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首页> 外文期刊>Atmospheric environment >Variations in PM2.5, TSP, BC, and trace gases (NO2, SO2, and O-3) between haze and non-haze episodes in winter over Xi'an, China
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Variations in PM2.5, TSP, BC, and trace gases (NO2, SO2, and O-3) between haze and non-haze episodes in winter over Xi'an, China

机译：西安冬季冬季霾和非霾天气中PM2.5，TSP，BC和微量气体（NO2，SO2和O-3）的变化

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摘要

To investigate chemical profiles and formation mechanisms of aerosol particles in winter haze events, daily PM2.5 and TSP, 5-min BC, and 15-min trace gases (SO2, NO2, and O-3) were measured continuously during Dec. 1-31, 2012 in Xi'an. Chemical analysis was also conducted for nine water-soluble inorganic ions (Na+, NH, K+, Mg2+, Ca2+, F-, Cl-, NO3-, and SO42-), organic carbon (OC), elemental carbon (EC), and eight carbon fractions (OC1, OC2, OC3, OC4, EC1, EC2, EC3, and OP) in both PM2.5 and TSP samples. Higher levels of TSP, PM2.5, BC, SO2, and NO2, and lower levels of O-3 were observed during haze periods in comparison with non-haze days. The sum of the major secondary ionic species (Nit, NO3-, and SO42-) in PM2.5 or TSP during haze periods was about 3 times of that during non-haze days. Ion balance calculations showed that PM2.5 samples were acidic during haze periods and were close to neutral during non-haze days. The mean carbon levels were 52.9 mu g m(-3) and 82.1 mu g m(-3) in PM2.5 and TSP, respectively, during haze events, which were similar to 1.5 times of those during non-haze days. The diurnal variations of BC during non-haze days showed a bimodal distribution with two peaks coincided with traffic rush hours. This was not the case during haze periods, which exhibited a relatively smooth pattern but with high concentration levels, providing evidence of particle accumulation. The ratios of SO42-/EC, NO3-/EC, and NH4+/EC sharply increased during haze periods, indicating the important pathway of secondary inorganic species formation through aqueous-phase transformation under high relative humidity condition. This study also highlights that wintertime secondary organic carbon (SOC) formation can be an important contributor to carbonaceous aerosol, especially during haze periods. (C) 2015 Elsevier Ltd. All rights reserved.
机译：为了调查冬季霾事件中气溶胶颗粒的化学特征和形成机理，在12月1日连续测量了每日PM2.5和TSP，5分钟BC和15分钟微量气体（SO2，NO2和O-3）。 2012年-31日在西安。还对9种水溶性无机离子（Na +，NH，K +，Mg2 +，Ca2 +，F-，Cl-，NO3-和SO42-），有机碳（OC），元素碳（EC）和PM2.5和TSP样品中的八个碳组分（OC1，OC2，OC3，OC4，EC1，EC2，EC3和OP）。与非雾天相比，在雾天期间观察到较高的TSP，PM2.5，BC，SO2和NO2含量，而较低的O-3含量。雾霾时期PM2.5或TSP中主要的次要离子物种（Nit，NO3-和SO42-）的总和约为非雾霾时期的三倍。离子平衡计算表明，PM2.5样品在雾霾期间呈酸性，在非雾霾期间接近中性。在霾天气期间，PM2.5和TSP中的平均碳水平分别为52.9μg m（-3）和82.1μg m（-3），这是非霾日的1.5倍。在非霾日期间，BC的日变化显示出双峰分布，其中两个高峰与交通高峰时间一致。在雾度时期不是这种情况，雾度表现出相对平滑的模式，但是具有高浓度水平，提供了颗粒积累的证据。在雾霾时期，SO42- / EC，NO3- / EC和NH4 + / EC的比例急剧增加，这表明在高相对湿度条件下通过水相转化形成次生无机物的重要途径。这项研究还强调指出，冬季次级有机碳（SOC）的形成可能是碳质气溶胶的重要贡献者，尤其是在雾霾时期。 （C）2015 Elsevier Ltd.保留所有权利。

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  • 来源
    《Atmospheric environment》 |2015年第7期|64-71|共8页
  • 作者

    Zhang Qian; Shen Zhenxing; Cao Junji; Zhang Renjian; Zhang Leiming; Huang R. -J.; Zheng Chenjia; Wang Linqing; Liu Suixin; Xu Hongmei; Zheng Chunli; Liu Pingping;

  • 作者单位

    Xi An Jiao Tong Univ, Dept Environm Sci & Engn, Xian 710049, Peoples R China|Chinese Acad Sci, Inst Earth Environm, Key Lab Aerosol Chem & Phys, Beijing 100864, Peoples R China;

    Xi An Jiao Tong Univ, Dept Environm Sci & Engn, Xian 710049, Peoples R China|Chinese Acad Sci, Inst Earth Environm, Key Lab Aerosol Chem & Phys, Beijing 100864, Peoples R China;

    Chinese Acad Sci, Inst Earth Environm, Key Lab Aerosol Chem & Phys, Beijing 100864, Peoples R China;

    Chinese Acad Sci, Inst Atmospher Phys, Key Lab Reg Climate Environm Res Temperate East A, Beijing 100029, Peoples R China;

    Environm Canada, Air Qual Res Div, Sci & Technol Branch, Toronto, ON, Canada;

    Chinese Acad Sci, Inst Earth Environm, Key Lab Aerosol Chem & Phys, Beijing 100864, Peoples R China|Paul Scherrer Inst, Lab Atmospher Chem, CH-5232 Villigen, Switzerland|Natl Univ Ireland Galway, Ryan Inst, Ctr Climate & Air Pollut Studies, Galway, Ireland;

    Xi An Jiao Tong Univ, Dept Environm Sci & Engn, Xian 710049, Peoples R China;

    Xi An Jiao Tong Univ, Dept Environm Sci & Engn, Xian 710049, Peoples R China;

    Chinese Acad Sci, Inst Earth Environm, Key Lab Aerosol Chem & Phys, Beijing 100864, Peoples R China;

    Xi An Jiao Tong Univ, Dept Environm Sci & Engn, Xian 710049, Peoples R China;

    Xi An Jiao Tong Univ, Dept Environm Sci & Engn, Xian 710049, Peoples R China;

    Xi An Jiao Tong Univ, Dept Environm Sci & Engn, Xian 710049, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Aerosol formation; Inorganic aerosol; Organic aerosol; Secondary aerosol; Urban environment;

    机译：气溶胶形成;无机气溶胶;有机气溶胶;二次气溶胶;城市环境;

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