Atmos. Chem. Phys. Discuss., 10, 7675-7697, 2010
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Rapid growth of HFC-227ea (1,1,1,2,3,3,3-Heptafluoropropane) in the atmosphere
J. C. Laube1, P. Martinerie2, E. Witrant3, T. Blunier4, J. Schwander5, C. A. M. Brenninkmeijer6, T. J. Schuck6, M. Bolder7, T. Röckmann7, C. van der Veen7, H. Bönisch8, A. Engel8, G. P. Mills1, M. J. Newland1, D. E. Oram1, C. E. Reeves1, and W. T. Sturges1
1School of Environmental Sciences, University of East Anglia, Norwich, UK
2Laboratoire de Glaciologie et Géophysique de l'Environnement (LGGE), CNRS, Université Joseph Fourier-Grenoble, Grenoble, France
3Grenoble Image Parole Signal Automatique (GIPSA-lab), Université Joseph Fourier/CNRS, Grenoble, France
4Centre for Ice and Climate, University of Copenhagen, Copenhagen, Denmark
5Physics Institute, University of Berne, Bern, Switzerland
6Max Planck Institute for Chemistry, Air Chemistry Division, Mainz, Germany
7Institute for Marine and Atmospheric Research, Utrecht University, Utrecht, The Netherlands
8Institute for Atmosphere and Environment, University of Frankfurt, Frankfurt, Germany

Abstract. We report the first measurements of 1,1,1,2,3,3,3-heptafluoropropane (HFC-227ea), a substitute for ozone depleting compounds, in remote regions of the atmosphere and present evidence for its rapid growth. Observed mixing ratios ranged from below 0.01 ppt in deep firn air to 0.59 ppt in the northern mid-latitudinal upper troposphere. Firn air samples collected in Greenland were used to reconstruct a history of atmospheric abundance. Year-on-year increases were deduced, with acceleration in the growth rate from 0.026 ppt per year in 2000 to 0.057 ppt per year in 2007. Upper tropospheric air samples provide evidence for a continuing growth until late 2009. Furthermore we calculated a stratospheric lifetime of 370 years from measurements of air samples collected on board high altitude aircraft and balloons. Emission estimates were determined from the reconstructed atmospheric trend and suggest that current "bottom-up" estimates of global emissions for 2005 are too high by more than a factor of three.

Citation: Laube, J. C., Martinerie, P., Witrant, E., Blunier, T., Schwander, J., Brenninkmeijer, C. A. M., Schuck, T. J., Bolder, M., Röckmann, T., van der Veen, C., Bönisch, H., Engel, A., Mills, G. P., Newland, M. J., Oram, D. E., Reeves, C. E., and Sturges, W. T.: Rapid growth of HFC-227ea (1,1,1,2,3,3,3-Heptafluoropropane) in the atmosphere, Atmos. Chem. Phys. Discuss., 10, 7675-7697, doi:10.5194/acpd-10-7675-2010, 2010.
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