Self-broadening coefficients and improved line intensities for the ν7 band of ethylene near 10.5 μm, and impact on ethylene retrievals from Jungfraujoch solar spectra

Vander Auwera, J.;Fayt, André;Tudorie, M.;Rotger, M.;Mahieu, E.;et.al.
(2014) Journal of Quantitative Spectroscopy & Radiative Transfer — Vol. 148, p. 177-185 (2014)

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  • Vander Auwera, J.Service de Chimie Quantique et Photophysique, Université Libre de Bruxelles, Brussels, Belgium
    Author
  • Fayt, AndréUCLouvain
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  • Tudorie, M.Service de Chimie Quantique et Photophysique, Université Libre de Bruxelles, Brussels, Belgium
    Author
  • Rotger, M.Groupe de Spectrométrie Moléculaire et Atmosphérique, UMR 7331 CNRS-Université de Reims Champagne Ardenne, Moulin de la Housse, Reims, France
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  • Mahieu, E.Institute of Astrophysics and Geophysics, Université de Liège, Liège (Sart-Tilman), Belgium
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Abstract
Relying on high-resolution Fourier transform infrared (FTIR) spectra, the present work involved extensive measurements of individual line intensities and self-broadening coefficients for the ν7 band of 12C2H4. The measured self-broadening coefficients exhibit a dependence on both J and Ka. Compared to the corresponding information available in the latest edition of the HITRAN spectroscopic database, the measured line intensities were found to be higher by about 10% for high J lines in the P branch and lower by about 5% for high J lines of the R branch, varying between these two limits roughly linearly with the line positions. The impact of the presently measured line intensities on retrievals of atmospheric ethylene in the 949.0–952.0 cm−1 microwindow was evaluated using a subset of ground-based high-resolution FTIR solar spectra recorded at the Jungfraujoch station. The use of HITRAN 2012 with line intensities modified to match the present measurements led to a systematic reduction of the measured total columns of ethylene by −4.1±0.1%.
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Vander Auwera, J., Fayt, A., Tudorie, M., Rotger, M., Boudon, V., Franco, B., & Mahieu, E. (2014). Self-broadening coefficients and improved line intensities for the ν7 band of ethylene near 10.5 μm, and impact on ethylene retrievals from Jungfraujoch solar spectra. Journal of Quantitative Spectroscopy & Radiative Transfer, 148, 177-185. https://doi.org/10.1016/j.jqsrt.2014.07.003 (Original work published 2014)