Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 8 4 2008 10.5194/acpd-8-12595-2008 http://www.atmos-chem-phys-discuss.net/8/12595/2008/ http://www.atmos-chem-phys-discuss.net/8/12595/2008/acpd-8-12595-2008.html http://www.atmos-chem-phys-discuss.net/8/12595/2008/acpd-8-12595-2008.pdf 12595 12624 2008-07-02 The role of ice in N₂O₅ heterogeneous hydrolysis at high latitudes R. L. Apodaca D. M. Huff W. R. Simpson Department of Chemistry and Biochemistry and Geophysical Institute, University of Alaska Fairbanks, Fairbanks, AK, 99775-6160, USA We report evidence for ice catalyzing N₂O₅ heterogeneous hydrolysis from a study conducted near Fairbanks, AK in November 2007. Mixing ratios of N₂O₅, NO, NO₂, and ozone are reported and are used to determine steady state N₂O₅ lifetimes. 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