Radiocarbon analysis of methane emitted from the surface of a raised peat bog |
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| Affiliation: | 1. UFZ — Helmholtz Centre for Environmental Research, Department of Lake Research, Brückstr. 3a, 39114 Magdeburg, Germany;2. UFZ — Helmholtz Centre for Environmental Research, Department of River Ecology, Brückstr. 3a, 39114 Magdeburg, Germany;1. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi''an 710061, China;2. Shaanxi Key Laboratory of Accelerator Mass Spectrometry Technology and Application, Xi''an AMS Center, Xi''an 710061, China;3. Chinese Academy of Sciences Center for Excellence in Quaternary Science and Global Change, Xi''an 710061, China;4. Xi''an Institute for Innovative Earth Environment Research, Xi''an 710061, China;1. Environmental Planning Institute, Seoul National University, Seoul 08826, Republic of Korea;2. Graduate School of Environmental Studies, Seoul National University, Seoul 08826, Republic of Korea;3. Watershed and Total Load Management Research Division, National Institute of Environmental Research, Incheon 22689, Republic of Korea |
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| Abstract: | We developed a method to determine the radiocarbon (14C) concentration of methane (CH4) emitted from the surface of peatlands. The method involves the collection of ∼9 L of air from a static gas sampling chamber which is returned to the laboratory in a foil gas bag. Carbon dioxide is completely removed by passing the sample gas firstly through soda lime and then molecular sieve. Sample methane is then combusted to CO2, cryogenically purified and subsequently processed using routine radiocarbon methods. We verified the reliability of the method using laboratory isotope standards, and successfully trialled it at a temperate raised peat bog, where we found that CH4 emitted from the surface dated to 195–1399 years BP. The new method provides both a reliable and portable way to 14C date methane even at the low concentrations typically associated with peatland surface emissions. |
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