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首页> 外文期刊>Aerosol and Air Quality Research >Chemical Composition of PM2.5 and its Impact on Visibility in Guangzhou, Southern China
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Chemical Composition of PM2.5 and its Impact on Visibility in Guangzhou, Southern China

机译：广州市PM2.5的化学成分及其对能见度的影响

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A one-year field experiment was conducted in 2013 at an urban and suburban site in Guangzhou, Southern China to study the chemical compositions of PM2.5 and reconstruct the IMPROVE Algorithm to investigate the impact of aerosol components on visibility. Annual average PM2.5 mass concentration was 61.3 ± 27.6 and 54.2 ± 29.7 μg m–3 at the urban and suburban site, with organic matter (OM), sulfate (SO42–), and nitrate (NO3–) among the dominant components, accounting for 40.3%, 16.3%, and 8.0% of thePM2.5mass concentration respectively. Based on the modified IMPROVE Algorithm, the localized Mass Scattering Efficiencies(MSE) for sulfate and nitrate was obtained, with values of 2.16 ± 0.34m2g–1and 2.63 ± 0.66m2g–1at urban site and 2.22±0.31 m2 g–1 and 2.76 ± 0.84m2g–1at suburban site. Hygroscopic growth factors (Gf) for OM and EC were also taken intoconsideration with average values of 1.28 ± 0.13m2g–1and 1.15 ± 0.11m2g–1at the urban site and 1.18 ± 0.09m2g–1and1.10±0.09m2g–1at the suburban site. The estimated total light extinction coefficient was 294.7 ± 106.9 and 255.8 ± 119.0 Mm–1at the urban and suburban site, with OM,SO42–and NO3– contributing 41.7%, 16.5% and 11.5% at the urban site, and 42.1%,21.3% and 9.1% at the suburban site. Secondary water-soluble ions and OM as a whole was becoming increasingly vital under polluted conditions, with nitrate in particular being more important under heavily polluted conditions in Guangzhou.
机译：2013年，在中国南方广州的一个城市和郊区进行了为期一年的野外试验，研究了PM2.5的化学成分，并重构了IMPROVE算法，以研究气溶胶成分对能见度的影响。在城市和郊区，年平均PM2.5质量浓度为61.3±27.6和54.2±29.7μgm–3，主要成分为有机物（OM），硫酸盐（SO42–）和硝酸盐（NO3–），分别占PM2.5质量浓度的40.3％，16.3％和8.0％。基于改进的IMPROVE算法，获得了硫酸盐和硝酸盐的局部质量散射效率（MSE），在城市站点分别为2.16±0.34m2g-1和2.63±0.66m2g-1，在2.22±0.31 m2 g-1和2.76±在郊区约0.84m2g-1。还考虑了OM和EC的吸湿性生长因子（Gf），城市地区的平均值为1.28±0.13m2g-1，而城市地区的平均值为1.15±0.11m2g-1，郊区的平均值为1.18±0.09m2g-1和1.10±0.09m2g-1。 。在城市和郊区，估计的总消光系数分别为294.7±106.9和255.8±119.0 Mm-1，其中OM，SO42和NO3-分别占市区的41.7％，16.5％和11.5％，以及42.1％，21.3 ％和9.1％在郊区站点。在污染条件下，二次水溶性离子和有机溶剂作为一个整体变得越来越重要，尤其是在广州，硝酸盐在严重污染条件下更为重要。

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