Development of an incoherent broadband cavity-enhanced absorption spectrometer for measurements of ambient glyoxal and NO<sub>2</sub> in a polluted urban environment
<p>We report the development of an instrument for simultaneous fast measurements of glyoxal (CHOCHO) and <span class="inline-formula">NO<sub>2</sub></span> based on incoherent broadband cavity-enhanced absorption spectroscopy (IBBCEAS) in the 438–465&thins...
| Main Authors: | , , , , , , , , , , , , |
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Copernicus Publications
2019-04-01
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| Series: | Atmospheric Measurement Techniques |
| Online Access: | https://www.atmos-meas-tech.net/12/2499/2019/amt-12-2499-2019.pdf |
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| author | S. Liang S. Liang M. Qin P. Xie P. Xie P. Xie J. Duan W. Fang Y. He J. Xu J. Liu X. Li K. Tang K. Tang F. Meng F. Meng K. Ye K. Ye J. Liu J. Liu J. Liu W. Liu W. Liu W. Liu |
| author_facet | S. Liang S. Liang M. Qin P. Xie P. Xie P. Xie J. Duan W. Fang Y. He J. Xu J. Liu X. Li K. Tang K. Tang F. Meng F. Meng K. Ye K. Ye J. Liu J. Liu J. Liu W. Liu W. Liu W. Liu |
| author_sort | S. Liang |
| collection | DOAJ |
| description | <p>We report the development of an instrument for
simultaneous fast measurements of glyoxal (CHOCHO) and <span class="inline-formula">NO<sub>2</sub></span> based on
incoherent broadband cavity-enhanced absorption spectroscopy (IBBCEAS) in
the 438–465 nm wavelength region. The highly reflective cavity mirrors
were protected from contamination by <span class="inline-formula">N<sub>2</sub></span> purge gas. The reduction of the
effective cavity length was calibrated by measuring collision-induced oxygen
absorption at <span class="inline-formula">∼477</span> nm of pure oxygen gas input with and
without the <span class="inline-formula">N<sub>2</sub></span> mirror purge gas. The detection limits of the developed
system were evaluated to be 23 parts per trillion by volume (pptv, 2<span class="inline-formula"><i>σ</i></span>) for CHOCHO and 29 pptv (2<span class="inline-formula"><i>σ</i></span>) for <span class="inline-formula">NO<sub>2</sub></span> with a 30 s acquisition
time. A potential cross-interference of <span class="inline-formula">NO<sub>2</sub></span> absorption on
accurate CHOCHO measurements has been investigated in this study, as the
absorption of <span class="inline-formula">NO<sub>2</sub></span> in the atmosphere could often be several hundred-fold
higher than that of glyoxal, especially in contaminated areas. Due to
non-linear spectrometer dispersion, simulation spectra of <span class="inline-formula">NO<sub>2</sub></span> based on
traditional convolution simulation did not match the measurement spectra
well enough. In this work, we applied actual <span class="inline-formula">NO<sub>2</sub></span> spectral profile
measured by the same spectrometer as a reference spectral profile in
subsequent atmospheric spectral analysis and retrieval of <span class="inline-formula">NO<sub>2</sub></span> and
CHOCHO concentrations. This effectively reduced the spectral fitting
residuals. The instrument was successfully deployed for 24 d of
continuous measurements of CHOCHO and <span class="inline-formula">NO<sub>2</sub></span> in the atmosphere in a
comprehensive field campaign in Beijing in June 2017.</p> |
| first_indexed | 2024-04-14T01:04:01Z |
| format | Article |
| id | doaj.art-2547f941be434fe8808b7fa7797b2d09 |
| institution | Directory Open Access Journal |
| issn | 1867-1381 1867-8548 |
| language | English |
| last_indexed | 2024-04-14T01:04:01Z |
| publishDate | 2019-04-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Measurement Techniques |
| spelling | doaj.art-2547f941be434fe8808b7fa7797b2d092022-12-22T02:21:18ZengCopernicus PublicationsAtmospheric Measurement Techniques1867-13811867-85482019-04-01122499251210.5194/amt-12-2499-2019Development of an incoherent broadband cavity-enhanced absorption spectrometer for measurements of ambient glyoxal and NO<sub>2</sub> in a polluted urban environmentS. Liang0S. Liang1M. Qin2P. Xie3P. Xie4P. Xie5J. Duan6W. Fang7Y. He8J. Xu9J. Liu10X. Li11K. Tang12K. Tang13F. Meng14F. Meng15K. Ye16K. Ye17J. Liu18J. Liu19J. Liu20W. Liu21W. Liu22W. Liu23Key Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, ChinaScience Island Branch of Graduate School, University of Science and Technology of China, Hefei 230026, ChinaKey Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, ChinaKey Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, ChinaScience Island Branch of Graduate School, University of Science and Technology of China, Hefei 230026, ChinaCAS Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, ChinaKey Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, ChinaKey Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, ChinaKey Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, ChinaKey Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, ChinaState Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, ChinaState Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, ChinaKey Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, ChinaScience Island Branch of Graduate School, University of Science and Technology of China, Hefei 230026, ChinaKey Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, ChinaScience Island Branch of Graduate School, University of Science and Technology of China, Hefei 230026, ChinaKey Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, ChinaScience Island Branch of Graduate School, University of Science and Technology of China, Hefei 230026, ChinaKey Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, ChinaScience Island Branch of Graduate School, University of Science and Technology of China, Hefei 230026, ChinaCAS Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, ChinaKey Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, ChinaScience Island Branch of Graduate School, University of Science and Technology of China, Hefei 230026, ChinaCAS Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China<p>We report the development of an instrument for simultaneous fast measurements of glyoxal (CHOCHO) and <span class="inline-formula">NO<sub>2</sub></span> based on incoherent broadband cavity-enhanced absorption spectroscopy (IBBCEAS) in the 438–465 nm wavelength region. The highly reflective cavity mirrors were protected from contamination by <span class="inline-formula">N<sub>2</sub></span> purge gas. The reduction of the effective cavity length was calibrated by measuring collision-induced oxygen absorption at <span class="inline-formula">∼477</span> nm of pure oxygen gas input with and without the <span class="inline-formula">N<sub>2</sub></span> mirror purge gas. The detection limits of the developed system were evaluated to be 23 parts per trillion by volume (pptv, 2<span class="inline-formula"><i>σ</i></span>) for CHOCHO and 29 pptv (2<span class="inline-formula"><i>σ</i></span>) for <span class="inline-formula">NO<sub>2</sub></span> with a 30 s acquisition time. A potential cross-interference of <span class="inline-formula">NO<sub>2</sub></span> absorption on accurate CHOCHO measurements has been investigated in this study, as the absorption of <span class="inline-formula">NO<sub>2</sub></span> in the atmosphere could often be several hundred-fold higher than that of glyoxal, especially in contaminated areas. Due to non-linear spectrometer dispersion, simulation spectra of <span class="inline-formula">NO<sub>2</sub></span> based on traditional convolution simulation did not match the measurement spectra well enough. In this work, we applied actual <span class="inline-formula">NO<sub>2</sub></span> spectral profile measured by the same spectrometer as a reference spectral profile in subsequent atmospheric spectral analysis and retrieval of <span class="inline-formula">NO<sub>2</sub></span> and CHOCHO concentrations. This effectively reduced the spectral fitting residuals. The instrument was successfully deployed for 24 d of continuous measurements of CHOCHO and <span class="inline-formula">NO<sub>2</sub></span> in the atmosphere in a comprehensive field campaign in Beijing in June 2017.</p>https://www.atmos-meas-tech.net/12/2499/2019/amt-12-2499-2019.pdf |
| spellingShingle | S. Liang S. Liang M. Qin P. Xie P. Xie P. Xie J. Duan W. Fang Y. He J. Xu J. Liu X. Li K. Tang K. Tang F. Meng F. Meng K. Ye K. Ye J. Liu J. Liu J. Liu W. Liu W. Liu W. Liu Development of an incoherent broadband cavity-enhanced absorption spectrometer for measurements of ambient glyoxal and NO<sub>2</sub> in a polluted urban environment Atmospheric Measurement Techniques |
| title | Development of an incoherent broadband cavity-enhanced absorption spectrometer for measurements of ambient glyoxal and NO<sub>2</sub> in a polluted urban environment |
| title_full | Development of an incoherent broadband cavity-enhanced absorption spectrometer for measurements of ambient glyoxal and NO<sub>2</sub> in a polluted urban environment |
| title_fullStr | Development of an incoherent broadband cavity-enhanced absorption spectrometer for measurements of ambient glyoxal and NO<sub>2</sub> in a polluted urban environment |
| title_full_unstemmed | Development of an incoherent broadband cavity-enhanced absorption spectrometer for measurements of ambient glyoxal and NO<sub>2</sub> in a polluted urban environment |
| title_short | Development of an incoherent broadband cavity-enhanced absorption spectrometer for measurements of ambient glyoxal and NO<sub>2</sub> in a polluted urban environment |
| title_sort | development of an incoherent broadband cavity enhanced absorption spectrometer for measurements of ambient glyoxal and no sub 2 sub in a polluted urban environment |
| url | https://www.atmos-meas-tech.net/12/2499/2019/amt-12-2499-2019.pdf |
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