The vertical distribution of CFC-114 (CClF2-CClF2) in the atmosphere

Vertical profiles of CFC-114 obtained by gas chromatographic analyses of stratospheric air samples collected during three balloon flights at Aire sur l'Adour, France (44°N) are presented. Neon-cooled cryogenic samplers of Max-Planck-Institut für Aeronomie were launched on September 20, 1982, September 10, 1983, and October 1, 1984. The average 1982-1984 midlatitude profile of CFC-114 obtained by averaging the results of these flights shows mixing ratios decreasing from 10.5 pptv at 10 km to 2.7 pptv at 35 km. Results obtained with a time-dependent 1-D model based on CFC-114 global emission rates evaluated by Wuebbles (1983) are in good agreement with our measured distribution when Wuebbles' data are scaled by a factor 1.16. The distribution calculated for steady state conditions shows a slower falloff with height in the stratosphere.