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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
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Volume 8, issue 13 | Copyright
Atmos. Chem. Phys., 8, 3385-3409, 2008
https://doi.org/10.5194/acp-8-3385-2008
© Author(s) 2008. This work is distributed under
the Creative Commons Attribution 3.0 License.

  30 Jun 2008

30 Jun 2008

Technical Note: Validation of Odin/SMR limb observations of ozone, comparisons with OSIRIS, POAM III, ground-based and balloon-borne instruments

F. Jégou1, J. Urban2, J. de La Noë3, P. Ricaud4, E. Le Flochmoën4, D. P. Murtagh2, P. Eriksson2, A. Jones2, S. Petelina5,14, E. J. Llewellyn5, N. D. Lloyd5, C. Haley6, J. Lumpe7, C. Randall8, R. M. Bevilacqua9, V. Catoire10, N. Huret10, G. Berthet10, J. B. Renard10, K. Strong11, J. Davies12, C. T. Mc Elroy12, F. Goutail13, and J. P. Pommereau13 F. Jégou et al.
  • 1Laboratoire des Sciences du Climat et de l'Environnement, Gif sur Yvette, France
  • 2Chalmers University of Technology, Göteborg, Sweden
  • 3Université Bordeaux 1, CNRS/INSU, Laboratoire d'Astrophysique de Bordeaux, Floirac, France
  • 4Laboratoire d'Aérologie, Toulouse, France
  • 5University of Saskatchewan, Saskatoon, Canada
  • 6York University, Toronto, Canada
  • 7Computational Physics, Inc., Boulder, Colorado, USA
  • 8Laboratory for Atmospheric and Space Physics, Univ. of Colorado, Boulder, Colorado, USA
  • 9Naval Research Laboratory, Washington, D.C., USA
  • 10Laboratoire de Physique et de Chimie de l'Environnement, Orléans, France
  • 11Department of Physics, University of Toronto, Toronto, Canada
  • 12Environment Canada, Toronto, Canada
  • 13Service d'Aéronomie, Paris, France
  • 14La Trobe University, Victoria, Australia

Abstract. The Odin satellite carries two instruments capable of determining stratospheric ozone profiles by limb sounding: the Sub-Millimetre Radiometer (SMR) and the UV-visible spectrograph of the OSIRIS (Optical Spectrograph and InfraRed Imager System) instrument. A large number of ozone profiles measurements were performed during six years from November 2001 to present. This ozone dataset is here used to make quantitative comparisons with satellite measurements in order to assess the quality of the Odin/SMR ozone measurements. In a first step, we compare Swedish SMR retrievals version 2.1, French SMR ozone retrievals version 222 (both from the 501.8 GHz band), and the OSIRIS retrievals version 3.0, with the operational version 4.0 ozone product from POAM III (Polar Ozone Atmospheric Measurement). In a second step, we refine the Odin/SMR validation by comparisons with ground-based instruments and balloon-borne observations. We use observations carried out within the framework of the Network for Detection of Atmospheric Composition Change (NDACC) and balloon flight missions conducted by the Canadian Space Agency (CSA), the Laboratoire de Physique et de Chimie de l\'{}Environnement (LPCE, Orléans, France), and the Service d'Aéronomie (SA, Paris, France). Coincidence criteria were 5° in latitude×10° in longitude, and 5 h in time in Odin/POAM III comparisons, 12 h in Odin/NDACC comparisons, and 72 h in Odin/balloons comparisons. An agreement is found with the POAM III experiment (10–60 km) within −0.3±0.2 ppmv (bias±standard deviation) for SMR (v222, v2.1) and within −0.5±0.2 ppmv for OSIRIS (v3.0). Odin ozone mixing ratio products are systematically slightly lower than the POAM III data and show an ozone maximum lower by 1–5 km in altitude. The comparisons with the NDACC data (10–34 km for ozonesonde, 10–50 km for lidar, 10–60 for microwave instruments) yield a good agreement within −0.15±0.3 ppmv for the SMR data and −0.3±0.3 ppmv for the OSIRIS data. Finally the comparisons with instruments on large balloons (10–31 km) show a good agreement, within −0.7±1 ppmv. The official SMR v2.1 dataset is consistent in all altitude ranges with POAM III, NDACC and large balloon-borne instruments measurements. In the SMR v2.1 data, no different systematic error has been found in the 0–35km range in comparison with the 35–60 km range. The same feature has been highlighted in both hemispheres in SMR v2.1/POAM III intercomparisons, and no latitudinal dependence has been revealed in SMR v2.1/NDACC intercomparisons.

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