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New infrared absorption cross sections for the infrared limb sounding of sulfur hexafluoride (SF6)

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journal contribution
posted on 06.07.2021, 10:00 by JJ Harrison
Sulfur hexafluoride (SF6), widely used in industry for electrical insulation, is a potent greenhouse gas with a steadily increasing atmospheric abundance. In order to monitor its concentration profiles using infrared sounders, accurate laboratory spectroscopic data are required. This work describes new high-resolution infrared absorption cross sections of pure and air-broadened sulfur hexafluoride over the spectral range 780 – 1100 cm−1, derived from spectra recorded using a high-resolution Fourier transform spectrometer (Bruker IFS 125HR) and a 26-cm-pathlength cell. Spectra were recorded at resolutions between 0.002 and 0.03 cm−1 (calculated as 0.9/MOPD; MOPD = maximum optical path difference) over a range of atmospherically relevant temperatures (189 – 294 K) and pressures (up to 751 Torr). These new absorption cross sections improve upon those previously used for remote sensing, and will provide a more accurate basis for retrievals in the future.

Funding

This study was funded as part of the UK Research and Inno- vation Natural Environment Research Council’s support of the Na- tional Centre for Earth Observation, contract number PR140015.

History

Citation

Journal of Quantitative Spectroscopy & Radiative Transfer 254 (2020) 107202

Author affiliation

Department of Physics and Astronomy

Version

VoR (Version of Record)

Published in

Journal of Quantitative Spectroscopy and Radiative Transfer

Volume

254

Publisher

Elsevier BV

issn

0022-4073

Acceptance date

06/07/2020

Copyright date

2020

Available date

06/07/2021

Language

en