Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 7 5 2007 10.5194/acpd-7-12959-2007 http://www.atmos-chem-phys-discuss.net/7/12959/2007/ http://www.atmos-chem-phys-discuss.net/7/12959/2007/acpd-7-12959-2007.html http://www.atmos-chem-phys-discuss.net/7/12959/2007/acpd-7-12959-2007.pdf 12959 12999 2007-09-05 Observations of iodine monoxide (IO) columns from satellite A. Schönhardt schoenhardt@iup.physik.uni-bremen.de A. Richter F. Wittrock H. Kirk H. Oetjen H. K. Roscoe J. P. Burrows Institute of Environmental Physics, University of Bremen, Otto-Hahn-Allee 1, 28359 Bremen, Germany British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 0ET, UK now at: School of Chemistry, University of Leeds, Leeds, LS2 9JT, UK Iodine species in the troposphere are linked to ozone depletion and new particle formation. In this study, a full year of iodine monoxide (IO) columns retrieved from measurements of the SCIAMACHY satellite instrument is presented, alongside a discussion of their uncertainties and the detection limit. The largest amounts of IO are found near springtime Antarctica, where ground-based measurements have positively detected iodine compounds before. A seasonal variation of iodine monoxide in Antarctica is revealed with high values in springtime, slightly less IO in the summer period and again larger amounts in autumn. In winter, no elevated IO levels are found in the areas accessible to satellite measurements. This seasonal cycle is in good agreement with recent ground-based measurements in Antarctica. In the Arctic region, no elevated IO levels were found in the whole time period analysed, arguing for different conditions existing in the two Polar Regions. 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