Stratospheric CO2 isotopic anomalies and SF6 and CFC tracer concentrationsin the Arctic polar vortex

Isotopic measurements (delta O-17 and delta O-18) Of CO2 along with concent ration measurements of SF6, CC1(3)F (CFC-11), CC1(2)F(2) (CFC-12) and CC1(2 )FCC1F(2) (CFC-113) in stratospheric samples collected within the Arctic po lar vortex are reported. These are the first simultaneous measurements of t he concentration of fluorinated compounds and the complete oxygen isotopic composition Of CO2 in the middle atmosphere. A mass-independent anomaly in the oxygen isotopic composition Of CO2 is observed that arises from isotopi c exchange with stratospheric O(D-1) derived from O-3 photolysis. The data exhibit a strong anti-correlation between the Delta O-17 (the degree of the mass-independent anomaly) and molecular tracer concentrations. The potenti al ability of tl-ris isotopic proxy to trace mesospheric and stratospheric transport is discussed.