Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 8 13 2008 10.5194/acp-8-3483-2008 http://www.atmos-chem-phys.net/8/3483/2008/ http://www.atmos-chem-phys.net/8/3483/2008/acp-8-3483-2008.html http://www.atmos-chem-phys.net/8/3483/2008/acp-8-3483-2008.pdf 3483 3508 2008-07-02 Technical Note: New ground-based FTIR measurements at Ile de La Réunion: observations, error analysis, and comparisons with independent data C. Senten cindy.senten@aeronomie.be M. De Mazière B. Dils C. Hermans M. Kruglanski E. Neefs F. Scolas A. C. Vandaele G. Vanhaelewyn C. Vigouroux M. Carleer P. F. Coheur S. Fally B. Barret J. L. Baray R. Delmas J. Leveau J. M. Metzger E. Mahieu C. Boone K. A. Walker P. F. Bernath K. Strong Belgian Institute for Space Aeronomy (BIRA-IASB), Brussels, Belgium Service de Chimie Quantique et Photophysique (SCQP), Université Libre de Bruxelles (ULB), Brussels, Belgium formerly at: BIRA-IASB and SCQP/ULB Laboratoire de l'Atmosphère et des Cyclones (LACy), Université de La Réunion, France Institute of Astrophysics and Geophysics, University of Liège, Liège, Belgium Department of Chemistry, University of Waterloo, Waterloo, Ontario, Canada Department of Physics, University of Toronto, Toronto, Ontario, Canada Department of Chemistry, University of York, Heslington, York, UK now at: Institut d'Aérologie, Toulouse, France Ground-based high spectral resolution Fourier-transform infrared (FTIR) solar absorption spectroscopy is a powerful remote sensing technique to obtain information on the total column abundances and on the vertical distribution of various constituents in the atmosphere. This work presents results from two FTIR measurement campaigns in 2002 and 2004, held at Ile de La Réunion (21° S, 55° E). These campaigns represent the first FTIR observations carried out at a southern (sub)tropical site. They serve the initiation of regular, long-term FTIR monitoring at this site in the near future. To demonstrate the capabilities of the FTIR measurements at this location for tropospheric and stratospheric monitoring, a detailed report is given on the retrieval strategy, information content and corresponding full error budget evaluation for ozone (O₃), methane (CH₄), nitrous oxide (N₂O), carbon monoxide (CO), ethane (C₂H₆), hydrogen chloride (HCl), hydrogen fluoride (HF) and nitric acid (HNO₃) total and partial column retrievals. Moreover, we have made a thorough comparison of the capabilities at sea level altitude (St.-Denis) and at 2200 m a.s.l. (Maïdo). 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