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

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journal contribution
posted on 15.12.2016, 09:50 by J. J. Harrison
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.

Funding

The author wishes to thank the National Centre for Earth Observation (NCEO), funded by the UK Natural Environment Research Council (NERC), for supporting this work and for access to the Molecular Spectroscopy Facility (MSF) at the Rutherford Appleton Laboratory (RAL); R. G. Williams and R. A. McPheat for providing technical support at the RAL; and J. J. Remedios for assistance in accessing the MSF.

History

Citation

Atmospheric Measurement Techniques, 2015, 8 (8), pp. 3197-3207 (11)

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomy

Version

VoR (Version of Record)

Published in

Atmospheric Measurement Techniques

Publisher

European Geosciences Union (EGU), Copernicus Publications

issn

1867-1381;1867-8548

Acceptance date

10/07/2015

Available date

15/12/2016

Publisher version

http://www.atmos-meas-tech.net/8/3197/2015/

Language

en