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首页> 外文期刊>Atmospheric chemistry and physics >Ground-based MAX-DOAS observations of tropospheric formaldehyde VCDs and comparisons with the CAMS model at a rural site near Beijing during APEC 2014
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Ground-based MAX-DOAS observations of tropospheric formaldehyde VCDs and comparisons with the CAMS model at a rural site near Beijing during APEC 2014

机译：基于地面的Max-DoAs对流层甲醛VCD的观察和与APEC附近北京附近的农村遗址的凸轮模型的比较

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摘要

Formaldehyde (HCHO), a key aerosol precursor, plays a significant role in atmospheric photo-oxidation pathways. In this study, HCHO column densities were measured using a Multi-AXis Differential Optical Absorption Spectroscopy (MAX-DOAS) instrument at the University of Chinese Academy of Science (UCAS) in Huairou District, Beijing, which is about 50 km away from the city center. Measurements were taken during the period of 1 October 2014 to 31 December 2014, and the Asia-Pacific Economic Cooperation (APEC) summit was organized on 5-11 November. Peak values of HCHO vertical column densities (VCDs) around noon and a good correlation coefficient R-2 of 0.73 between HCHO VCDs and surface O-3 concentration during noontime indicated that the secondary sources of HCHO through photochemical reactions of volatile organic compounds (VOCs) dominated the HCHO values in the area around UCAS. Dependences of HCHO VCDs on wind fields and backward trajectories were identified and indicated that the HCHO values in the area around UCAS were considerably affected by the transport of pollutants (VOCs) from polluted areas in the south. The effects of control measures on HCHO VCDs during the APEC period were evaluated. During the period of the APEC conference, the average HCHO VCDs were similar to 38% +/- 20% and similar to 30% +/- 24% lower than that during the pre-APEC and post-APEC periods calculated at the 95% confidence limit, respectively. This phenomenon could be attributed to both the effects of prevailing northwest wind fields during APEC and strict control measures. We also compared the MAX-DOAS results with the Copernicus Atmosphere Monitoring Service (CAMS) model. The HCHO VCDs of the CAMS model and MAX-DOAS were generally consistent with a correlation coefficient R-2 greater than 0.68. The peak values were consistently captured by both data datasets, but the low values were systematically underestimated by the CAMS model. This finding may indicate that the CAMS model can adeq
机译：甲醛（HCHO）是一种关键的气溶胶前体，在大气光氧化途径中起着重要作用。在这项研究中，使用中国科学院大学（UCAS）的多轴差动光学吸收光谱（Max-Doas）在北京，距离城市约有50公里，测量Hcho色谱柱密度中央。 2014年10月1日至2014年12月31日期间进行了测量，亚太经济合作（APEC）首脑会议于11月5日至11日组织。中午左右HCHO垂直柱密度（VCD）的峰值和HCHO VCDS和表面O-3之间的0.73的良好相关系数R-2表明，通过挥发性有机化合物（VOC）的光化学反应，HCHO的二次来源以UCAS周围的区域中的HCHO值占主导地位。鉴定了HCHO VCD对风场和向后轨迹的依赖性，并表明UCA周围地区的HCHO值受到南方污染区域的污染物（VOC）的运输影响。评估了对APEC期间HCHO VCD对杂志VCD的影响。在APEC会议期间，平均HCHO VCD与38％+/- 20％相似，比在截止前的预亚章预期和截止日期期间的30％+/- 24％相似，而在95％下计算分别有信心限制。这种现象可能归因于APEC期间普遍的西北风力场和严格控制措施的影响。我们还将MAX-DOAS与Copernicus气氛监控服务（CAMS）模型进行了比较。 CAMS模型和MAX-DOA的HCHO VCD通常与大于0.68大于0.68的相关系数R-2一致。两个数据数据集一致地捕获峰值，但是通过凸轮模型系统地低估了低值。此发现可能表明CAMS模型可以ADEQ

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  • 来源
    《Atmospheric chemistry and physics》 |2019年第2期|共19页
  • 作者

    Tian Xin; Xie Pinhua; Xu Jin; Wang Yang; Li Ang; Wu Fengcheng; Hu Zhaokun; Liu Cheng; Zhang Qiong;

  • 作者单位

    Univ Sci &

    Technol China Sch Environm Sci &

    Optoeclect Technol Hefei 230026 Anhui Peoples R China;

    Univ Sci &

    Technol China Sch Environm Sci &

    Optoeclect Technol Hefei 230026 Anhui Peoples R China;

    Chinese Acad Sci Anhui Inst Opt &

    Fine Mech Key Lab Environm Opt &

    Technol Hefei 230031 Anhui Peoples R China;

    Max Planck Inst Chem D-55128 Mainz Germany;

    Chinese Acad Sci Anhui Inst Opt &

    Fine Mech Key Lab Environm Opt &

    Technol Hefei 230031 Anhui Peoples R China;

    Chinese Acad Sci Anhui Inst Opt &

    Fine Mech Key Lab Environm Opt &

    Technol Hefei 230031 Anhui Peoples R China;

    Chinese Acad Sci Anhui Inst Opt &

    Fine Mech Key Lab Environm Opt &

    Technol Hefei 230031 Anhui Peoples R China;

    Chinese Acad Sci Anhui Inst Opt &

    Fine Mech Key Lab Environm Opt &

    Technol Hefei 230031 Anhui Peoples R China;

    Chinese Acad Sci Anhui Inst Opt &

    Fine Mech Key Lab Environm Opt &

    Technol Hefei 230031 Anhui Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 大气科学（气象学）;
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