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Methane emissions partially offset "blue carbon" burial in mangroves.

ABSTRACT: Organic matter burial in mangrove forests results in the removal and long-term storage of atmospheric CO₂, so-called "blue carbon." However, some of this organic matter is metabolized and returned to the atmosphere as CH₄. Because CH₄ has a higher global warming potential than the CO₂ fixed in the organic matter, it can offset the CO₂ removed via carbon burial. We provide the first estimate of the global magnitude of this offset. Our results show that high CH₄ evasion rates have the potential to partially offset blue carbon burial rates in mangrove sediments on average by 20% (sensitivity analysis offset range, 18 to 22%) using the 20-year global warming potential. Hence, mangrove sediment and water CH₄ emissions should be accounted for in future blue carbon assessments.

SUBMITTER: Rosentreter JA

PROVIDER: S-EPMC6007160 | biostudies-literature | 2018 Jun

REPOSITORIES: biostudies-literature

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Methane emissions partially offset "blue carbon" burial in mangroves.

Rosentreter Judith A JA Maher Damien T DT Erler Dirk V DV Murray Rachel H RH Eyre Bradley D BD

Science advances 20180613 6

Organic matter burial in mangrove forests results in the removal and long-term storage of atmospheric CO2, so-called "blue carbon." However, some of this organic matter is metabolized and returned to the atmosphere as CH4. Because CH4 has a higher global warming potential than the CO2 fixed in the organic matter, it can offset the CO2 removed via carbon burial. We provide the first estimate of the global magnitude of this offset. Our results ...[more]

PMID: 29928690

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