Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 7 3 2007 10.5194/acpd-7-8261-2007 http://www.atmos-chem-phys-discuss.net/7/8261/2007/ http://www.atmos-chem-phys-discuss.net/7/8261/2007/acpd-7-8261-2007.html http://www.atmos-chem-phys-discuss.net/7/8261/2007/acpd-7-8261-2007.pdf 8261 8308 2007-06-14 Retrieval of stratospheric and tropospheric BrO columns from multi-axis DOAS measurements at Reunion Island (21° S, 56° E) N. Theys theys@aeronomie.be M. Van Roozendael F. Hendrick C. Fayt C. Hermans J.-L. Baray F. Goutail J.-P. Pommereau M. De Mazière Belgium Institute for Space Aeronomy (IASB-BIRA), Brussels, Belgium Laboratoire de L'Atmosphère et des Cyclones (LACy), UMR-CNRS, St-Denis, La Réunion, France Service d'Aéronomie, Verrières-le-Buisson, France Spectral measurements of BrO using zenith-sky and off-axis viewing geometries are combined in a linear multiple regression retrieval algorithm to provide stratospheric and tropospheric BrO vertical columns. One year of measurement data are investigated over Reunion-Island (20.9° S, 55.5° E), from July 2004 to July 2005. No seasonal variations of the retrieved BrO columns could be observed, in line with previous studies. A comparison between the stratospheric columns retrieved at 45°, 80°, 85°, 87.5° and 92.5° solar zenith angles and photochemical simulations initialized by chemical fields from the 3-D-CTM SLIMCAT and further constrained by observed NO₂ profiles shows a good agreement only by considering a contribution from the very short-lived organic bromine substances to the stratospheric inorganic bromine budget, of 6 to 8 pptv. Furthermore, stratospheric BrO profiles retrieved from late twilight zenith-sky observations are consistent with a total inorganic bromine (Br_y) loading of approximately 23 pptv. This represents 6 to 7 pptv more than can be supplied by long-lived organic bromine sources, and therefore supports an added contribution from very short-lived organic bromine substances as recently suggested in several other studies. 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