Atmospheric lifetime of SF5CF3

Details Atmospheric lifetime of SF5CF3 Atmospheric lifetime of SF5CF3

Aug 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29o...7t&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 15, pp. 7-1, CiteID 1712, DOI 10.1029/2002GL015356

Physics

3

Atmospheric Composition And Structure: Middle Atmosphere-Constituent Transport And Chemistry (3334), Global Change: Atmosphere (0315, 0325), Atmospheric Composition And Structure: Chemical Kinetic And Photochemical Properties

Scientific paper

The vacuum ultraviolet (VUV) absorption spectrum of SF5CF3 was measured over the range 106-200 nm. At 121.6 nm, σ(base e) = (7.8 +/- 0.6) × 10-18 cm2 molecule-1, in which quoted uncertainty includes two standard deviation from the least-square fit in the Beer-Lambert plot and our estimate of potential systematic errors associated with measurements of the reactant concentrations. The VUV spectrum and literature data for electron attachment and ion-molecule reactions were incorporated into a model of the stratosphere, mesosphere, and lower thermosphere. This information provides better constraints on the atmospheric lifetime and hence on the potential of this highly radiatively-active trace gas to influence the climate system. The atmospheric lifetime of SF5CF3 is dominated by dissociative electron attachment and is estimated to be approximately 950 years. Solar proton events could reduce this to a lower limit of 650 years.

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