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首页> 外文期刊>Frontiers of environmental science & eng >Ambient photolysis frequency of NO_2 determined using chemical actinometer and spectroradiometer at an urban site in Beijing
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Ambient photolysis frequency of NO_2 determined using chemical actinometer and spectroradiometer at an urban site in Beijing

机译：用化学光度计和分光光度计测定北京市某城市环境中NO_2的光解频率

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摘要

The photolysis frequency of NO_2, j(NO_2), is an important analytical parameter in the study of tropospheric chemistry. A chemical actinometer (CA) was built to measure the ambient j(NO_2) based on a high precision NO_x instrument with 1 min time resolution. Parallel measurements of the ambient j(NO_2) by using the CA and a commercial spectroradiometer (SR) were conducted at a typical urban site (Peking University Urban Environmental Monitoring Station) in Beijing. In general, good agreement was achieved between the CA and SR data with a high linear correlation coefficient (R~2 = 0.977) and a regression slope of 1.12. The regression offset was negligible compared to the measured signal level. The j(NO_2) data were calculated using the tropospheric ultraviolet visible radiation (TUV) model, which was constrained to observe aerosol optical properties. The calculated j(NO_2) was intermediate between the results obtained with CA and SR, demonstrating the consistency of all the parameters observed at this site. The good agreement between the CA and SR data, and the consistency with the TUV model results, demonstrate the good performance of the installed SR instrument. Since a drift of the SR sensitivity is expected by the manufacturer, we propose a regular check of the data acquired via SR against those obtained by CA for long-term delivery of a high quality series of j(NO_2) data. Establishing such a time series will be invaluable for analyzing the long-term atmospheric oxidation capacity trends as well as O_3 pollution for urban Beijing.
机译：NO_2的光解频率j（NO_2）是对流层化学研究的重要分析参数。建立了化学光度计（CA），以1分钟时间分辨率的高精度NO_x仪器为基础来测量环境j（NO_2）。在北京的一个典型城市站点（北京大学城市环境监测站），通过使用CA和商业光谱辐射计（SR）对环境j（NO_2）进行了并行测量。通常，CA和SR数据之间具有良好的一致性，线性相关系数较高（R〜2 = 0.977），回归斜率为1.12。与测得的信号水平相比，回归偏移可以忽略不计。利用对流层紫外可见辐射（TUV）模型计算了j（NO_2）数据，该模型被约束为观察气溶胶的光学特性。计算出的j（NO_2）介于CA和SR获得的结果之间，表明在此站点观察到的所有参数的一致性。 CA和SR数据之间的良好一致性以及与TUV模型结果的一致性，证明了已安装的SR仪器的良好性能。由于制造商预计SR灵敏度会发生漂移，因此我们建议定期检查通过SR获得的数据与CA所获得的数据，以长期传送高质量的j（NO_2）系列数据。建立这样一个时间序列对于分析北京城市的长期大气氧化能力趋势以及O_3污染将是无价的。

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  • 来源
    《Frontiers of environmental science & eng》 |2016年第6期|13.1-13.9|共9页
  • 作者

    Qi Zou; Keding Lu; Yusheng Wu; Yudong Yang; Zhuofei Du; Min Hu;

  • 作者单位

    State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China;

    State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China;

    State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China;

    State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China;

    State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China;

    State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Photolysis frequency of nitrogen dioxide; Chemical actinometer; Spectroradiometer; Tropospheric ultraviolet visible radiation model;

    机译：二氧化氮的光解频率;化学光度计分光辐射计;对流层紫外线可见辐射模型;

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