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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Volume 9, issue 6
Atmos. Meas. Tech., 9, 2593-2601, 2016
https://doi.org/10.5194/amt-9-2593-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Atmos. Meas. Tech., 9, 2593-2601, 2016
https://doi.org/10.5194/amt-9-2593-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 17 Jun 2016

Research article | 17 Jun 2016

New and improved infrared absorption cross sections for chlorodifluoromethane (HCFC-22)

Jeremy J. Harrison1,2 Jeremy J. Harrison
  • 1Department of Physics and Astronomy, University of Leicester, University Road, Leicester, LE1 7RH, UK
  • 2National Centre for Earth Observation, University of Leicester, University Road, Leicester, LE1 7RH, UK

Abstract. The most widely used hydrochlorofluorocarbon (HCFC) commercially since the 1930s has been chloro-difluoromethane, or HCFC-22, which has the undesirable effect of depleting stratospheric ozone. As this molecule is currently being phased out under the Montreal Protocol, monitoring its concentration profiles using infrared sounders crucially requires accurate laboratory spectroscopic data. This work describes new high-resolution infrared absorption cross sections of chlorodifluoromethane over the spectral range 730–1380 cm−1, determined from spectra recorded using a high-resolution Fourier transform spectrometer (Bruker IFS 125HR) and a 26 cm pathlength cell. Spectra of chlorodifluoromethane/dry synthetic air mixtures were recorded at resolutions between 0.01 and 0.03 cm−1 (calculated as 0.9/MOPD; MOPD denotes the maximum optical path difference) over a range of temperatures and pressures (7.5–762 Torr and 191–295 K) appropriate for atmospheric conditions. This new cross-section dataset improves upon the one currently available in the HITRAN (HIgh-resolution TRANsmission) and GEISA (Gestion et Etude des Informations Spectroscopiques Atmosphériques) databases; in particular it provides coverage over a wider range of pressures and temperatures, has more accurate wavenumber scales, more consistent integrated band intensities, improved signal-to-noise, is free of channel fringing, and additionally covers the ν2 and ν7 bands.

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Short summary
Using infrared sounders on satellite platforms to monitor concentrations of atmospheric HCFC-22, a stratospheric-ozone-depleting molecule which is still increasing in the atmosphere, crucially requires accurate laboratory spectroscopic data. This manuscript describes a new high-resolution infrared absorption cross-section data set for remote-sensing purposes; this improves upon the one currently available in the HITRAN and GEISA databases.
Using infrared sounders on satellite platforms to monitor concentrations of atmospheric HCFC-22,...
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