Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 9 3 2009 10.5194/acpd-9-12707-2009 http://www.atmos-chem-phys-discuss.net/9/12707/2009/ http://www.atmos-chem-phys-discuss.net/9/12707/2009/acpd-9-12707-2009.html http://www.atmos-chem-phys-discuss.net/9/12707/2009/acpd-9-12707-2009.pdf 12707 12730 2009-06-04 Simultaneous measurements of OClO, NO₂ and O₃ in the Arctic polar vortex by the GOMOS instrument C. Tétard cedric.tetard@aeronomie.be D. Fussen C. Bingen N. Capouillez E. Dekemper N. Loodts N. Mateshvili F. Vanhellemont E. Kyrölä J. Tamminen V. Sofieva A. Hauchecorne F. Dalaudier J.-L. Bertaux O. Fanton d'Andon G. Barrot M. Guirlet T. Fehr L. Saavedra Institut d'Aéronomie Spatiale de Belgique, Brussels, Belgium Finnish Meteorological Institute, Helsinki, Finland Service d'Aéronomie du CNRS, Verrières-le-buisson, France ACRI-ST, Sophia-Antipolis, France European Space Research Institute (ESRIN), European Space Agency, Frascaty, Italy We present the first nighttime measurements of OClO from a limb-viewing satellite instrument in the Arctic polar vortex. The relationship between OClO, NO₂ and O₃ slant column densities in the Arctic polar vortex are analyzed from the GOMOS measurements. The retrieval process is based on a differential optical absorption spectroscopy (DOAS) method applied on the weighted median GOMOS transmittances. A study about the longitudinal distributions of OClO, NO₂ and O₃ above 65° north in January 2008 is presented. It shows a strong halogen activation in the lower stratosphere and a strong denoxification in the entire stratosphere inside the Arctic polar vortex. 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