Total alkalinity production in a mangrove ecosystem reveals an overlooked Blue Carbon component

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http://hdl.handle.net/10138/333427

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Saderne , V , Fusi , M , Thomson , T , Dunne , A , Mahmud , F , Roth , F , Carvalho , S & Duarte , C M 2021 , ' Total alkalinity production in a mangrove ecosystem reveals an overlooked Blue Carbon component ' , Limnology and oceanography letters , vol. 6 , no. 2 , pp. 61-67 . https://doi.org/10.1002/lol2.10170

Title: Total alkalinity production in a mangrove ecosystem reveals an overlooked Blue Carbon component
Author: Saderne, Vincent; Fusi, Marco; Thomson, Timothy; Dunne, Aislinn; Mahmud, Fatima; Roth, Florian; Carvalho, Susana; Duarte, Carlos M.
Contributor: University of Helsinki, Biological stations
Date: 2021-04
Language: eng
Number of pages: 7
Belongs to series: Limnology and oceanography letters
ISSN: 2378-2242
URI: http://hdl.handle.net/10138/333427
Abstract: Mangroves have the capacity to sequester organic carbon (C-org) in their sediments permanently. However, the carbon budget of mangroves is also affected by the total alkalinity (TA) budget. Principally, TA emitted from carbonate sediment dissolution is a perennial sink of atmospheric CO2. The assessment of the TA budget of mangrove carbonate sediments in the Red Sea revealed a large TA emission of 403 +/- 17 mmol m(-2)d(-1), independent of light, seasons, or the presence of pneumatophores, compared to -36 +/- 10 mmol m(-2)d(-1)in lagoon sediment. We estimate the TA emission from carbonate dissolution in Red Sea mangroves supported a CO2 uptake of 345 +/- 15 gC m(-2)yr(-1), 23-fold the C-org burial rate of 15 gC m(-2)yr(-1). The focus on C-org burial in sediments may substantially underestimate the role of mangroves in CO(2)removal. Quantifying the role of mangroves in climate change mitigation requires carbonate dissolution to be included in assessments.
Subject: DISSOLVED INORGANIC CARBON
DISSOLUTION
SEDIMENTS
NITROGEN
FLUXES
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1181 Ecology, evolutionary biology
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