Line narrowing effect on the retrieval of HF and HCl vertical profiles from ground-based FTIR measurements |
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Authors: | B Barret D Hurtmans M De Mazière P-F Coheur |
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Institution: | a Université Libre de Bruxelles, Service de Chimie Quantique et Photophysique, CP 160/09 50 av. F. D. Roosevelt, B-1050 Bruxelles, Belgium b Institut d’Aéronomie Spatiale de Belgique, 3 av. Circulaire, B-1180 Bruxelles, Belgium c Université de Liège, Institut de Géophysique et d’Astrophysique, 17 Allée du 6 Août, B-4000 Liège, Belgium |
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Abstract: | Collision-induced line narrowing, which has been discovered in the 1950s and investigated thoroughly in the laboratory since then, has yet never been taken into account in the spectroscopic remote sensing of the atmosphere. This work investigates the effect of collision-induced line narrowing onto the retrieval of HCl and HF vertical profiles from ground-based solar absorption FTIR measurements made at the NDSC station of the Jungfraujoch (46.5°N, 8°E and 3580 m above see level). The retrievals are performed with the Atmosphit software, recently developed at the Université Libre de Bruxelles. It is presented in this paper for the first time and is validated against the widely used SFIT2 software. The impact of the line narrowing onto the retrieval of HCl and HF vertical profiles is examined relying on careful information content and error budget analyses. We report that the effect is relatively weak for HCl but significant for HF. Confirmation of the need to take the line narrowing into account for the retrieval of vertical profiles from ground-based FTIR spectra is given by comparison with data from the HALOE space borne instrument, rather insensitive to this spectroscopic effect. |
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Keywords: | Atmospheric infrared spectroscopy Collision-induced line narrowing Retrieval techniques Hydrogen chloride Hydrogen fluoride |
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