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首页> 外文期刊>Environmental Science & Technology >Influences of Primary Emission and Secondary Coating Formation on the Particle Diversity and Mixing State of Black Carbon Particles
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Influences of Primary Emission and Secondary Coating Formation on the Particle Diversity and Mixing State of Black Carbon Particles

机译：一次排放和二次涂层形成对黑碳颗粒颗粒多样性和混合态的影响

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摘要

The mixing state of black carbon (BC) affects its environmental fate and impacts. This work investigates particle diversity and mixing state for refractory BC (rBC) containing particles in an urban environment. The chemical compositions of individual rBC-containing particles were measured, from which a mixing state index and particle diversity were determined. The mixing state index (X) varied between 26% and 69% with the average of 48% in this study and was slightly enhanced with the photochemical age of air masses, indicating that most of the rBC-containing particles cannot be simply explained by fully externally and internally mixed model. Clustering of single particle measurements was used to investigate the potential effects of different primary emissions and atmospheric processes on rBC-containing particle diversity and mixing state. The average particle species diversity and the bulk population species diversity both increased with primary traffic emissions and elevated nitrate concentrations in the morning but gradually decreased with secondary organic aerosol (SOA) formation in the afternoon. The single particle clustering results illustrate that primary traffic emissions and entrainment of nitrate-containing rBC particles from the residual layer to the surface could lead to more heterogeneous aerosol compositions, whereas substantial fresh SOA formation near vehicular emissions made the rBC-containing particles more homogeneous. This work highlights the importance of considering particle diversity and mixing state for investigating the chemical evolution of rBC-containing particles and the potential effects of coating on BC absorption enhancement.
机译：黑碳（BC）的混合状态会影响其环境命运和影响。这项工作研究了城市环境中含难熔BC（rBC）颗粒的颗粒多样性和混合状态。测量了单个含有rBC的颗粒的化学组成，由此确定了混合状态指数和颗粒多样性。这项研究中的混合状态指数（X）在26％到69％之间变化，平均值为48％，并且随着空气质量的光化学年龄而略有增强，表明大多数含rBC的颗粒不能完全通过简单的解释来解释。内部和外部混合模型。使用单个颗粒测量的聚类来研究不同的一次排放和大气过程对含rBC的颗粒多样性和混合状态的潜在影响。平均颗粒物物种多样性和总体种群物种多样性都随着主要交通排放和早晨硝酸盐浓度的增加而增加，但随着下午次生有机气溶胶（SOA）的形成而逐渐减少。单颗粒聚类结果表明，主要的交通排放和从残留层到表面的含硝酸盐的rBC颗粒的夹带可能导致更多的异质气溶胶成分，而在车辆排放附近形成大量的新鲜SOA使得含rBC的颗粒更加均匀。这项工作强调了在研究含rBC的颗粒的化学演变以及涂层对BC吸收增强的潜在影响时，考虑颗粒多样性和混合状态的重要性。

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  • 来源
    《Environmental Science & Technology》 |2019年第16期|9429-9438|共10页
  • 作者

    Lee Alex K. Y.; Rivellini Laura-Helena; Chen Chia-Li; Liu Jun; Price Derek J.; Betha Raghu; Russell Lynn M.; Zhang Xiaolu; Cappa Christopher D.;

  • 作者单位

    Natl Univ Singapore Dept Civil & Environm Engn Singapore 117576 Singapore|Natl Univ Singapore NUS Environm Res Inst Singapore 117411 Singapore;

    Natl Univ Singapore NUS Environm Res Inst Singapore 117411 Singapore;

    Univ Calif San Diego Scripps Inst Oceanog La Jolla CA 92093 USA|Natl Taiwan Univ Dept Atmospher Sci Taipei 10617 Taiwan;

    Univ Calif San Diego Scripps Inst Oceanog La Jolla CA 92093 USA;

    Univ Calif San Diego Scripps Inst Oceanog La Jolla CA 92093 USA|Univ Colorado Dept Chem Boulder CO 80309 USA;

    Univ Calif Davis Dept Civil & Environm Engn Davis CA 95616 USA|Univ Calif Davis Crocker Nucl Lab Davis CA 95616 USA;

    Univ Calif Davis Dept Civil & Environm Engn Davis CA 95616 USA;

  • 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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