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首页> 外文期刊>Environmental Science & Technology >Sources, Composition and Absorption Angstroem Exponent of Light-absorbing Organic Components in Aerosol Extracts from the Los Angeles Basin
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Sources, Composition and Absorption Angstroem Exponent of Light-absorbing Organic Components in Aerosol Extracts from the Los Angeles Basin

机译：洛杉矶盆地气溶胶提取物中光吸收性有机成分的来源，组成和吸收Angstroem指数

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摘要

We investigate the sources, chemical composition, and spectral properties of light-absorbing organic aerosol extracts (i.e., brown carbon, or BrC) in the Los Angeles (LA) Basin during the CalNex-2010 field campaign. Light absorption of PM_(2.5) water-soluble components at 365 run (Abs_(365)), used as a proxy for water-soluble BrC, was well correlated with water-soluble organic carbon (WSOC) (r~2 = 0.55-0.65), indicating secondary organic aerosol (SOA) formation from anthropogenic emissions was the major source of water-soluble BrC in this region. Normalizing Abs_(365) to WSOC mass yielded an average solution mass absorption efficiency (MAE_(365)) of 0.71 m~2g~(-1)C. Detailed chemical speciation of filter extracts identified eight nitro-aromatic compounds that were correlated with Abs_(365). These compounds accounted for ~4% of the overall water-soluble BrC absorption. Methanol-extracted BrC in LA was approximately 3 and 21 times higher than water-soluble BrC at 365 and 532 nm, respectively, and had a AME_(365) of 1.58 m~2g~(-1)C (Abs_(365) normalized to organic carbon mass). The water-insoluble BrC was strongly correlated with ambient elemental carbon concentration, suggesting similar sources. Absorption Angstrom exponent (A_a) (fitted between 300 and 600 nm wavelengths) was 3.2 (±1.2) for the PILS water-soluble BrC measurement, compared to 4.8 (±0.5) and 7.6 (±0.5) for methanol- and water-soluble BrC from filter extracts, respectively. These results show that fine particle BrC was prevalent in the LA basin during CalNex, yet many of its properties and potential impacts remain unknown.
机译：我们在CalNex-2010野战期间调查了洛杉矶（LA）盆地中吸收光的有机气溶胶提取物（即棕碳或BrC）的来源，化学成分和光谱特性。 365次运行时PM_（2.5）水溶性组分的光吸收（Abs_（365））用作水溶性BrC的代表，与水溶性有机碳（WSOC）密切相关（r〜2 = 0.55- 0.65），表明由人为排放形成的次级有机气溶胶（SOA）是该区域水溶性BrC的主要来源。将Abs_（365）归一化为WSOC质量可得到0.71 m〜2g〜（-1）C的平均溶液质量吸收效率（MAE_（365））。过滤器提取物的详细化学形态鉴定出与Abs_（365）相关的八种硝基-芳香族化合物。这些化合物约占水溶性BrC吸收总量的4％。洛杉矶地区甲醇提取的BrC分别比水溶性BrC高365和532 nm约3和21倍，并且AME_（365）为1.58 m〜2g〜（-1）C（Abs_（365）归一化到有机碳质量）。水不溶性BrC与周围元素碳浓度密切相关，表明来源相似。 PILS水溶性BrC测量的吸收埃指数（A_a）（适合300至600 nm波长）为3.2（±1.2），而甲醇和水溶性的分别为4.8（±0.5）和7.6（±0.5）过滤器提取物中的BrC。这些结果表明在CalNex期间LA盆地中普遍存在BrC细颗粒，但其许多性质和潜在影响仍然未知。

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  • 来源
    《Environmental Science & Technology》 |2013年第8期|3685-3693|共9页
  • 作者

    Xiaolu Zhang; Ying-Hsuan Lin; Jason D. Surratt; Rodney J. Weber;

  • 作者单位

    School of Earth and Atmospheric Sdences, Georgia Institute of Technology, Atlanta, Georgia 30332, United States ,Department of Civil and Environmental Engineering, University of California, Davis, California 95616,United States;

    Department of Environmental Sciences and Engineering, Gillings School of Global Public Heath, University of North Carolina, Chapel Hill, North Carolina 27599, United State;

    Department of Environmental Sciences and Engineering, Gillings School of Global Public Heath, University of North Carolina, Chapel Hill, North Carolina 27599, United State;

    School of Earth and Atmospheric Sdences, Georgia Institute of Technology, Atlanta, Georgia 30332, 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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