THE VARIATION OF AVAILABLE CHLORINE, CLY, IN THE ARCTIC POLAR VORTEX DURING EASOE

Whole air samplers were flown on large balloons that were launched fro m Kiruna (67.9-degrees-N, 21.1-degrees-E) in the period from 30 Novemb er 1991 until 20 March 1992 during EASOE. Thirteen vertical profiles o f the CCl2F2 mixing ratio were obtained from the analyses of stratosph eric air samples that were collected at altitudes between about 10 and 31 km. An empirical correlation function derived from simultaneous pr ofile observations of CCl2F2 and the five other most abundant organic chlorine species was used to determine the vertical distribution of to tal organic chlorine (SIGMA Cl(org)) for each flight. These profiles a llowed to estimate vertical profiles of the mixing ratio of total avai lable chlorine, Cl(y), and the temporal variation of its column abunda nce.