Carbon isotopic signature of coal-derived methane emissions to the atmosphere: from coalification to alteration

Zazzeri, Giulia, Lowry, Dave, Fisher, Rebecca E., France, James L., Lanoisellé, Mathias, Kelly, Bryce F. J., Necki, Jaroslaw M., Iverach, Charlotte P., Ginty, Elisa, Zimnoch, Miroslaw, Jasek, Alina and Nisbet, Euan G. (2016) Carbon isotopic signature of coal-derived methane emissions to the atmosphere: from coalification to alteration. Atmospheric Chemistry and Physics, 16 (21). pp. 13669-13680. ISSN 1680-7324

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Currently, the atmospheric methane burden is rising rapidly, but the extent to which shifts in coal production contribute to this rise is not known. Coalbed methane emissions into the atmosphere are poorly characterised, and this study provides representative δ13CCH4 signatures of methane emissions from specific coalfields. Integrated methane emissions from both underground and opencast coal mines in the UK, Australia and Poland were sampled and isotopically characterised. Progression in coal rank and secondary biogenic production of methane due to incursion of water are suggested as the processes affecting the isotopic composition of coal-derived methane. An averaged value of −65 ‰ has been assigned to bituminous coal exploited in open cast mines and of −55 ‰ in deep mines, whereas values of −40 and −30 ‰ can be allocated to anthracite opencast and deep mines respectively. However, the isotopic signatures that are included in global atmospheric modelling of coal emissions should be region- or nation-specific, as greater detail is needed, given the wide global variation in coal type.

Item Type: Article
Additional Information: © Author(s) 2016. This work is distributed under the Creative Commons Attribution 3.0 License.
Faculty \ School: Faculty of Science > School of Environmental Sciences
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Depositing User: Pure Connector
Date Deposited: 23 Nov 2016 15:00
Last Modified: 22 Oct 2022 01:55
DOI: 10.5194/acp-16-13669-2016

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