Atmos. Chem. Phys. Discuss., 9, 20283-20307, 2009
© Author(s) 2009. This work is distributed
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Fractional release factors of long-lived halogenated organic compounds in the tropical stratosphere
J. C. Laube1,2, A. Engel1, H. Bönisch1, T. Möbius1, W. T. Sturges2, M. Braß3, and T. Röckmann3
1Institute for Atmospheric and Environmental Sciences, University of Frankfurt, Germany
2School of Environmental Sciences, University of East Anglia, UK
3Institute for Marine and Atmospheric Research, Utrecht University, The Netherlands

Abstract. 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.

Citation: Laube, J. C., Engel, A., Bönisch, H., Möbius, T., Sturges, W. T., Braß, M., and Röckmann, T.: Fractional release factors of long-lived halogenated organic compounds in the tropical stratosphere, Atmos. Chem. Phys. Discuss., 9, 20283-20307, doi:10.5194/acpd-9-20283-2009, 2009.
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