Blue carbon oxidation revealed by radiogenic and stable isotopes in a mangrove system

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dc.contributor.authorMaher, DTen_AU
dc.contributor.authorSantos, IRen_AU
dc.contributor.authorSchulz, KGen_AU
dc.contributor.authorCall, Men_AU
dc.contributor.authorJacobsen, GEen_AU
dc.contributor.authorSanders, CJen_AU
dc.date.accessioned2020-03-23T02:41:27Zen_AU
dc.date.available2020-03-23T02:41:27Zen_AU
dc.date.issued2017-05-8en_AU
dc.date.statistics2020-03-20en_AU
dc.description.abstractMangroves are among the most carbon-rich ecosystems on Earth and can sequester carbon in sediments over long timescales. Here we assess whether century-old buried carbon may be remineralized and exported by measuring Δ14C in the exported dissolved inorganic carbon (DIC) as well as sediment Δ14C profiles in a subtropical mangrove. Pore water exchange released isotopically depleted, old DIC to surface waters. Keeling plots revealed that the source of DIC to surface waters had a δ13C-DIC value of −29.4 ±1.9‰ and Δ14C-DIC value of −73±9‰. The respired and exported carbon comes from an average depth of ~40 cm, equivalent to ~100 years of sediment accumulation. Therefore, century-old sequestered carbon is still susceptible to remineralization and tidal export to the coastal ocean via pore water exchange or submarine groundwater discharge. We suggest that the timescales over which blue carbon burial is assessed should consider carbon losses via pore water exchange. © 2017. American Geophysical Unionen_AU
dc.identifier.citationMaher, D. T., Santos, I. R., Schulz, K. G., Call, M., Jacobsen, G. E., & Sanders, C. J. (2017). Blue carbon oxidation revealed by radiogenic and stable isotopes in a mangrove system. Geophysical Research Letters, 44(10), 4889-4896. doi:10.1002/2017GL073753en_AU
dc.identifier.govdoc8470en_AU
dc.identifier.issn0094-8276en_AU
dc.identifier.issue10en_AU
dc.identifier.journaltitleGeophysical Research Lettersen_AU
dc.identifier.pagination4889-4896en_AU
dc.identifier.urihttps://doi.org/10.1002/2017GL073753en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/9187en_AU
dc.identifier.volume44en_AU
dc.language.isoenen_AU
dc.publisherAmerican Geophysical Unionen_AU
dc.subjectMangrovesen_AU
dc.subjectCoastal watersen_AU
dc.subjectGround wateren_AU
dc.subjectCarbon 14en_AU
dc.subjectCarbon 13en_AU
dc.subjectOxidationen_AU
dc.subjectIsotopic exchangeen_AU
dc.subjectMineralizationen_AU
dc.subjectStable isotopesen_AU
dc.titleBlue carbon oxidation revealed by radiogenic and stable isotopes in a mangrove systemen_AU
dc.typeJournal Articleen_AU
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