title: Chlorine isotope fractionation in the stratosphere.
abstract: Chlorinated organic compounds are important contributors to the anthropogenic enhancement of stratospheric ozone depletion. We report measurements of stratospheric isotope fractionation in such a compound. Stratospheric and tropospheric difluorodichloromethane (CF2Cl2) were found to have the largest relative 37Cl/35Cl isotope ratio difference ever measured for a natural compound. The increase of the relative isotope ratio difference with altitude was tightly correlated to the corresponding decrease in the CF2Cl2 mixing ratio. The observed relationship has a high potential to provide new insights into atmospheric chemistry and transport processes.
authors.affiliation: School of Environmental Sciences, University of East Anglia, Norwich NR47TJ, UK. j.laube@uea.ac.uk
authors.forename: J C
authors.initials: JC
authors.lastname: Laube
authors.forename: J
authors.initials: J
authors.lastname: Kaiser
authors.forename: W T
authors.initials: WT
authors.lastname: Sturges
authors.forename: H
authors.initials: H
authors.lastname: Bönisch
authors.forename: A
authors.initials: A
authors.lastname: Engel