Articles | Volume 18, issue 11
https://doi.org/10.5194/bg-18-3505-2021
https://doi.org/10.5194/bg-18-3505-2021
Research article
 | 
11 Jun 2021
Research article |  | 11 Jun 2021

Geographic variability in freshwater methane hydrogen isotope ratios and its implications for global isotopic source signatures

Peter M. J. Douglas, Emerald Stratigopoulos, Sanga Park, and Dawson Phan

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Short summary
Hydrogen isotopes could be a useful tool to help resolve the geographic distribution of methane emissions from freshwater environments. We analyzed an expanded global dataset of freshwater methane hydrogen isotope ratios and found significant geographic variation linked to water isotopic composition. This geographic variability could be used to resolve changing methane fluxes from freshwater environments and provide more accurate estimates of the relative balance of global methane sources.
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