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Fractional release factors (FRFs) of organic trace gases aretime-independent quantities that influence the calculation of Global WarmingPotentials and Ozone Depletion Potentials. We present the first set ofvertically resolved FRFs for 15 long-lived halocarbons in the tropicalstratosphere up to 34 km altitude. They were calculated from measurements onair samples collected on board balloons and a high altitude aircraft. Wecompare the derived dependencies of FRFs on the mean stratospheric transittimes (the so-called mean ages of air) with similarly derived FRFsoriginating from measurements at higher latitudes and find significantdifferences. Moreover a comparison with averaged FRFs currently used by theWorld Meteorological Organisation revealed the limitations of these measuresdue to their observed vertical and latitudinal variability. The presenteddata set could be used to improve future ozone level and climateprojections

Fractional release factors of long-lived halogenated organic compounds in the tropical stratosphere