ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-10-8873-2010 Response of tropical stratospheric O<sub>3</sub>, NO<sub>2</sub> and NO<sub>3</sub> to the equatorial Quasi-Biennial Oscillation and to temperature as seen from GOMOS/ENVISAT Hauchecorne A. 1 Bertaux J. L. 1 Dalaudier F. 1 Keckhut P. 1 Lemennais P. 1 Bekki S. 1 Marchand M. 1 Lebrun J. C. 1 Kyrölä E. 2 Tamminen J. 2 Sofieva V. 2 Fussen D. 3 Vanhellemont F. 3 Fanton d'Andon O. 4 Barrot G. 4 Blanot L. 4 Fehr T. 5 Saavedra de Miguel L. 6 LATMOS/IPSL, UVSQ, CNRS-INSU, Guyancourt, France Finnish Meteorological Institute, Earth Observation, Helsinki, Finland Institut d'Aéronomie Spatiale de Belgique, Brussels, Belgium ACRI-ST, Sophia-Antopolis, France ESA, Frascati, Italy Serco, Frascati, Italy 20 09 2010 10 18 8873 8879 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys.net/10/8873/2010/acp-10-8873-2010.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/10/8873/2010/acp-10-8873-2010.pdf

The stellar occultation spectrometer GOMOS (Global Ozone Monitoring by Occultation of Stars) on ESA's Envisat satellite measures vertical profiles O<sub>3</sub>, NO<sub>2</sub> and NO<sub>3</sub> with a high long-term stability due to the self-calibrating nature of the technique. More than 6 years of GOMOS data from August 2002 to end 2008 have been analysed to study the inter-annual variation of O<sub>3</sub>, NO<sub>2</sub> and NO<sub>3</sub> in the tropics. It is shown that the QBO of the equatorial wind induces variations in the local concentration larger than 10% for O<sub>3</sub> and larger than 25% for NO<sub>2</sub>. <br><br> Quasi-Biennial Oscillation signals can be found in the evolution of the three constituents up to at least 40 km. We found that NO<sub>3</sub> is positively correlated with temperature up to 45 km in the region where it is in chemical equilibrium with O<sub>3</sub>. Our results confirm the existence of a transition from a dynamical control of O<sub>3</sub> below 28 km with O<sub>3</sub> correlated with temperature and a chemical/temperature control between 28 and 38 km with O<sub>3</sub> anti-correlated with NO<sub>2</sub> and temperature. Above 38 km and up to 50 km a different regime is found with O<sub>3</sub> and NO<sub>2</sub> correlated with each other and anti-correlated with temperature. For the NO<sub>2</sub>/temperature anti-correlation in the upper stratosphere, our proposed explanation is the modulation of the N<sub>2</sub>O ascent by the QBO up to 45 km. The oxidation of N<sub>2</sub>O is the main source of NO<sub>y</sub> in this altitude region. An enhancement of the ascending motion will cool adiabatically the atmosphere and will increase the amount of N<sub>2</sub>O concentration available for NO<sub>y</sub> formation.

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