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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Volume 8, issue 8
Atmos. Meas. Tech., 8, 3197-3207, 2015
https://doi.org/10.5194/amt-8-3197-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
Atmos. Meas. Tech., 8, 3197-3207, 2015
https://doi.org/10.5194/amt-8-3197-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 12 Aug 2015

Research article | 12 Aug 2015

New and improved infrared absorption cross sections for dichlorodifluoromethane (CFC-12)

J. J. Harrison1,2 J. 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. Despite its widespread commercial use throughout the twentieth century, primarily in the refrigeration industry, dichlorodifluoromethane (CFC-12) is now known to have the undesirable effect of depleting stratospheric ozone. As this long-lived molecule slowly degrades in the atmosphere, monitoring its vertical concentration profile using infrared sounders on satellite platforms crucially requires accurate laboratory spectroscopic data. This work describes new high-resolution infrared absorption cross sections of dichlorodifluoromethane over the spectral range 800–1270 cm−1, determined from spectra recorded using a high-resolution Fourier transform spectrometer (Bruker IFS 125HR) and a 26 cm pathlength cell. Spectra of dichlorodifluoromethane/dry synthetic air mixtures were recorded at resolutions between 0.01 and 0.03 cm−1 (calculated as 0.9/MOPD; MOPD = maximum optical path difference) over a range of temperatures and pressures (7.5–761 Torr and 190–294 K) appropriate for atmospheric conditions. This new cross-section dataset improves upon the one currently available in the HITRAN and GEISA databases.

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Short summary
Using infrared sounders on satellite platforms to monitor concentrations of atmospheric CFC-12, a stratospheric-ozone-depleting molecule with a long lifetime, crucially requires accurate laboratory spectroscopic data. This work describes a new high-resolution infrared absorption cross-section data set for remote-sensing purposes; this dataset improves upon the one currently available in the HITRAN and GEISA databases.
Using infrared sounders on satellite platforms to monitor concentrations of atmospheric CFC-12,...
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