References

ACP

Atmospheric Chemistry and Physics

ACP

Atmos. Chem. Phys.

1680-7324

Copernicus Publications

Göttingen, Germany

10.5194/acp-9-4439-2009

Spatio-temporal observations of the tertiary ozone maximum

Sofieva

V. F.

¹ Kyrölä

¹ Verronen

P. T.

¹ Seppälä

¹ Tamminen

¹ Marsh

D. R.

² Smith

A. K.

² Bertaux

J.-L.

³ Hauchecorne

³ Dalaudier

³ Fussen

⁴ Vanhellemont

⁴ Fanton d'Andon

⁵ Barrot

⁵ Guirlet

⁵ Fehr

⁶ Saavedra

⁶

Earth observation, Finnish Meteorological Institute, Helsinki, Finland

Atmospheric Chemistry Division, National Center for Atmospheric Research, Boulder, Colorado, USA

LATMOS, Université Versailles Saint-Quentin, CNRS/INSU, Verrières-le-Buisson, France

Institut d'Aeronomie Spatiale de Belgique, Brussels, Belgium

ACRI-ST, Sophia-Antipolis, France

European Space Research Institute, European Space Agency, Frascati, Italy

09 07 2009

9 13 4439 4445

2009

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We present spatio-temporal distributions of the tertiary ozone maximum (TOM), based on GOMOS (Global Ozone Monitoring by Occultation of Stars) ozone measurements in 2002–2006. The tertiary ozone maximum is typically observed in the high-latitude winter mesosphere at an altitude of ~72 km. Although the explanation for this phenomenon has been found recently – low concentrations of odd-hydrogen cause the subsequent decrease in odd-oxygen losses – models have had significant deviations from existing observations until recently. Good coverage of polar night regions by GOMOS data has allowed for the first time to obtain spatial and temporal observational distributions of night-time ozone mixing ratio in the mesosphere. The distributions obtained from GOMOS data have specific features, which are variable from year to year. In particular, due to a long lifetime of ozone in polar night conditions, the downward transport of polar air by the meridional circulation is clearly observed in the tertiary ozone maximum time series. Although the maximum tertiary ozone mixing ratio is achieved close to the polar night terminator (as predicted by the theory), TOM can be observed also at very high latitudes, not only in the beginning and at the end, but also in the middle of winter. We have compared the observational spatio-temporal distributions of the tertiary ozone maximum with that obtained using WACCM (Whole Atmosphere Community Climate Model) and found that the specific features are reproduced satisfactorily by the model. Since ozone in the mesosphere is very sensitive to HOx concentrations, energetic particle precipitation can significantly modify the shape of the ozone profiles. In particular, GOMOS observations have shown that the tertiary ozone maximum was temporarily destroyed during the January 2005 and December 2006 solar proton events as a result of the HOx enhancement from the increased ionization.

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