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Philosophical transactions of the Royal Society of London. Series A: Mathematical, physical, and engineering sciences, 2022-01, Vol.380 (2215), p.20200449
δ 13 C methane source signatures from tropical wetland and rice field emissions
Ist Teil von
Philosophical transactions of the Royal Society of London. Series A: Mathematical, physical, and engineering sciences, 2022-01, Vol.380 (2215), p.20200449
Ort / Verlag
England
Erscheinungsjahr
2022
Quelle
MEDLINE
Beschreibungen/Notizen
The atmospheric methane (CH
) burden is rising sharply, but the causes are still not well understood. One factor of uncertainty is the importance of tropical CH
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
C
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
C
in ambient air has been conducted at the Chacaltaya observatory, Bolivia and Southern Botswana. Both long-term records are dominated by biogenic CH
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 CH
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
C
sources and hints at significant seasonal variation in tropical wetland
C
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)'.