Journal
NATURE COMMUNICATIONS
Volume 10, Issue -, Pages -Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41467-019-08842-6
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Funding
- King Abdullah University of Science and Technology (KAUST)
- Australian Research Council through grants LIEF Project [LE170100219, DE160100443, DE170101524, DP150103286, DP150102092, DP160100248, DE130101084, LP160100242, LE140100083]
- US National Science Foundation [DEB-1237517]
- Independent Research Fund Denmark (CARMA) [8021-00222B]
- COCOA project under the BONUS programme - EU 7th Framework Programme
- Danish Research Council
- Obra Social la Caixa fellowship [LCF/BQ/ES14/10320004]
- Generalitat de Catalunya [2017 SGR-1588]
- NERC [NE/L001535/1]
- JSPS KAKENHI [18H04156]
- Ministry of the Environment, Japan [S-14]
- National Science Foundation under South Florida Water, Sustainability and Climate grant [EAR-1204079]
- Spanish Ministry of Science, Innovation and Universities
- Netherlands Earth System Science Center
- MinECo [MDM2015-0552]
- Grants-in-Aid for Scientific Research [18H04156] Funding Source: KAKEN
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Calcium carbonates (CaCO3) often accumulate in mangrove and seagrass sediments. As CaCO3 production emits CO2, there is concern that this may partially offset the role of Blue Carbon ecosystems as CO2 sinks through the burial of organic carbon (C-org). A global collection of data on inorganic carbon burial rates (C-inorg, 12% of CaCO3 mass) revealed global rates of 0.8 TgC(inorg) yr(-1) and 15-62 TgC(inorg) yr(-1) in mangrove and seagrass ecosystems, respectively. In seagrass, CaCO3 burial may correspond to an offset of 30% of the net CO2 sequestration. However, a mass balance assessment highlights that the C-inorg burial is mainly supported by inputs from adjacent ecosystems rather than by local calcification, and that Blue Carbon ecosystems are sites of net CaCO3 dissolution. Hence, CaCO3 burial in Blue Carbon ecosystems contribute to seabed elevation and therefore buffers sea-level rise, without undermining their role as CO2 sinks.
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