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| Titel |
Emission estimates and characterisation of HFCs measured over the United Kingdom |
| VerfasserIn |
Daniel Say, Simon O'Doherty, Matt Rigby, Alistair Manning |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250132525
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| Publikation (Nr.) |
 EGU/EGU2016-13042.pdf |
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| Zusammenfassung |
| Due to the large horizontal (and vertical) scales on which they operate, aircraft offer a unique
platform from which to measure trace gases in the atmosphere. When combined with an
atmospheric transport model, these measurements may be used to infer emissions on a
national scale, a useful step in the verification of ‘bottom-up’ greenhouse gas inventories.
Here, we present two years of aircraft measurements collected as an extension of the
Greenhouse gAses Uk and Global Emissions (GAUGE) airborne campaign. In total,
172 whole air samples were analysed for a suite of trace gases. We focus on seven
hydrofluorocarbons (HFCs), a diverse subset of fluorinated gases with high global
warming potentials. Samples collected directly above and downwind of the UK were
compared to samples of inflow air mass from the Atlantic Ocean, and significant
enhancements were observed for all seven species. Using the model:observation
ratio, we scale UK a priori emissions of each HFC in order to estimate the 2014
flux. Our emission rates typically agree well with other top-down estimates from
the literature, but less so with extrapolated inventory data. With a flux of 3.14 ±
1.0 Gg yr−1, our HFC-134a estimate was approximately half as large as the UK
inventory, suggesting a systematic discrepancy between competing methodologies. |
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