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

Reithmaier，Gloria M.S.1; Cabral，Alex1; Akhand，Anirban2,3; Bogard，Matthew J.4; Borges，Alberto V.5; Bouillon，Steven6; Burdige，David J.7; Call，Mitchel8; Chen，Nengwang9; Chen，Xiaogang10; Cotovicz，Luiz C.11,12; Eagle，Meagan J.13; Kristensen，Erik14; Kroeger，Kevin D.13; Lu，Zeyang15; Maher，Damien T.8; Pérez-Lloréns，J. Lucas16; Ray，Raghab17; Taillardat，Pierre18; Tamborski，Joseph J.7; Upstill-Goddard，Rob C.19; Wang，Faming20; Wang，Zhaohui Aleck21; Xiao，Kai22; Yau，Yvonne Y.Y.1; Santos，Isaac R.1

2023-12-01

10.1038/s41467-023-44037-w

Nature Communications   影响因子和分区

2041-1723

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 the pH of coastal waters. Porewater-derived DIC outwelling (81 ± 47 mmol m d in mangroves and 57 ± 104 mmol m d 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.

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2-s2.0-85179359439

Scopus

1.Department of Marine Sciences,University of Gothenburg,Gothenburg,41319,Sweden
2.Department of Ocean Science,Hong Kong University of Science and Technology,Kowloon,Hong Kong
3.Coastal and Estuarine Environment Research Group,Port and Airport Research Institute,Yokosuka,3-1-1 Nagase,239-0826,Japan
4.Department of Biological Sciences,University of Lethbridge,Lethbridge,Canada
5.Chemical Oceanography Unit,University of Liège,Liège,4000,Belgium
6.Department of Earth and Environmental Sciences,KU Leuven,Leuven,3001,Belgium
7.Department of Ocean and Earth Sciences,Old Dominion University,Norfolk,23529,United States
8.Faculty of Science and Engineering,Southern Cross University,Lismore,2480,Australia
9.State Key Laboratory of Marine Environment Science,Xiamen University,Xiamen,361102,China
10.School of Engineering,Westlake University,Hangzhou,310024,China
11.Department of Marine Chemistry,Leibniz Institute for Baltic Sea Research,Warnemünde,Germany
12.Institute of Marine Sciences (LABOMAR),Federal University of Ceará (UFC),Fortaleza,Brazil
13.Woods Hole Coastal and Marine Science Center,U.S. Geological Survey,Woods Hole,384 Woods Hole Road,02543,United States
14.Department of Biology,University of Southern Denmark,Odense,5230,Denmark
15.College of the Environment and Ecology,Xiamen University,Xiamen,361102,China
16.Instituto Universitario de Investigación Marina (INMAR),University of Cádiz,Cádiz,Puerto Real,Spain
17.Atmosphere and Ocean Research Institute,The University of Tokyo,Tokyo,Japan
18.NUS Environmental Research Institute,National University of Singapore,Singapore,117411,Singapore
19.School of Natural and Environmental Sciences,Newcastle University,Newcastle upon Tyne,NE1 7RU,United Kingdom
20.Xiaoliang Research Station of Tropical Coastal Ecosystems,Chinese Academy of Sciences,Guangzhou,510650,China
21.Department of Marine Chemistry and Geochemistry,Woods Hole Oceanographic Institution,Woods Hole,02543,United States
22.School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,China

Reithmaier，Gloria M.S.,Cabral，Alex,Akhand，Anirban,et al. Carbonate chemistry and carbon sequestration driven by inorganic carbon outwelling from mangroves and saltmarshes[J]. Nature Communications,2023,14(1).

Reithmaier，Gloria M.S..,Cabral，Alex.,Akhand，Anirban.,Bogard，Matthew J..,Borges，Alberto V..,...&Santos，Isaac R..(2023).Carbonate chemistry and carbon sequestration driven by inorganic carbon outwelling from mangroves and saltmarshes.Nature Communications,14(1).

Reithmaier，Gloria M.S.,et al."Carbonate chemistry and carbon sequestration driven by inorganic carbon outwelling from mangroves and saltmarshes".Nature Communications 14.1(2023).