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Response of tropical stratospheric ozone and NO2 profiles to the equatorial quasi biennial oscillation as seen from GOMOS on board ENVISAT

Alain Hauchecorne(1), Jean-Loup Bertaux(1), Francis Dalaudier(1), Philippe Keckhut(1), Perrine Lemennais(1), Slimane Bekki(1), Marion Marchand(1), Erkki Kyrölä(2), Johanna Tamminen(2), Viktoria Sofieva(2), Didier Fussen(3), Filip Vanhellemont(3), Odile Fanton d'Andon(4), Gilbert Barrot(4), Thorsten Fehr(5) and Lidia Saavedra de Miguel(6)

(1) CNRS, BP3, 91370 Verrières-le-Buisson, France
(2) FMI, , Helsinki, Finland
(3) IASB/BIRA, , Brussels, Belgium
(4) ACRI-ST, , Sophia-Antopolis, France
(5) ESA, Via Galileo Galilei, 00044 Frascati, Italy
(6) Serco, , Frascati, Italy

Abstract

The stellar occultation spectrometer GOMOS (Global Ozone Monitoring by Occultation of Stars) on ESA’s Envisat-satellite measures vertical profiles O3, NO2 and NO3 with a high long-term stability due to the self-calibrating nature of the technique. The interannual variability of O3 is assumed to be much smaller in the tropical region (about 3% in total column) than at mid and high latitudes where extra-tropical planetary waves perturb the zonal circulation. However we will show in this presentation, using 6 years of GOMOS data, that the intertropical ozone and NO2 profiles exhibit a strong interannual variability in the stratosphere strongly correlated with the equatorial Quasi-Biennial Oscillation (QBO) of the zonal wind. Photochemical and dynamical mechanisms responsible for this correlation will be presented. Preliminary results on the equatorial ozone trend during this period will be also shown and the possible link with changes in solar activity will be discussed.

 

Workshop presentation