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| Titel |
Improving measurements of SF6 for the study of atmospheric transport and emissions |
| VerfasserIn |
B. D. Hall, G. S. Dutton, D. J. Mondeel, J. D. Nance, M. Rigby, J. H. Butler, F. L. Moore, D. F. Hurst, J. W. Elkins |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 4, no. 11 ; Nr. 4, no. 11 (2011-11-14), S.2441-2451 |
| Datensatznummer |
250002134
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| Publikation (Nr.) |
 copernicus.org/amt-4-2441-2011.pdf |
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| Zusammenfassung |
| Sulfur hexafluoride (SF6) is a potent greenhouse gas and useful
atmospheric tracer. Measurements of SF6 on global and regional scales
are necessary to estimate emissions and to verify or examine the performance
of atmospheric transport models. Typical precision for common gas
chromatographic methods with electron capture detection (GC-ECD) is 1–2%.
We have modified a common GC-ECD method to achieve measurement precision of
0.5% or better. Global mean SF6 measurements were used to examine
changes in the growth rate of SF6 and corresponding SF6 emissions.
Global emissions and mixing ratios from 2000–2008 are consistent with
recently published work. More recent observations show a 10% decline in
SF6 emissions in 2008–2009, which seems to coincide with a decrease in
world economic output. This decline was short-lived, as the global SF6
growth rate has recently increased to near its 2007–2008 maximum value of
0.30±0.03 pmol mol−1 (ppt) yr−1 (95% C.L.). |
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