Measurements of δ13C in CH4 and using particle dispersion modeling to characterize sources of Arctic methane within an air mass

France, J.L.; Cain, M.; Fisher, R.E.; Lowry, D.; Allen, G.; O'Shea, S.J.; Illingworth, S.; Pyle, J.; Warwick, N.; Jones, B.T.; Gallagher, M.W.; Bower, K.; Le Breton, M.; Percival, C.; Muller, J.; Welpott, A.; Bauguitte, S.; George, C.; Hayman, G.D. ORCID: https://orcid.org/0000-0003-3825-4156; Manning, A.J.; Myhre, C. Lund; Lanoisellé, M.; Nisbet, E.G.. 2016 Measurements of δ13C in CH4 and using particle dispersion modeling to characterize sources of Arctic methane within an air mass. Journal of Geophysical Research: Atmospheres, 121 (23). 14257-14270. https://doi.org/10.1002/2016JD026006

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Abstract/Summary

A stratified air mass enriched in methane (CH4) was sampled at ~600 m to ~2000 m altitude, between the north coast of Norway and Svalbard as part of the Methane in the Arctic: Measurements and Modelling campaign on board the UK's BAe-146-301 Atmospheric Research Aircraft. The approach used here, which combines interpretation of multiple tracers with transport modeling, enables better understanding of the emission sources that contribute to the background mixing ratios of CH4 in the Arctic. Importantly, it allows constraints to be placed on the location and isotopic bulk signature of the emission source(s). Measurements of δ13C in CH4 in whole air samples taken while traversing the air mass identified that the source(s) had a strongly depleted bulk δ13C CH4 isotopic signature of −70 (±2.1)‰. Combined Numerical Atmospheric-dispersion Modeling Environment and inventory analysis indicates that the air mass was recently in the planetary boundary layer over northwest Russia and the Barents Sea, with the likely dominant source of methane being from wetlands in that region.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1002/2016JD026006
UKCEH and CEH Sections/Science Areas:	Reynard
ISSN:	0148-0227
Additional Information. Not used in RCUK Gateway to Research.:	Open Access paper - full text available via Official URL link.
Additional Keywords:	methane, wetlands, Arctic, d13C
NORA Subject Terms:	Ecology and Environment Atmospheric Sciences
Date made live:	22 Feb 2017 13:34 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/516327

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