2021
DOI: 10.1098/rsta.2021.0112
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Isotopic signatures of methane emissions from tropical fires, agriculture and wetlands: the MOYA and ZWAMPS flights

Abstract: We report methane isotopologue data from aircraft and ground measurements in Africa and South America. Aircraft campaigns sampled strong methane fluxes over tropical papyrus wetlands in the Nile, Congo and Zambezi basins, herbaceous wetlands in Bolivian southern Amazonia, and over fires in African woodland, cropland and savannah grassland. Measured methane δ 13 C CH 4 isotopic signatures were in the range −55 … Show more

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Cited by 9 publications
(15 citation statements)
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“…The isotopic results are closely comparable to results from parallel southern outer tropical wetlands in Zambia ( 12 ) and to previously reported overflight measurements from Brazilian Amazonian wetlands that gave a δ 13 C CH4 source signature of −58.8‰ ( 13 ). Such sources, if increasing, would help drive the global methane burden to more negative δ 13 C CH4 emissions.…”
Section: Discussionsupporting
confidence: 89%
“…The isotopic results are closely comparable to results from parallel southern outer tropical wetlands in Zambia ( 12 ) and to previously reported overflight measurements from Brazilian Amazonian wetlands that gave a δ 13 C CH4 source signature of −58.8‰ ( 13 ). Such sources, if increasing, would help drive the global methane burden to more negative δ 13 C CH4 emissions.…”
Section: Discussionsupporting
confidence: 89%
“…This work suggests total emissions from wetlands in the Congo and Zambezi basins may be very large. Interestingly, the regional δ13CnormalCnormalH4 ${\delta }^{13}{\mathrm{C}}_{\mathrm{C}\mathrm{H}4}$ isotopic signatures of emissions of outer (single rainy season) tropical C4/C3 wetlands in Zambia and Bolivian Amazonia were very similar, around −59‰ to −60‰ (France et al., 2021; MOYA Team et al., 2021), presumably reflecting the similarity of the seasonal outer tropical C4/C3 vegetation mix.…”
Section: The Wetland Hypothesismentioning
confidence: 99%
“…(2022) estimated a mean global wetland δ13CnormalCnormalH4 ${\delta }^{13}{\mathrm{C}}_{\mathrm{C}\mathrm{H}4}$ signature of −61.3 ± 0.7‰. This reflects a mix between northern high‐latitude C3 plant wetlands (mean −67.8‰) and tropical C4‐rich wetlands (mean −56.7‰) (Dlugokencky et al., 2011; Ganesan et al., 2018; MOYA/ZWAMPS Team et al., 2021; Quay et al., 1988; Menoud et al., 2022; Sherwood et al., 2017). Note the means and precisions cited here are from partial and perhaps unrepresentative sampling: real world averages may be several ‰ different.…”
Section: Methane Sources and Sinks; Isotopic Impactsmentioning
confidence: 99%
See 1 more Smart Citation
“…A metánkoncentráció-mérések örvendetesen szaporodnak a világ fejlettebb országaiban. Sajnos, éppen a kritikus trópusi területek lefedetlenek, ezért ott az eseti expedíciós mérések mellett (Gondwe et al, 2021;Stell et al, 2021;Gauci et al, 2022;Nisbet et al, 2022a) mindenképpen folyamatos megfigyelésekre is szükség lenne. A kulcsfontosságú stabilizotóp-összetétel mérések ( 12 CH 4 , 13 CH 4 ) még meglehetősen ritkák a világban, de Magyarországon már folytak ilyen mérések (Varga et al, 2021).…”
Section: Kockázatokunclassified