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| Titel |
Estimates of European emissions of methyl chloroform using a Bayesian inversion method |
| VerfasserIn |
M. Maione, F. Graziosi, J. Arduini, F. Furlani, U. Giostra, D. R. Blake, P. Bonasoni, X. Fang, S. A. Montzka, S. J. O'Doherty, S. Reimann, A. Stohl, M. K. Vollmer |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 14, no. 18 ; Nr. 14, no. 18 (2014-09-16), S.9755-9770 |
| Datensatznummer |
250119039
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| Publikation (Nr.) |
 copernicus.org/acp-14-9755-2014.pdf |
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| Zusammenfassung |
Methyl chloroform (MCF) is a man-made chlorinated solvent contributing to
the destruction of stratospheric ozone and is controlled under the "Montreal
Protocol on Substances that Deplete the Ozone Layer" and its amendments, which called for its phase-out in 1996 in developed countries and 2015 in
developing countries. Long-term, high-frequency observations of MCF carried
out at three European sites show a constant decline in the background mixing
ratios of MCF. However, we observe persistent non-negligible mixing ratio
enhancements of MCF in pollution episodes, suggesting unexpectedly high
ongoing emissions in Europe. In order to identify the source regions and to
give an estimate of the magnitude of such emissions, we have used a Bayesian
inversion method and a point source analysis, based on high-frequency
long-term observations at the three European sites.
The inversion identified southeastern France (SEF) as a region with
enhanced MCF emissions. This estimate was confirmed by the point source
analysis. We performed this analysis using an 11-year data set, from
January 2002 to December 2012. Overall, emissions estimated for the European
study domain decreased nearly exponentially from 1.1 Gg yr−1 in 2002 to
0.32 Gg yr−1 in 2012, of which the estimated emissions from the SEF
region accounted for 0.49 Gg yr−1 in 2002 and 0.20 Gg yr−1 in
2012. The European estimates are a significant fraction of the total
semi-hemisphere (30–90° N) emissions, contributing a minimum of 9.8% in
2004 and a maximum of 33.7% in 2011, of which on average 50% are from
the SEF region. On the global scale, the SEF region is thus responsible for
a minimum of 2.6% (in 2003) and a maximum of 10.3% (in 2009) of the
global MCF emissions. |
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