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首页> 外文期刊>Environmental Science & Technology >Role of OH-lnitiated Oxidation of Isoprene in Aging of Combustion Soot
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Role of OH-lnitiated Oxidation of Isoprene in Aging of Combustion Soot

机译：OH引发的异戊二烯氧化在燃烧煤烟老化中的作用

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摘要

We have investigated the contribution of OH- initiated oxidation of isoprene to the atmospheric aging of combustion soot. The experiments were conducted in a fluoropolymer chamber on size-classified soot aerosols in the presence of isoprene, photolytically generated OH, and nitrogen oxides. The evolution in the mixing state of soot was monitored from simultaneous measurements of the particle size and mass, which were used to calculate the particle effective density, dynamic shape factor, mass fractal dimension, and coating thickness. When soot particles age, the increase in mass is accompanied by a decrease in particle mobility diameter and an increase in effective density. Coating material not only fills in void spaces, but also causes partial restructuring of fractal soot aggregates. For thinly coated aggregates, the single scattering albedo increases weakly because of the decreased light absorption and practically unchanged scattering. Upon humidification, coated particles absorb water, leading to an additional compaction. Aging transforms initially hydrophobic soot particles into efficient cloud condensation nuclei at a rate that increases in the presence of nitrogen oxides. Our results suggest that ubiquitous biogenic isoprene plays an important role in aging of anthropogenic soot, shortening its atmospheric lifetime and considerably altering its impacts on air quality and climate.
机译：我们已经研究了由OH引发的异戊二烯氧化对燃烧烟尘的大气老化的贡献。在含异戊二烯，光解生成的OH和氮氧化物的情况下，在含氟聚合物室内对尺寸分类的烟尘气溶胶进行了实验。通过同时测量粒径和质量来监测烟灰混合状态的演变，这用于计算颗粒有效密度，动态形状因子，质量分形维数和涂层厚度。当烟灰颗粒老化时，质量的增加伴随着颗粒迁移直径的减小和有效密度的增加。涂层材料不仅会填充空隙，还会导致分形烟灰团聚体发生部分重组。对于薄涂层的聚集体，由于光吸收减少和散射几乎保持不变，单个散射反照率增加很小。加湿后，涂层颗粒会吸收水，从而导致进一步的压实。老化将最初的疏水性烟灰颗粒以在存在氮氧化物的情况下增加的速率转化为有效的云凝结核。我们的结果表明，普遍存在的生物异戊二烯在人为碳烟的老化中起着重要作用，从而缩短了其大气寿命并大大改变了其对空气质量和气候的影响。

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  • 来源
    《Environmental Science & Technology》 |2013年第5期|2254-2263|共10页
  • 作者

    Alexei F. Khalizov; Yun Lin; Chong Qiu; Song Guo; Don Collins; Renyi Zhang;

  • 作者单位

    Department of Atmospheric Sciences, Texas A&M University, College Station, Texas, 77843, United States;

    Department of Atmospheric Sciences, Texas A&M University, College Station, Texas, 77843, United States;

    Department of Chemistry, Texas A&M University, College Station, Texas, 77843, United States;

    Department of Atmospheric Sciences, Texas A&M University, College Station, Texas, 77843, United States;

    Department of Atmospheric Sciences, Texas A&M University, College Station, Texas, 77843, United States;

    Department of Atmospheric Sciences, Texas A&M University, College Station, Texas, 77843, United States,Department of Chemistry, Texas A&M University, College Station, Texas, 77843, 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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