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首页> 外文期刊>Environmental Science & Technology >Relationship between Oxidation Level and Optical Properties of Secondary Organic Aerosol
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Relationship between Oxidation Level and Optical Properties of Secondary Organic Aerosol

机译：二次有机气溶胶的氧化水平与光学性质的关系

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摘要

Brown carbon (BrC), which may include secondary organic aerosol (SOA), can be a significant climate-forcing agent via its optical absorption properties. However, the overall contribution of SOA to BrC remains poorly understood. Here, correlations between oxidation level and optical properties of SOA are examined. SOA was generated in a flow reactor in the absence of NO_X by OH oxidation of gas-phase precursors used as surrogates for anthropogenic (naphthalene, tricydo-[5.2.1.0~(2,6)]decane), biomass burning (guaiacol), and biogenic (α-pinene) emissions. SOA chemical composition was characterized with a time-of-flight aerosol mass spectrometer. SOA mass-specific absorption cross sections (MAC) and refractive indices were calculated from real-time cavity ring-down photoacoustic spectrometry measurements at 40S and 532 nm and from UV-vis spectrometry measurements of methanol extracts of filter-collected particles (300 to 600 nm). At 405 nm, SOA MAC values and imaginary refractive indices increased with increasing oxidation level and decreased with increasing wavelength, leading to negligible absorption at 532 nm. Real refractive indices of SOA decreased with increasing oxidation level Comparison with literature studies suggests that under typical polluted conditions the effect of NO_X on SOA absorption is small. SOA may contribute significantly to atmospheric BrC, with the magnitude dependent on both precursor type and oxidation level.
机译：褐碳（BrC）可能包括次级有机气溶胶（SOA），通过其光吸收特性可以成为重要的气候推动剂。但是，SOA对BrC的总体贡献仍然知之甚少。在此，研究了氧化水平与SOA光学性能之间的相关性。 SOA是在不存在NO_X的情况下，通过气相氧化前驱体生成的SOA，而气相前驱体是人为替代物（萘，三甲苯基-[5.2.1.0〜（2,6）]癸烷），生物质燃烧（愈创木酚），和生物（α-pine烯）排放。使用飞行时间气溶胶质谱仪对SOA的化学成分进行了表征。 SOA质量比吸收截面（MAC）和折射率是根据40S和532 nm处的实时腔衰荡光声光谱测量以及过滤器收集的颗粒（300至600微米）的甲醇提取物的UV-可见光谱测量得出的纳米）。在405 nm处，SOA MAC值和虚折射率随氧化水平的增加而增加，随波长的增加而减小，导致在532 nm处的吸收可忽略不计。 SOA的实际折射率随氧化水平的增加而降低与文献研究的比较表明，在典型的污染条件下，NO_X对SOA吸收的影响很小。 SOA可能对大气中的BrC做出重要贡献，其幅度取决于前驱体类型和氧化水平。

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  • 来源
    《Environmental Science & Technology》 |2013年第12期|6349-6357|共9页
  • 作者

    Andrew T. Lambe; Christopher D. Cappa; Paola Massoli; Timothy B. Onasch; Sara D. Forestieri; Alexander T. Martin; Molly J. Cummings; David R. Croasdale; William H. Brune; Douglas R. Worsnop; Paul Davidovits;

  • 作者单位

    Chemistry Department, Boston College, Chestnut Hill, Massachusetts, United States,Aerodyne Research, Inc., Billerica, Massachusetts, United States;

    Department of Civil and Environmental Engineering, University of California, Davis, California, United States;

    Aerodyne Research, Inc., Billerica, Massachusetts, United States;

    Chemistry Department, Boston College, Chestnut Hill, Massachusetts, United States,Aerodyne Research, Inc., Billerica, Massachusetts, United States;

    Department of Civil and Environmental Engineering, University of California, Davis, California, United States;

    Chemistry Department, Boston College, Chestnut Hill, Massachusetts, United States;

    Chemistry Department, Boston College, Chestnut Hill, Massachusetts, United States;

    Chemistry Department, Boston College, Chestnut Hill, Massachusetts, United States;

    Department of Meteorology and Atmospheric Sciences, The Pennsylvania State University, University Park, Pennsylvania, United States;

    Aerodyne Research, Inc., Billerica, Massachusetts, United States;

    Chemistry Department, Boston College, Chestnut Hill, Massachusetts, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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