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

Details Stratospheric CO2 isotopic anomalies and SF6 and CFC tracer concentrations in the Arctic polar vortex Stratospheric CO2 isotopic anomalies and SF6 and CFC tracer concentrations in the Arctic polar vortex

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.4103a&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 21, p. 4103-4106

Physics

8

Atmospheric Composition And Structure: Middle Atmosphere-Composition And Chemistry, Geochemistry: Isotopic Composition/Chemistry, Meteorology And Atmospheric Dynamics: Middle Atmosphere Dynamics, Meteorology And Atmospheric Dynamics: Stratosphere/Troposphere Interactions

Scientific paper

Isotopic measurements (δ17O and δ18O) of CO2 along with concentration measurements of SF6, CCl3F (CFC-11), CCl2F2 (CFC-12) and CCl2FCClF2 (CFC-113) in stratospheric samples collected within the Arctic polar vortex are reported. These are the first simultaneous measurements of the 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 isotopic exchange with stratospheric O(1D) derived from O3 photolysis. The data exhibit a strong anti-correlation between the Δ17O (the degree of the mass-independent anomaly) and molecular tracer concentrations. The potential ability of this isotopic proxy to trace mesospheric and stratospheric transport is discussed.

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