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首页> 外文期刊>Atmospheric Chemistry and Physics Discussions >Impacts of traffic emissions on atmospheric particulate nitrate and organics at a downwind site on the periphery of Guangzhou, China
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Impacts of traffic emissions on atmospheric particulate nitrate and organics at a downwind site on the periphery of Guangzhou, China

机译:中国广州外围顺风站点交通排放对大气中硝酸盐和有机物的影响

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pstrongAbstract./strong 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., NOsubix/i/sub and volatile organic compounds) can contribute to PM pollution in qbuffer/q 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 160span class="thinspace"/span?μga??msupa??3/sup. Particulate nitrate was strongly correlated with excess ammonium (([NHsub4/subsup+/sup]span class="thinspace"/spana??span class="thinspace"/span[SOsub4/subsup2a??/sup]span class="thinspace"/spana??span class="thinspace"/span1.5)span class="thinspace"/spana????a??span class="thinspace"/span[SOsub4/subsup2a??/sup]), with higher concentrations in December than in November due to lower temperatures. The organic mass fraction was the highest across all PMsub1/sub levels throughout the campaign. While organic aerosols (OA) were dominated by secondary organic aerosols (SOA??a??=a?? semi-volatile oxygenated organic aerosols??+ low-volatility oxygenated organic aerosols) as a campaign average, freshly emitted hydrocarbon-like organic aerosols (HOA) contributed up to 40span class="thinspace"/span% of OA during high-OA periods, which typically occurred at nighttime and contributed 23.8 to 28.4span class="thinspace"/span% 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 (Osubix/i/subspan class="thinspace"/spana??=a??span class="thinspace"/spanOsub3/subspan class="thinspace"/span+span class="thinspace"/spanNOsub2/sub) 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./p.
机译:> >摘要。中国大城市周边的颗粒物(PM)污染与城市本身一样严重。考虑到市区内大量的汽车排放,主要PM(例如黑碳和主要有机物)的直接运输和前体(例如NO x < / sub>和挥发性有机化合物)可导致城市之间缓冲区区域的PM污染。为了调查市区内的交通排放如何影响这些相邻的缓冲区,2014年11月至2014年12月,在广州市中心顺风的番yu部署了一套实时仪器。在高PM天,硝酸盐质量分数更高,随着PM质量浓度从10增加到160,平均硝酸盐与硫酸盐之比从0.35增加到1.5 class =“ thinspace”> ?μga?? m a ?? 3 < / sup>。硝酸盐颗粒与过量的铵盐(([[NH 4 + ] class =“ thinspace”> a ?? class =“ thinspace “> [SO 4 2a ?? ] class =” thinspace“> a ?? class =” thinspace“> 1.5) class =“ thinspace”> a ???? a ?? class =“ thinspace”> [SO 4 2a ?? ]),由于温度较低,12月的浓度高于11月。在整个运动中,有机物质量分数在所有PM 1 水平中最高。虽然有机气溶胶(OA)以次要有机气溶胶(SOA ?? a ?? = a ??半挥发性含氧有机气溶胶?? +低挥发性含氧有机气溶胶)作为运动平均值占主导地位,但新散发的类烃有机物气溶胶(HOA)在高OA时段(通常在夜间发生)中贡献了高达OA的40 class =“ thinspace”> %,并且通常占夜间的23.8至28.4平均>%。这是由于广州重型车辆的白天交通限制,HOA随总OA浓度线性增加。 SOA随氧的增加而增加(O x class =“ thinspace”> a ?? = a ?? class =“ thinspace”> < / span> O 3 class =“ thinspace”> + class =“ thinspace”> NO 2 )在由于光化学的一天。夜间交通排放和白天光化学的结合促进了番yu PM的积累。通过减少车辆交通来缓解市区内的PM污染,可能会改善周边地区的空气质量。

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