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| Titel |
Emissions halted of the potent greenhouse gas SF5CF3 |
| VerfasserIn |
W. T. Sturges, D. E. Oram, J. C. Laube, C. E. Reeves, M. J. Newland, C. Hogan, P. Martinerie, E. Witrant, C. A. M. Brenninkmeijer, T. J. Schuck, P. J. Fraser |
| 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 ; 12, no. 8 ; Nr. 12, no. 8 (2012-04-19), S.3653-3658 |
| Datensatznummer |
250011067
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| Publikation (Nr.) |
 copernicus.org/acp-12-3653-2012.pdf |
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| Zusammenfassung |
| Long term measurements in background air (Cape Grim, Tasmania) and firn air
(NEEM, Greenland) of the potent long-lived greenhouse gas SF5CF3
show that emissions declined after the late 1990s, having grown since the
1950s, and became indistinguishable from zero after 2003. The timing of this
decline suggests that emissions of this gas may have been related to the
production of certain fluorochemicals; production of which have been
recently phased out. An earlier observation of closely correlated
atmospheric abundances of SF5CF3 and SF6 are shown here to
have likely been purely coincidental, as their respective trends diverged
after 2002. Due to its long lifetime (ca. 900 yr), atmospheric concentrations
of SF5CF3 have not declined, and it is now well mixed between
hemispheres, as is also shown here from interhemispheric aircraft
measurements. Total cumulative emissions of SF5CF3 amount to
around 5 kT. |
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