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首页> 外文期刊>Environmental Science & Technology >Characterization of Size-Resolved Hygroscopicity of Black Carbon-Containing Particle in Urban Environment
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Characterization of Size-Resolved Hygroscopicity of Black Carbon-Containing Particle in Urban Environment

机译：城市环境中含炭黑颗粒的尺寸分辨吸湿性表征

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摘要

The hygroscopic properties of BC-containing particles (BCc) are important to determine their wet scavenging, atmospheric lifetime, and interactions with clouds. Such information is still lacking in the real world because of the challenges in isolating BCc from other aerosols to be directly characterized. In this study, the size-resolved chemical components of BCc including the refractory BC core and associated coatings were measured by a soot particle-aerosol mass spectrometer in suburban Nanjing. The size-resolved hygroscopicity parameter of BCc (kappa(BCc)) was obtained based on this full chemical characterization of BCc. We found increased inorganic fraction and more oxidized organic coatings with thicker coatings, which modified kappa(BCc) besides the determinant of particle size. The bulk kappa(BCc), was observed to range from 0.11 to 0.34. The size-resolved kappa(BCc) consistently showed minima at coated diameter (D-coated) of 100 nm, parametrized as kappa(x) = 0.28-0.35 X exp(-0.004 X x), x = D-coated. Under critical supersaturations (SS) of 0.1% and 0.2%, the D-50 values of BCc were 200 +/- 20 and 135 +/- 18 nm, respectively. On average 33 +/- 16% and 59 +/- 20% of BCc in number could be activated at SS = 0.1% and 0.2%, respectively. These results provide constraints on surface CCN sources for the light absorbing BC-containing particles.
机译：含BC的颗粒（BCc）的吸湿性对于确定它们的湿式清除，大气寿命以及与云的相互作用非常重要。由于将BCc与其他要直接表征的气溶胶隔离存在挑战，因此在现实世界中仍然缺少此类信息。在这项研究中，BCc的尺寸分辨化学成分（包括难熔的BC芯和相关涂层）是通过南京郊区的烟尘颗粒气溶胶质谱仪测量的。基于BCc的全部化学特征，获得了BCc的尺寸分辨吸湿性参数（kappa（BCc））。我们发现增加的无机部分和更多的氧化有机涂层与较厚的涂层一起，除了改变粒径的决定因素外，还改变了κ（BCc）。观察到kappa（BCc）为0.11至0.34。尺寸分辨的κ（BCc）在涂层直径（D涂层）为100 nm时始终显示最小值，参数化为kappa（x）= 0.28-0.35 X exp（-0.004 X x），x = D涂层。在0.1％和0.2％的临界过饱和度（SS）下，BCc的D-50值分别为200 +/- 20和135 +/- 18 nm。在SS = 0.1％和0.2％时，平均可以激活33 +/- 16％的BCc和59 +/- 20％的BCc。这些结果对用于吸收光的含BC颗粒的表面CCN源提供了限制。

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  • 来源
    《Environmental Science & Technology》 |2019年第24期|14212-14221|共10页
  • 作者

    Wu Yangzhou; Liu Dantong; Wang Junfeng; Shen Fuzhen; Chen Yanfang; Cui Shijie; Ge Shun; Wu Yun; Chen Mindong; Ge Xinlei;

  • 作者单位

    Zhejiang Univ Sch Earth Sci Dept Atmospher Sci Hangzhou 310027 Zhejiang Peoples R China;

    Nanjing Univ Informat Sci & Technol Sch Environm Sci & Engn Collaborat Innovat Ctr Atmospher Environm & Equip Jiangsu Key Lab Atmospher Environm Monitoring & P Nanjing 210044 Jiangsu Peoples R China|Harvard Univ Sch Engn & Appl Sci Cambridge MA 02138 USA;

    Nanjing Univ Informat Sci & Technol Sch Environm Sci & Engn Collaborat Innovat Ctr Atmospher Environm & Equip Jiangsu Key Lab Atmospher Environm Monitoring & P Nanjing 210044 Jiangsu Peoples R China;

    Nanjing Tianbo Environm Technol Co Ltd Nanjing 210047 Jiangsu Peoples R China;

  • 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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