Quantification of the SF6 lifetime based on mesospheric loss measured in the stratospheric polar vortex
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Quantification of the SF6 lifetime based on mesospheric loss measured in the stratospheric polar vortex
  • Published Date:

    2017

  • Source:
    Journal of Geophysical Research-Atmospheres, 122(8), 4626-4638.
Filetype[PDF-1.21 MB]


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  • Description:
    Sulfur hexafluoride (SF6) is a greenhouse gas with one of the highest radiative efficiencies in the atmosphere as well as an important indicator of transport time scales in the stratosphere. The current widely used estimate of the atmospheric lifetime of SF6 is 3200years. In this study we use in situ measurements in the 2000 Arctic polar vortex that sampled air with up to 50% SF6 loss to calculate an SF6 lifetime. Comparison of these measurements with output from the Whole Atmosphere Community Climate Model (WACCM) shows that WACCM transport into the vortex is accurate and that an important SF6 loss mechanism, believed to be electron attachment, is missing in the model. Based on the measurements and estimates of the size of the vortex, we calculate an SF6 lifetime of 850years with an uncertainty range of 580-1400years. The amount of SF6 loss is shown to be consistent with that of HFC-227ea, which has a lifetime of 670-780years, adding independent support to our new SF6 lifetime estimate. Based on the revised lifetime the global warming potential of SF6 will decrease only slightly for short time horizons (<100years) but will decrease substantially for time horizons longer than 2000years. Also, the use of SF6 measurements as an indicator of transport time scales in the stratosphere clearly must account for potential influence from polar vortex air.
  • DOI:
    http://dx.doi.org/10.1002/2016jd026198
  • Document Type:
    Journal Article
  • Collection(s):
    NOAA Cooperative Institutes
    Office of Oceanic and Atmospheric Research (OAR)
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