TY  - JOUR
A1  - Laube, Johannes Christian
A1  - Martinerie, Patricia
A1  - Witrant, Emmanuel
A1  - Blunier, Thomas
A1  - Schwander, Jakob
A1  - Brenninkmeijer, Carl
A1  - Schuck, Tanja J.
A1  - Bolder, Michel
A1  - Röckmann, Thomas
A1  - Veen, Cornelis J. van der
A1  - Bönisch, Harald
A1  - Engel, Andreas
A1  - Mills, Graham
A1  - Newland, Mike J.
A1  - Oram, David
A1  - Reeves, Claire E.
A1  - Sturges, William T.
T1  - Accelerating growth of HFC-227ea (1,1,1,2,3,3,3-heptafluoropropane) in the atmosphere
T2  - Atmospheric chemistry and physics
N2  - 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.
Y1  - 2010
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/7926
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30-78845
UR  - http://www.atmos-chem-phys.net/10/5903/2010
SN  - 1680-7324
SN  - 1680-7316
N1  - © Author(s) 2010. CC Attribution 3.0 License.
VL  - 10
IS  - 13
SP  - 5903
EP  - 5910
PB  - European Geosciences Union
CY  - Katlenburg-Lindau
ER  -