Atmos. Chem. Phys. Discuss., 9, 11441-11479, 2009
© Author(s) 2009. This work is distributed
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Tropospheric ozone from IASI: comparison of different inversion algorithms and validation with ozone sondes in the northern middle latitudes
C. Keim1,*, M. Eremenko1, J. Orphal1, G. Dufour1, J.-M. Flaud1, M. Höpfner2, A. Boynard3, C. Clerbaux3, S. Payan4, P.-F. Coheur5, D. Hurtmans5, H. Claude6, H. Dier7, B. Johnson8, H. Kelder9, R. Kivi10, T. Koide11, M. López Bartolomé12, K. Lambkin13, D. Moore14, F. J. Schmidlin15, and R. Stübi16
1Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA), CNRS/Univ. Paris 12 et 7, Créteil, France
2Institut für Meteorologie und Klimaforschung, Forschungszentrum Karlsruhe, Germany
3UPMC Univ. Paris 06, CNRS UMR8190, LATMOS/IPSL, Paris, France
4Laboratoire de Physique Moléculaire pour l'Atmosphére et l'Astrophysique, Université Pierre et Marie Curie-Paris 6, Paris, France
5Spectroscopie de l'Atmosphère, Service de Chimie Quantique et de Photophysique, Université Libre de Bruxelles (U.L.B.), Brussels, Belgium
6Meteorological Observatory Hohenpeißenberg, DWD, Hohenpeißenberg, Germany
7Richard-Aßmann-Observatorium, DWD, Lindenberg, Germany
8NOAA/ESRL, Boulder, CO, USA
9Department of Applied Physics, Eindhoven University of Technology, Eindhoven, The Netherlands
10Finnish Meteorological Institute, Sodankylä, Finland
11Ozone Layer Monitoring Office, Japan Meteorological Agency, Tokyo 100-8122, Japan
12Agencia Estatal de Meteorología (AEMET), Madrid, Spain
13Met Éireann, The Irish Meteorological Service, Valentia Observatory, Cahirciveen, Kerry, Ireland
14Met Office, Exeter, UK
15NASA Goddard Space Flight Center, Wallops Flight Facility, Wallops Island, USA
16Federal Office of Meteorology and Climatology, MeteoSwiss, Aerological Station, Payerne, Switzerland
*now at: Astrium GmbH, Germany

Abstract. This paper presents a first statistical validation of tropospheric ozone products derived from measurements of the satellite instrument IASI. Since end of 2006, IASI (Infrared Atmospheric Sounding Interferometer) aboard the polar orbiter Metop-A measures infrared spectra of the Earth's atmosphere in nadir geometry. This validation covers the northern mid-latitudes and the period from July 2007 to August 2008. The comparison of the ozone products with the vertical ozone concentration profiles from balloon sondes leads to estimates of the systematic and random errors in the IASI ozone products. The intercomparison of the retrieval results from four different sources (including the EUMETSAT ozone products) shows systematic differences due to the used methods and algorithms. On average the tropospheric columns have a small bias of less than 2 Dobson Units (DU) when compared to the sonde measured columns. The comparison of the still pre-operational EUMETSAT columns shows higher mean differences of about 5 DU.

Citation: Keim, C., Eremenko, M., Orphal, J., Dufour, G., Flaud, J.-M., Höpfner, M., Boynard, A., Clerbaux, C., Payan, S., Coheur, P.-F., Hurtmans, D., Claude, H., Dier, H., Johnson, B., Kelder, H., Kivi, R., Koide, T., López Bartolomé, M., Lambkin, K., Moore, D., Schmidlin, F. J., and Stübi, R.: Tropospheric ozone from IASI: comparison of different inversion algorithms and validation with ozone sondes in the northern middle latitudes, Atmos. Chem. Phys. Discuss., 9, 11441-11479, doi:10.5194/acpd-9-11441-2009, 2009.
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