Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 9 5 2009 10.5194/acpd-9-20283-2009 http://www.atmos-chem-phys-discuss.net/9/20283/2009/ http://www.atmos-chem-phys-discuss.net/9/20283/2009/acpd-9-20283-2009.html http://www.atmos-chem-phys-discuss.net/9/20283/2009/acpd-9-20283-2009.pdf 20283 20307 2009-09-28 Fractional release factors of long-lived halogenated organic compounds in the tropical stratosphere J. C. Laube j.laube@uea.ac.uk A. Engel H. Bönisch T. Möbius W. T. Sturges M. Braß T. Röckmann Institute for Atmospheric and Environmental Sciences, University of Frankfurt, Germany School of Environmental Sciences, University of East Anglia, UK Institute for Marine and Atmospheric Research, Utrecht University, The Netherlands Fractional release factors (FRFs) of organic trace gases are time-independent quantities that influence the calculation of Global Warming Potentials and Ozone Depletion Potentials. We present the first set of vertically resolved FRFs for 15 long-lived halocarbons in the tropical stratosphere up to 34 km altitude. They were calculated from measurements on air samples collected on board balloons and a high altitude aircraft. We compare the derived dependencies of FRFs on the mean stratospheric transit times (the so-called mean ages of air) with similarly derived FRFs originating from measurements at higher latitudes and find significant differences. Moreover a comparison with averaged FRFs currently used by the World Meteorological Organisation revealed the latter to be imprecise measures due to their observed vertical and latitudinal variability. The presented data set could thus be used to improve future ozone level and climate projections. 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