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| Titel |
Mapping methane plumes and the delta C-13 composition of anthropogenic sources in southwest Germany |
| VerfasserIn |
Martina Schmidt, Christiane Yeman, Florian Dinger, Sebastien Ars, Camille Yver Kwok |
| 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 |
250131188
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| Publikation (Nr.) |
 EGU/EGU2016-11566.pdf |
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| Zusammenfassung |
| A mobile analyser based on Cavity-Ring-Down Spectroscopy was installed on a vehicle, together with a GPS receiver. This allows us to measure atmospheric methane and carbon dioxide mole fractions and the C-13 isotopes of both gases while driving. Methane mole fraction measurements show a good repeatability even for high frequency measurements whereas the 13CH4 measurements need a longer averaging time of 1 minute for 1 ‰ repeatability and 15 minutes for 0.23 ‰ repeatability. Driving through an emission plume, the signal is typically only 60 seconds long. To overcome the precision problem for the isotope measurements we filled a 25 m tubing when driving through the plume, which was then flushed back through our analyser during 30 minutes. During several campaigns we visited a land fill site, a biogas plant, a dairy cow farm and a natural gas storage and measured an averaged isotopic methane signature(C-13 ) of –58.3 ±3 ‰, -62.5 ± 1‰, -62.2 ± 2‰, -51 ± 7‰, respectively. |
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