Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 9 5 2009 10.5194/acpd-9-20407-2009 http://www.atmos-chem-phys-discuss.net/9/20407/2009/ http://www.atmos-chem-phys-discuss.net/9/20407/2009/acpd-9-20407-2009.html http://www.atmos-chem-phys-discuss.net/9/20407/2009/acpd-9-20407-2009.pdf 20407 20428 2009-09-30 Satellite observations of long range transport of a large BrO cloud in the Arctic M. Begoin begoin@iup.physik.uni-bremen.de A. Richter L. Kaleschke X. Tian-Kunze A. Stohl J. P. Burrows Institute of Environmental Physics, University of Bremen, Bremen, Germany Institute of Oceanography, University of Hamburg, Hamburg, Germany Norwegian Institute for Air Research, Kjeller, Norway Centre for Ecology and Hydrology, Wallingford (Oxfordshire), UK Ozone Depletion Events (ODE) during polar springtime are a well known phenomenon in the Arctic and Antarctic boundary layer. They are caused by the catalytic destruction of ozone by halogens producing reactive halogen oxides like bromine monoxide (BrO). The key halogen bromine can be rapidly transferred into the gas phase in an autocatalytic process – the so called "Bromine Explosion". However, the exact mechanism, which leads to an initial bromine release as well as the influence of transport and chemical processes on BrO, is still not clearly understood. In this study, BrO measurements from the satellite instrument GOME-2 are used together with model calculations with the dispersion model FLEXPART and Potential Frost Flowers (PFF) maps to study a special arctic BrO event in March/April 2007, which could be tracked over many days and large areas. Full BrO activation was observed within one day east of Siberia with subsequent transport to the Hudson Bay. 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