14C measurements of biogenic and anthropogenic methane sources

Espic, Christophe; Liechti, Michael; Battaglia, Michael; Salazar Quintero, Gary Abdiel; Szidat, Sönke (3 July 2017). 14C measurements of biogenic and anthropogenic methane sources. In: 2nd International Radiocarbon in the Environment Conference. Debrecen, Hungary. 03.-07.07.2017.

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Methane contributes substantially to global warming as the second most important anthropogenic greenhouse gas. Methane sources are diverse and remain poorly quantified and not well understood. The radiocarbon (14C) content of these emissions is of growing interest since it can be used as a tool for a methane source apportionment (Lassey et al., 2007). Indeed, contemporary methane (e.g. agriculture, biomass burning) contains present-day 14C levels whereas fossil methane (e.g. fossil fuels, geologic sources) is 14C-free. However, this task is challenging given the very large amounts of methane required and its very low concentration in the atmosphere. Methane is usually cryogenically separated from other trace gases (mainly CO and CO2) but cross contamination remains an issue difficult to overcome (Pack et al., 2015). Our research aims at enabling the extraction of methane from various kinds of environments (atmosphere, fresh waters and wetlands) and performing 14C measurements with the AMS MICADAS in our laboratory (Szidat et al., 2014). We adapt and develop analytical setups to preconcentrate methane directly in the field in order to bring small samples to the lab where methane is purified and prepared for 14C measurements. We develop a preparative gas chromatography technique to obtain pure methane from the preconcentrated samples and prepare them for 14C analysis with an AMS.

Item Type:

Conference or Workshop Item (Abstract)

Division/Institute:

10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR)
08 Faculty of Science > Departement of Chemistry and Biochemistry

UniBE Contributor:

Espic, Christophe; Liechti, Michael; Battaglia, Michael; Salazar Quintero, Gary Abdiel and Szidat, Sönke

Subjects:

500 Science > 540 Chemistry

Language:

English

Submitter:

Sönke Szidat

Date Deposited:

16 Apr 2018 10:41

Last Modified:

03 Nov 2019 04:53

Related URLs:

BORIS DOI:

10.7892/boris.108871

URI:

https://boris.unibe.ch/id/eprint/108871

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