Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 8 16 2008 10.5194/acp-8-4517-2008 http://www.atmos-chem-phys.net/8/4517/2008/ http://www.atmos-chem-phys.net/8/4517/2008/acp-8-4517-2008.html http://www.atmos-chem-phys.net/8/4517/2008/acp-8-4517-2008.pdf 4517 4528 2008-08-05 Comparison of OMI ozone and UV irradiance data with ground-based measurements at two French sites V. Buchard buchard@loa.univ-lille1.fr C. Brogniez F. Auriol B. Bonnel J. Lenoble A. Tanskanen B. Bojkov P. Veefkind Laboratoire d'Optique Atmosphérique, Université des Sciences et Technologies de Lille, France Interaction Rayonnement Solaire Atmosphère, Université Joseph Fourier de Grenoble, France Finnish Meteorological Institute, Helsinki, Finland Goddard Earth Sciences and Technology Center, University of Maryland, Baltimore County, Baltimore, Maryland, USA Atmospheric Chemistry Dynamics Branch, NASA Goddard Space Flight Center, Greenbelt, Maryland, USA Royal Netherlands Meteorological Institute, De Bilt, The Netherlands Ozone Monitoring Instrument (OMI), launched in July 2004, is dedicated to the monitoring of the Earth's ozone, air quality and climate. OMI is the successor of the Total Ozone Mapping Spectrometer (TOMS) instruments and provides among other atmospheric and radiometric quantities the total column of ozone (TOC), the surface ultraviolet (UV) irradiance at several wavelengths, the erythemal dose rates and the erythemal daily doses. The main objective of this work is to compare OMI data with data from ground-based instruments in order to use OMI products (collection 2) for scientific studies. The Laboratoire d'Optique Atmosphérique (LOA) located in Villeneuve d'Ascq (VdA) in the north of France performs solar UV measurements using a spectroradiometer. The site of Briançon in the French Southern Alps is also equipped with a spectroradiometer operated by Interaction Rayonnement Solaire Atmosphère (IRSA). The OMI total ozone column data is obtained from the OMI-TOMS and OMI-DOAS algorithms. The comparison between the TOC retrieved with ground-based measurements and OMI-TOMS data shows good agreement at both sites for all sky conditions with a relative difference for most of points better than 5%. For OMI-DOAS data, the agreement is generally better than 7% and these data show a significant dependence on solar zenith angle. 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