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Carbonate chemistry and carbon sequestration driven by inorganic carbon outwelling from mangroves and saltmarshes

Reithmaier, Gloria M.S. (author)
Gothenburg University,Göteborgs universitet,Institutionen för marina vetenskaper,Department of marine sciences
Cabral dos Santos, Alex, 1990 (author)
Gothenburg University,Göteborgs universitet,Institutionen för marina vetenskaper,Department of marine sciences
Akhand, Anirban (author)
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Bogard, Matthew J. (author)
Borges, Alberto V. (author)
Bouillon, Steven (author)
Burdige, David J. (author)
Call, Mitchel (author)
Chen, Nengwang (author)
Chen, Xiaogang (author)
Cotovicz, Luiz C. (author)
Eagle, Meagan J. (author)
Kristensen, Erik (author)
Kroeger, Kevin D. (author)
Lu, Zeyang (author)
Maher, Damien T. (author)
Pérez-Lloréns, J. Lucas (author)
Ray, Raghab (author)
Taillardat, Pierre (author)
Tamborski, Joseph J. (author)
Upstill-Goddard, Rob C. (author)
Wang, Faming (author)
Wang, Zhaohui Aleck (author)
Xiao, Kai (author)
Yau, Yvonne Yu Yan (author)
Gothenburg University,Göteborgs universitet,Institutionen för marina vetenskaper,Department of marine sciences
Santos, Isaac R. (author)
Gothenburg University,Göteborgs universitet,Institutionen för marina vetenskaper,Department of marine sciences
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 (creator_code:org_t)
2023
2023
English.
In: Nature Communications. - 2041-1723. ; 14:1
Related links:
https://gup.ub.gu.se...
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https://doi.org/10.1...
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  • Journal article (peer-reviewed)
Abstract Subject headings
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  • Mangroves and saltmarshes are biogeochemical hotspots storing carbon in sediments and in the ocean following lateral carbon export (outwelling). Coastal seawater pH is modified by both uptake of anthropogenic carbon dioxide and natural biogeochemical processes, e.g., wetland inputs. Here, we investigate how mangroves and saltmarshes influence coastal carbonate chemistry and quantify the contribution of alkalinity and dissolved inorganic carbon (DIC) outwelling to blue carbon budgets. Observations from 45 mangroves and 16 saltmarshes worldwide revealed that >70% of intertidal wetlands export more DIC than alkalinity, potentially decreasing thepH of coastal waters. Porewater-derived DIC outwelling (81 ± 47 mmol m−2 d−1 in mangroves and 57 ± 104 mmol m−2 d−1 in saltmarshes) was the major term in blue carbon budgets. However, substantial amounts of fixed carbon remain unaccounted for. Concurrently, alkalinity outwelling was similar or higher than sediment carbon burial and is therefore a significant but often overlooked carbon sequestration mechanism.

Subject headings

NATURVETENSKAP  -- Biologi -- Ekologi (hsv//swe)
NATURAL SCIENCES  -- Biological Sciences -- Ecology (hsv//eng)

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