δ13C methane source signatures from tropical wetland and rice field emissions

France, James L., 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, Hoyt, Alison M., Jones, Anna E., Lanoisellé, Mathias, Moreno, Isabel, Nisbet-Jones, Peter B. R., Oram, David, Pasternak, Dominika, Pitt, Joseph R., Skiba, Ute, Stephens, Mark, Wilde, Shona E. and Nisbet, Euan G. (2022) δ13C methane source signatures from tropical wetland and rice field emissions. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 380 (2215). ISSN 1364-503X

[img]
Preview
PDF (rsta_2020_0449) - Published Version
Available under License Creative Commons Attribution.

Download (1MB) | Preview

Abstract

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: Article
Faculty \ School: Faculty of Science > School of Environmental Sciences
Related URLs:
Depositing User: LivePure Connector
Date Deposited: 15 Dec 2021 15:30
Last Modified: 23 Jun 2022 14:32
URI: https://ueaeprints.uea.ac.uk/id/eprint/82697
DOI: 10.1098/rsta.2020.0449

Actions (login required)

View Item View Item