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| Titel |
Reconstructing the atmospheric concentration and emissions of CF4, C2F6 and C3F8 prior to direct atmospheric measurements, using air from polar firn and ice |
| VerfasserIn |
Cathy Trudinger, David Etheridge, William Sturges, Martin Vollmer, Benjamin Miller, David Worton, Matt Rigby, Paul Krummel, Patricia Martinerie, Emmanuel Witrant, Peter Rayner, Mark Battle, Thomas Blunier, Paul Fraser, Johannes Laube, Frances Mani, Jens Muhle, Simon O'Doherty, Jakob Schwander, Paul Steele |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250109609
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| Publikation (Nr.) |
 EGU/EGU2015-9532.pdf |
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| Zusammenfassung |
| Perfluorocarbons are very potent and long-lived greenhouse gases in the atmosphere, released
predominantly during aluminium production, electronic chip manufacture and refrigeration.
Mühle et al.Â(2010) presented records of the concentration and inferred emissions of CF4
(PFC-14), C2F6 (PFC-116) and C3F8 (PFC-218) from the 1970s up to 2008, using
measurements from the Cape Grim Air Archive and a suite of tanks with old Northern
Hemisphere air, and the AGAGE in situ network. Mühle et al.Â(2010) also estimated
pre-industrial concentrations of these compounds from a small number of polar firn and ice
core samples.
Here we present measurements of air from polar firn at four sites (DSSW20K, EDML,
NEEM and South Pole) and from air bubbles trapped in ice at two sites (DE08 and DE08-2),
along with recent atmospheric measurements to give a continuous record of concentration
from preindustrial levels up to the present. We estimate global emissions (with uncertainties)
consistent with the concentration records. The uncertainty analysis takes into account
uncertainties in characterisation of the age of air in firn and ice by the use of two
different (independently-calibrated) firn models (the CSIRO and LGGE-GIPSA firn
models).
References
Mühle, J., A.L. Ganesan, B.R. Miller, P.K. Salameh, C.M. Harth, B.R. Greally, M. Rigby,
L.W. Porter, L. P. Steele, C.M. Trudinger, P.B. Krummel, S. O’Doherty, P.J. Fraser, P.G.
Simmonds, R.G. Prinn, and R.F. Weiss, Perfluorocarbons in the global atmosphere:
tetrafluoromethane, hexafluoroethane, and octafluoropropane, Atmos. Chem. Phys., 10,
5145–5164, doi:10.5194/acp–10–5145–2010, 2010. |
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