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首页> 外文期刊>Environmental Science & Technology >Aerosol Phase State and Its Link to Chemical Composition and Liquid Water Content in a Subtropical Coastal Megacity
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Aerosol Phase State and Its Link to Chemical Composition and Liquid Water Content in a Subtropical Coastal Megacity

机译：亚热带沿海特大城市的气溶胶相态及其与化学成分和液态水含量的联系

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摘要

Particle phase state plays a key role in gas-particle partitioning, heterogeneous and multiphase reactions, and secondary aerosol formation. In this work, the rebound fraction and chemical composition of submicron particles were simultaneously measured to investigate the particle phase state and its link to chemical composition in a subtropical coastal urban city (Shenzhen, China). Submicron particles were found to be in the liquid state for most of the measurement period in spring. During the sampling time, both high relative humidity (RH, ranged from 40% to 93%) and inorganic mass fraction in particles (62.6 +/- 12.4% of dry particles, on average) resulted in abundant aerosol liquid water (43 +/- 6% in the wet PM on average), which may liquefy the particles. Considering the high frequency of ambient RH 60% and large inorganic mass fraction in aerosol particles, we deduced that particles were in the liquid state throughout the year in coastal urban areas, where this study was performed. The liquid phase particles may accelerate the mass transfer of reactive trace gases and multiphase reactions, thereby enhanced secondary aerosol formation, further resulting in a rapid growth in aerosol mass. Our work suggested that in regions heavily impacted by SO2 and NOx emissions, especially in developing countries, the presence of inorganics could significantly impact the phase state of ambient aerosol particles, and thus the mixing state of inorganic and organic matter should be taken into account for the investigation of the aerosol phase state in urban environments.
机译：颗粒相态在气体颗粒分配，非均相和多相反应以及二次气溶胶形成中起关键作用。在这项工作中，同时测量了亚微米颗粒的回弹率和化学成分，以研究亚热带沿海城市（深圳）的颗粒相态及其与化学成分的联系。在春季的大部分测量期间，发现亚微米颗粒处于液态。在采样期间，较高的相对湿度（RH，从40％到93％不等）和颗粒中的无机质量分数（平均为干颗粒的62.6 +/- 12.4％）都产生了丰富的气溶胶液态水（43 + / -湿PM中平均为6％），这可能会使颗粒液化。考虑到环境RH的频率高> 60％，并且气溶胶颗粒中的无机物质量分数较高，我们推断在进行这项研究的沿海城市地区，全年颗粒处于液态。液相颗粒可加速反应性痕量气体和多相反应的传质，从而增强了次级气溶胶的形成，进一步导致了气溶胶质量的快速增长。我们的工作表明，在受SO2和NOx排放严重影响的地区，特别是在发展中国家，无机物的存在会显着影响周围气溶胶颗粒的相态，因此，应考虑到无机物和有机物的混合状态城市环境中气溶胶相态的研究。

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  • 来源
    《Environmental Science & Technology》 |2019年第9期|5027-5033|共7页
  • 作者

    Liu Yuechen; Wu Zhijun; Huang Xiaofeng; Shen Hangyin; Bai Yao; Qiao Kai; Meng Xiangxinyue; Hu Weiwei; Tang Mingjin; He Lingyan;

  • 作者单位

    Peking Univ, Coll Environm Sci & Engn, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100871, Peoples R China;

    Peking Univ, Coll Environm Sci & Engn, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100871, Peoples R China;

    Peking Univ, Shenzhen Grad Sch, Shenzhen 518055, Peoples R China;

    Peking Univ, Shenzhen Grad Sch, Shenzhen 518055, Peoples R China;

    Peking Univ, Coll Environm Sci & Engn, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100871, Peoples R China;

    Peking Univ, Coll Environm Sci & Engn, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100871, Peoples R China;

    Peking Univ, Coll Environm Sci & Engn, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100871, Peoples R China;

    Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Guangdong, Peoples R China|Chinese Acad Sci, Guangzhou Inst Geochem, Guangdong Key Lab Environm Protect & Resources Ut, Guangzhou 510640, Guangdong, Peoples R China;

    Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Guangdong, Peoples R China|Chinese Acad Sci, Guangzhou Inst Geochem, Guangdong Key Lab Environm Protect & Resources Ut, Guangzhou 510640, Guangdong, Peoples R China;

    Peking Univ, Shenzhen Grad Sch, Shenzhen 518055, 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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