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| Titel |
History of atmospheric SF6 from 1973 to 2008 |
| VerfasserIn |
M. Rigby, J. Mühle, B. R. Miller, R. G. Prinn, P. B. Krummel, L. P. Steele, P. J. Fraser, P. K. Salameh, C. M. Harth, R. F. Weiss, B. R. Greally, S. O'Doherty, P. G. Simmonds, M. K. Vollmer, S. Reimann, J. Kim, K.-R. Kim, H. J. Wang, J. G. J. Olivier, E. J. Dlugokencky, G. S. Dutton, B. D. Hall, J. W. Elkins |
| 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 ; 10, no. 21 ; Nr. 10, no. 21 (2010-11-04), S.10305-10320 |
| Datensatznummer |
250008868
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| Publikation (Nr.) |
 copernicus.org/acp-10-10305-2010.pdf |
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| Zusammenfassung |
| We present atmospheric sulfur hexafluoride (SF6) mole fractions and
emissions estimates from the 1970s to 2008. Measurements were made of
archived air samples starting from 1973 in the Northern Hemisphere and from
1978 in the Southern Hemisphere, using the Advanced Global Atmospheric Gases
Experiment (AGAGE) gas chromatographic-mass spectrometric (GC-MS) systems.
These measurements were combined with modern high-frequency GC-MS and
GC-electron capture detection (ECD) data from AGAGE monitoring sites, to
produce a unique 35-year atmospheric record of this potent greenhouse gas.
Atmospheric mole fractions were found to have increased by more than an order
of magnitude between 1973 and 2008. The 2008 growth rate was the highest
recorded, at 0.29 ± 0.02 pmolmol−1 yr−1. A
three-dimensional chemical transport model and a minimum variance Bayesian
inverse method was used to estimate annual emission rates using the
measurements, with a priori estimates from the Emissions Database for Global
Atmospheric Research (EDGAR, version 4). Consistent with the mole fraction
growth rate maximum, global emissions during 2008 were also the highest in
the 1973–2008 period, reaching 7.4 ± 0.6 Gg yr−1
(1-σ uncertainties) and surpassing the previous maximum in 1995. The
2008 values follow an increase in emissions of 48 ± 20% since 2001. A
second global inversion which also incorporated National Oceanic and
Atmospheric Administration (NOAA) flask measurements and in situ
monitoring site data agreed well with the emissions derived using AGAGE
measurements alone. By estimating continent-scale emissions using all
available AGAGE and NOAA surface measurements covering the period 2004–2008,
with no pollution filtering, we find that it is likely that much of the
global emissions rise during this five-year period originated primarily from
Asian developing countries that do not report detailed, annual emissions to
the United Nations Framework Convention on Climate Change (UNFCCC). We also
find it likely that SF6 emissions reported to the UNFCCC were
underestimated between at least 2004 and 2005. |
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