References

ACPD

Atmospheric Chemistry and Physics Discussions

ACPD

1680-7375

Copernicus GmbH

Göttingen, Germany

10.5194/acpd-8-727-2008

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

Jégou

¹ Urban

² de La Noë

³ Ricaud

⁴ Le Flochmoën

⁴ Murtagh

D. P.

² Eriksson

² Jones

² Petelina

⁵ ¹⁴ Llewellyn

E. J.

⁵ Lloyd

N. D.

⁵ Haley

⁶ Lumpe

⁷ Randall

⁸ Bevilacqua

R. M.

⁹ Catoire

¹⁰ Huret

¹⁰ Berthet

¹⁰ Renard

J. B.

¹⁰ Strong

¹¹ Davies

¹² Mc Elroy

C. T.

¹² Goutail

¹³ Pommereau

J. P.

¹³

Laboratoire des Sciences du Climat et de l'Environnement, Gif sur Yvette, France

Chalmers University of Technology, Göteborg, Sweden

Université Bordeaux 1, CNRS/INSU, Laboratoire d'Astrophysique de Bordeaux, Floirac, France

Laboratoire d'Aérologie, Toulouse, France

University of Saskatchewan, Saskatoon, Canada

York University, Toronto, Canada

Computational Physics, Inc., Boulder, Colorado, USA

Laboratory for Atmospheric and Space Physics, Univ. of Colorado, Boulder, Colorado, USA

Naval Research Laboratory, Washington, D.C., USA

Laboratoire de Physique et de Chimie de l'Environnement, Orléans, France

Department of Physics, University of Toronto, Toronto, Canada

Environment Canada, Toronto, Canada

Service d’Aéronomie, Paris, France

La Trobe University, Victoria, Australia

11 01 2008

8 1 727 779

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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 x in 10° 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.

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