但在高OA期间，新鲜排放的烃类有机气溶胶（HOA）占OA的40%，通常发生在夜间，平均占23.8%至28.4%。这是由于广州市对重型车辆的日间交通限制，HOA几乎与总OA浓度呈线性增加。SOA增加奇数氧（Ox = O3 + NO2）在白天增加，由于光化学。夜间交通排放和白天光化学作用的共同作用导致了番禺PM的累积。通过减少车辆交通来缓解市中心地区的PM污染，可以潜在地改善周边地区的空气质量。
Abstract. Particulate matter (PM) pollution on the peripheries of Chinese megacities can be as serious as in cities themselves. Given the substantial vehicular emissions in inner-city areas, the direct transport of primary PM (e.g., black carbon and primary organics) and effective formation of secondary PM from precursors (e.g., NOx and volatile organic compounds) can contribute to PM pollution in buffer zones between cities. To investigate how traffic emissions in inner-city areas impact these adjacent buffer zones, a suite of real-time instruments were deployed in Panyu, downwind from central Guangzhou, from November to December 2014. Nitrate mass fraction was higher on high-PM days, with the average nitrate-to-sulfate ratio increasing from around 0.35 to 1.5 as the PM mass concentration increased from 10 to 160 µg m−3. Particulate nitrate was strongly correlated with excess ammonium (([NH4+] ∕ [SO42−] − 1.5) × [SO42−]), with higher concentrations in December than in November due to lower temperatures. The organic mass fraction was the highest across all PM1 levels throughout the campaign. While organic aerosols (OA) were dominated by secondary organic aerosols (SOA = semi-volatile oxygenated organic aerosols + low-volatility oxygenated organic aerosols) as a campaign average, freshly emitted hydrocarbon-like organic aerosols (HOA) contributed up to 40 % of OA during high-OA periods, which typically occurred at nighttime and contributed 23.8 to 28.4 % on average. This was due to daytime traffic restrictions on heavy-duty vehicles in Guangzhou, and HOA almost increased linearly with total OA concentration. SOA increased as odd oxygen (Ox = O3 + NO2) increased during the day due to photochemistry. A combination of nighttime traffic emissions and daytime photochemistry contributed to the buildup of PM in Panyu. The mitigation of PM pollution in inner-city areas by reducing vehicular traffic can potentially improve air quality in peripheral areas.
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影响因子：
6.3
作者：
Lu Xu;Sriram Suresh;Hongyu Guo;R. Weber;N. Ng
通讯作者：
Lu Xu;Sriram Suresh;Hongyu Guo;R. Weber;N. Ng
影响因子：
6.3
作者：
Yele Sun;Qi Zhang;J. Schwab;K. Demerjian;W. Chen;M. Bae;H. Hung;O. Hogrefe;Brian P. Frank
通讯作者：
Yele Sun;Qi Zhang;J. Schwab;K. Demerjian;W. Chen;M. Bae;H. Hung;O. Hogrefe;Brian P. Frank
影响因子：
6.3
作者：
Tingting Liu;Xinming Wang;W. Deng;Q. Hu;Xiang Ding;Yanli Zhang;Quanfu He;Zhangang Zhang;
通讯作者：
Tingting Liu;Xinming Wang;W. Deng;Q. Hu;Xiang Ding;Yanli Zhang;Quanfu He;Zhangang Zhang;
影响因子：
3.8
作者：
Canonaco, F.;Crippa, M.;Prevot, A. S. H.
通讯作者：
Prevot, A. S. H.
影响因子：
5
作者：
Ho, KF;Lee, SC;Yao, XH
通讯作者：
Yao, XH