ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-10-5903-2010 Accelerating growth of HFC-227ea (1,1,1,2,3,3,3-heptafluoropropane) in the atmosphere Laube J. C. 1 Martinerie P. 2 Witrant E. 3 Blunier T. 4 Schwander J. 5 Brenninkmeijer C. A. M. 6 Schuck T. J. 6 Bolder M. 7 Röckmann T. 7 van der Veen C. 7 Bönisch H. 8 Engel A. 8 Mills G. P. 1 Newland M. J. 1 Oram D. E. 1 Reeves C. E. 1 Sturges W. T. 1 School of Environmental Sciences, University of East Anglia, Norwich, UK Laboratoire de Glaciologie et Géophysique de l'Environnement (LGGE), CNRS, Université Joseph Fourier-Grenoble, Grenoble, France Grenoble Image Parole Signal Automatique (GIPSA-lab), Université Joseph Fourier/CNRS, Grenoble, France Centre for Ice and Climate, University of Copenhagen, Copenhagen, Denmark Physics Institute, University of Berne, Bern, Switzerland Max Planck Institute for Chemistry, Air Chemistry Division, Mainz, Germany Institute for Marine and Atmospheric Research, Utrecht University, Utrecht, The Netherlands Institute for Atmosphere and Environment, University of Frankfurt, Frankfurt, Germany 02 07 2010 10 13 5903 5910 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys.net/10/5903/2010/acp-10-5903-2010.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/10/5903/2010/acp-10-5903-2010.pdf

We report the first measurements of 1,1,1,2,3,3,3-heptafluoropropane (HFC-227ea), a substitute for ozone depleting compounds, in air samples originating from remote regions of the atmosphere and present evidence for its accelerating growth. Observed mixing ratios ranged from below 0.01 ppt in deep firn air to 0.59 ppt in the current 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 0.029 ppt per year in 2000 to 0.056 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 a factor of three.

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