Laube, J.C. and Hogan, C. and Newland, M.J. and Mani, Francis S. and Fraser, P.J. and Brenninkmeijer, C.A.M. and Martinerie, P. and Oram, D.E. and R, T. and Schwander, J. and Witrant, E. and Mills, G.P. and Reeves, C.E. and Sturges, W.T. (2012) Distributions, long term trends and emissions of four perfluorocarbons in remote parts of the atmosphere and firn air. Atmospheric Chemistry and Physics, 12 . pp. 4081-4090. ISSN 1680-7316
Full text not available from this repository.Abstract
We report the first data set of atmospheric
abundances for the following four perfluoroalkanes:
n-decafluorobutane (n-C4F10), n-dodecafluoropentane
(n-C5F12), n-tetradecafluorohexane (n-C6F14) and nhexadecafluoroheptane(n-C7F16). All four compounds
could be detected and quantified in air samples from remote
locations in the Southern Hemisphere (at Cape Grim, Tasmania, archived samples dating back to 1978) and the
upper troposphere (a passenger aircraft flying from Germany
to South Africa). Further observations originate from air
samples extracted from deep firn in Greenland and allow
trends of atmospheric abundances in the earlier 20th century
to be inferred. All four compounds were not present in the
atmosphere prior to the 1960s. n-C4F10 and n-C5F12 were
also measured in samples collected in the stratosphere with
the data indicating that they have no significant sinks in this region. Emissions were inferred from these observations and found to be comparable with emissions from the EDGAR database for n-C6F14. However, emissions of n-C4F10,n-C5F12 and n-C7F16 were found to differ by up to five
orders of magnitude between our approach and the database.
Although the abundances of the four perfluorocarbons
reported here are currently small (less than 0.3 parts per
trillion) they have strong Global Warming Potentials several
thousand times higher than carbon dioxide (on a 100-yr time
horizon) and continue to increase in the atmosphere. We
estimate that the sum of their cumulative emissions reached
325 million metric tonnes CO2 equivalent at the end of 2009.
| Item Type: | Journal Article |
|---|---|
| Subjects: | Q Science > QD Chemistry |
| Divisions: | Faculty of Science, Technology and Environment (FSTE) > School of Biological and Chemical Sciences |
| Depositing User: | Francis Mani |
| Date Deposited: | 15 Dec 2013 23:06 |
| Last Modified: | 24 Apr 2017 04:08 |
| URI: | https://repository.usp.ac.fj/id/eprint/7035 |
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