Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 9 6 2009 10.5194/acpd-9-25361-2009 http://www.atmos-chem-phys-discuss.net/9/25361/2009/ http://www.atmos-chem-phys-discuss.net/9/25361/2009/acpd-9-25361-2009.html http://www.atmos-chem-phys-discuss.net/9/25361/2009/acpd-9-25361-2009.pdf 25361 25407 2009-11-26 Iodine monoxide in the Antarctic snowpack U. Frieß udo.friess@iup.uni-heidelberg.de T. Deutschmann B. Gilfedder R. Weller U. Platt Institute of Environmental Physics, University of Heidelberg, Heidelberg, Germany Institut für Umweltgeologie, TU-Braunschweig, Germany Alfred Wegener Institut für Polar- und Meeresforschung, Bremerhaven, Germany Recent ground-based and space borne observations suggest the presence of significant amounts of iodine monoxide in the boundary layer of Antarctica, which are expected to have an impact on the ozone budget and might contribute to the formation of new airborne particles. So far, the source of these iodine radicals has been unknown. This paper presents long-term measurements of iodine monoxide at the German Antarctic research station Neumayer, which indicate that the snowpack is the main source for iodine radicals. The measurements have been performed using multi-axis differential optical absorption spectroscopy (MAX-DOAS). Using a coupled atmosphere-snowpack radiative transfer model, the comparison of the signals observed from scattered skylight and from light reflected by the snowpack yields several ppb of iodine monoxide in the upper layers of the sunlit snowpack throughout the year. Snow pit samples from Neumayer Station contain up to 700 ng/l of total iodine, representing a sufficient reservoir for these extraordinarily high IO concentrations. Aldahan, A., Persson, S., Possnert, G., and Hou, X L.: Distribution of $^127$I and $^129$I in precipitation at high European latitudes, Geophys. Res. Lett., 36, L11805, \doi10.1029/2009GL037363, 2009. 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