 |
| Titel |
Distributions, long term trends and emissions of four perfluorocarbons in remote parts of the atmosphere and firn air |
| VerfasserIn |
J. C. Laube, C. Hogan, M. J. Newland, F. S. Mani, P. J. Fraser, C. A. M. Brenninkmeijer, P. Martinerie, D. E. Oram, T. Röckmann, J. Schwander, E. Witrant, G. P. Mills, C. E. Reeves, W. T. Sturges |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 12, no. 9 ; Nr. 12, no. 9 (2012-05-08), S.4081-4090 |
| Datensatznummer |
250011121
|
| Publikation (Nr.) |
 copernicus.org/acp-12-4081-2012.pdf |
|
|
|
|
|
| Zusammenfassung |
| 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 n-hexadecafluoroheptane (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. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|