δ13C methane source signatures from tropical wetlands and rice field emissions

France, James L. ORCID: https://orcid.org/0000-0002-8785-1240; Fisher, Rebecca E.; Lowry, David; Allen, Grant; Andrade, Marcos F.; Bauguitte, Stéphane J.-B.; Bower, Keith; Broderick, Timothy J.; Daly, Michael C.; Forster, Grant; Gondwe, Mangaliso; Helfter, Carole ORCID: https://orcid.org/0000-0001-5773-4652; Hoyte, Alison M.; Jones, Anna E. ORCID: https://orcid.org/0000-0002-2040-4841; Lanoiselle, Mathias; Moreno, Isabel; Nisbet-Jones, Peter B.R.; Oram, David; Pasternak, Dominika; Pitt, Joseph R.; Skiba, Ute ORCID: https://orcid.org/0000-0001-8659-6092; Stephens, Mark; Wilde, Shona E.; Nisbet, Euan G.. 2022 δ13C methane source signatures from tropical wetlands and rice field emissions. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 380 (2215), 20200449. 18, pp. https://doi.org/10.1098/rsta.2020.0449

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Abstract/Summary

The atmospheric methane (CH4) burden is rising sharply, but the causes are still not well understood. One factor of uncertainty is the importance of tropical CH4 emissions into the global mix. Isotopic signatures of major sources remain poorly constrained, despite their usefulness in constraining the global methane budget. Here, a collection of new δ13CCH4 signatures is presented for a range of tropical wetlands and rice fields determined from air samples collected during campaigns from 2016 to 2020. Long-term monitoring of δ13CCH4 in ambient air has been conducted at the Chacaltaya observatory, Bolivia and Southern Botswana. Both long-term records are dominated by biogenic CH4 sources, with isotopic signatures expected from wetland sources. From the longer-term Bolivian record, a seasonal isotopic shift is observed corresponding to wetland extent suggesting that there is input of relatively isotopically light CH4 to the atmosphere during periods of reduced wetland extent. This new data expands the geographical extent and range of measurements of tropical wetland and rice δ13CCH4 sources and hints at significant seasonal variation in tropical wetland δ13CCH4 signatures which may be important to capture in future global and regional models. This article is part of a discussion meeting issue ‘Rising methane: is warming feeding warming? (part 2)’.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1098/rsta.2020.0449
UKCEH and CEH Sections/Science Areas:	Atmospheric Chemistry and Effects (Science Area 2017-)
ISSN:	1364-503X
Additional Information. Not used in RCUK Gateway to Research.:	Open Access paper - full text available via Official URL link.
Additional Keywords:	methane, tropical wetlands, climate, greenhouse gas
NORA Subject Terms:	Atmospheric Sciences
Date made live:	13 Jan 2022 08:42 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/531282

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