Accounting for black carbon lowers estimates of blue carbon storage services

Abstract The canopies and roots of seagrass, mangrove, and saltmarsh protect a legacy of buried sedimentary organic carbon from resuspension and remineralisation. This legacy’s value, in terms of mitigating anthropogenic emissions of CO2, is based on total organic carbon (TOC) inventories to a depth...

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Autores principales:	Swee Theng Chew, John B. Gallagher
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2018
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/70674b55e7e94c839258cfbefae0a899
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spelling	oai:doaj.org-article:70674b55e7e94c839258cfbefae0a8992021-12-02T15:08:43ZAccounting for black carbon lowers estimates of blue carbon storage services10.1038/s41598-018-20644-22045-2322https://doaj.org/article/70674b55e7e94c839258cfbefae0a8992018-02-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-20644-2https://doaj.org/toc/2045-2322Abstract The canopies and roots of seagrass, mangrove, and saltmarsh protect a legacy of buried sedimentary organic carbon from resuspension and remineralisation. This legacy’s value, in terms of mitigating anthropogenic emissions of CO2, is based on total organic carbon (TOC) inventories to a depth likely to be disturbed. However, failure to subtract allochthonous recalcitrant carbon overvalues the storage service. Simply put, burial of oxidation-resistant organics formed outside of the ecosystem provides no additional protection from remineralisation. Here, we assess whether black carbon (BC), an allochthonous and recalcitrant form of organic carbon, is contributing to a significant overestimation of blue carbon stocks. To test this supposition, BC and TOC contents were measured in different types of seagrass and mangrove sediment cores across tropical and temperate regimes, with different histories of air pollution and fire together with a reanalysis of published data from a subtropical system. The results suggest current carbon stock estimates are positively biased, particularly for low-organic-content sandy seagrass environs, by 18 ± 3% (±95% confidence interval) and 43 ± 21% (±95% CI) for the temperate and tropical regions respectively. The higher BC fractions appear to originate from atmospheric deposition and substantially enrich the relatively low TOC fraction within these environs.Swee Theng ChewJohn B. GallagherNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-8 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Swee Theng Chew John B. Gallagher Accounting for black carbon lowers estimates of blue carbon storage services
description	Abstract The canopies and roots of seagrass, mangrove, and saltmarsh protect a legacy of buried sedimentary organic carbon from resuspension and remineralisation. This legacy’s value, in terms of mitigating anthropogenic emissions of CO2, is based on total organic carbon (TOC) inventories to a depth likely to be disturbed. However, failure to subtract allochthonous recalcitrant carbon overvalues the storage service. Simply put, burial of oxidation-resistant organics formed outside of the ecosystem provides no additional protection from remineralisation. Here, we assess whether black carbon (BC), an allochthonous and recalcitrant form of organic carbon, is contributing to a significant overestimation of blue carbon stocks. To test this supposition, BC and TOC contents were measured in different types of seagrass and mangrove sediment cores across tropical and temperate regimes, with different histories of air pollution and fire together with a reanalysis of published data from a subtropical system. The results suggest current carbon stock estimates are positively biased, particularly for low-organic-content sandy seagrass environs, by 18 ± 3% (±95% confidence interval) and 43 ± 21% (±95% CI) for the temperate and tropical regions respectively. The higher BC fractions appear to originate from atmospheric deposition and substantially enrich the relatively low TOC fraction within these environs.
format	article
author	Swee Theng Chew John B. Gallagher
author_facet	Swee Theng Chew John B. Gallagher
author_sort	Swee Theng Chew
title	Accounting for black carbon lowers estimates of blue carbon storage services
title_short	Accounting for black carbon lowers estimates of blue carbon storage services
title_full	Accounting for black carbon lowers estimates of blue carbon storage services
title_fullStr	Accounting for black carbon lowers estimates of blue carbon storage services
title_full_unstemmed	Accounting for black carbon lowers estimates of blue carbon storage services
title_sort	accounting for black carbon lowers estimates of blue carbon storage services
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/70674b55e7e94c839258cfbefae0a899
work_keys_str_mv	AT sweethengchew accountingforblackcarbonlowersestimatesofbluecarbonstorageservices AT johnbgallagher accountingforblackcarbonlowersestimatesofbluecarbonstorageservices
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Accounting for black carbon lowers estimates of blue carbon storage services

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