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Sci Adv. 2018 Jun 13;4(6):eaao4985. doi: 10.1126/sciadv.aao4985. eCollection 2018 Jun.

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

Author information

1
Centre for Coastal Biogeochemistry, School of Environment, Science and Engineering, Southern Cross University, Lismore, New South Wales 2480, Australia.
2
Southern Cross Geoscience, Southern Cross University, Lismore, New South Wales 2480, Australia.

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.

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