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Intercomparison of retrieval codes used for the analysis of high-resolution, ground-based FTIR measurements |
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| Authors: | F. Hase J.W. Hannigan |
| Affiliation: | a IMK-ASF, Forschungszentrum Karlsruhe, Postbach 3640, Karlsruhe 76021, Germany b Atmospheric Chemistry Division, National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80303, USA c Department of Physics, University of Denver, Denver, CO, USA d Department of Chemistry, University of Wollongong, Wollongong New South Wales 2522, Australia e NASA Langley Research Center, Hampton, VA, USA f National Institute for Water and Atmospheric Research Ltd., Lauder, PB 50061, Central Otago, New Zealand |
| Abstract: | A rigorous and systematic intercomparison of codes used for the retrieval of trace gas profiles from high-resolution ground-based solar absorption FTIR measurements is presented for the first time. Spectra were analyzed with the two widely used independent, retrieval codes: SFIT2 and PROFFIT9. Vertical profiles of O3, HNO3, HDO, and N2O were derived from the same set of typical observed spectra. Analysis of O3 was improved by using updated line parameters. It is shown that profiles and total column amounts are in excellent agreement, when similar constraints are applied, and that the resolution kernel matrices are also consistent. Owing to the limited altitude resolution of ground-based observations, the impact of the constraints on the solution is not negligible. It is shown that the results are also compatible for independently chosen constraints. Perspectives for refined constraints are discussed. It can be concluded that the error budget introduced by the radiative transfer code and the retrieval algorithm on total columns deduced from high-resolution ground-based solar FTIR spectra is below 1%. |
| Keywords: | Infrared spectroscopy Atmospheric trace gases Radiative transfer Retrieval algorithms |
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