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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Volume 9, issue 2
Atmos. Meas. Tech., 9, 423–440, 2016
https://doi.org/10.5194/amt-9-423-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Atmos. Meas. Tech., 9, 423–440, 2016
https://doi.org/10.5194/amt-9-423-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 11 Feb 2016

Research article | 11 Feb 2016

A broadband cavity enhanced absorption spectrometer for aircraft measurements of glyoxal, methylglyoxal, nitrous acid, nitrogen dioxide, and water vapor

K.-E. Min1,2,a, R. A. Washenfelder1,2, W. P. Dubé1,2, A. O. Langford2, P. M. Edwards1,2,b, K. J. Zarzana1,2, J. Stutz4, K. Lu5, F. Rohrer6, Y. Zhang5, and S. S. Brown2,3 K.-E. Min et al.
  • 1Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA
  • 2Chemical Sciences Division, Earth System Research Laboratory, National Oceanic and Atmospheric Administration, Boulder, CO, USA
  • 3Department of Chemistry and Biochemistry, University of Colorado, Boulder, CO, USA
  • 4Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, CA, USA
  • 5College of Environmental Sciences and Engineering, Peking University, Beijing, China
  • 6Institute of Energy and Climate Research, IEK-8: Troposphere, Forschungszentrum Jülich GmbH, Jülich, Germany
  • anow at: School of Environmental Science and Engineering, Gwangju Institute of Science and Technology, Gwangju, Korea
  • bnow at: Department of Chemistry, University of York, York, UK

Abstract. We describe a two-channel broadband cavity enhanced absorption spectrometer (BBCEAS) for aircraft measurements of glyoxal (CHOCHO), methylglyoxal (CH3COCHO), nitrous acid (HONO), nitrogen dioxide (NO2), and water (H2O). The instrument spans 361–389 and 438–468 nm, using two light-emitting diodes (LEDs) and a single grating spectrometer with a charge-coupled device (CCD) detector. Robust performance is achieved using a custom optical mounting system, high-power LEDs with electronic on/off modulation, high-reflectivity cavity mirrors, and materials that minimize analyte surface losses. We have successfully deployed this instrument during two aircraft and two ground-based field campaigns to date. The demonstrated precision (2σ) for retrievals of CHOCHO, HONO and NO2 are 34, 350, and 80 parts per trillion (pptv) in 5 s. The accuracy is 5.8, 9.0, and 5.0 %, limited mainly by the available absorption cross sections.

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We have developed a two-channel broadband cavity enhanced absorption spectrometer for field measurements of glyoxal, methylglyoxal, nitrous acid, nitrogen dioxide, and water. We have successfully deployed this instrument during two aircraft and two ground-based field campaigns. The demonstrated precision (2σ) for retrievals of CHOCHO, HONO, and NO2 are 34, 350, and 80 parts per trillion (pptv) in 5 s, with accuracy of 5.8, 9.0 and 5.0 %.
We have developed a two-channel broadband cavity enhanced absorption spectrometer for field...
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