Accelerating growth of HFC-227ea (1,1,1,2,3,3,3-heptafluoropropane) in the atmosphere

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 
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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Author:Johannes Christian Laube, Patricia Martinerie, Emmanuel Witrant, Thomas Blunier, Jakob Schwander, Carl Brenninkmeijer, Tanja J. Schuck, Michel Bolder, Thomas Röckmann, Cornelis J. van der Veen, Harald Bönisch, Andreas Engel, Graham Mills, Mike J. Newland, David Oram, Claire E. Reeves, William T. Sturges
URN:urn:nbn:de:hebis:30-78845
URL:http://www.atmos-chem-phys.net/10/5903/2010
DOI:http://dx.doi.org/10.5194/acp-10-5903-2010
ISSN:1680-7324
ISSN:1680-7316
Parent Title (English):Atmospheric chemistry and physics
Publisher:European Geosciences Union
Place of publication:Katlenburg-Lindau
Contributor(s):R. MacKenzie
Document Type:Article
Language:English
Date of Publication (online):2010/09/03
Date of first Publication:2010/07/02
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2010/09/03
Volume:10
Issue:13
Pagenumber:8
First Page:5903
Last Page:5910
Note:
© Author(s) 2010. CC Attribution 3.0 License.
HeBIS PPN:227364422
Institutes:Geowissenschaften
Dewey Decimal Classification:550 Geowissenschaften
Sammlungen:Universitätspublikationen
Licence (German):License LogoCreative Commons - Namensnennung 3.0

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