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

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Listed:
  • Gloria M. S. Reithmaier

    (University of Gothenburg)

  • Alex Cabral

    (University of Gothenburg)

  • Anirban Akhand

    (Hong Kong University of Science and Technology
    Port and Airport Research Institute)

  • Matthew J. Bogard

    (University of Lethbridge)

  • Alberto V. Borges

    (University of Liège)

  • Steven Bouillon

    (KU Leuven)

  • David J. Burdige

    (Old Dominion University)

  • Mitchel Call

    (Southern Cross University)

  • Nengwang Chen

    (Xiamen University)

  • Xiaogang Chen

    (Westlake University)

  • Luiz C. Cotovicz

    (Leibniz Institute for Baltic Sea Research
    Federal University of Ceará (UFC))

  • Meagan J. Eagle

    (U.S. Geological Survey)

  • Erik Kristensen

    (University of Southern Denmark)

  • Kevin D. Kroeger

    (U.S. Geological Survey)

  • Zeyang Lu

    (Xiamen University)

  • Damien T. Maher

    (Southern Cross University)

  • J. Lucas Pérez-Lloréns

    (University of Cádiz)

  • Raghab Ray

    (The University of Tokyo)

  • Pierre Taillardat

    (National University of Singapore)

  • Joseph J. Tamborski

    (Old Dominion University)

  • Rob C. Upstill-Goddard

    (Newcastle University)

  • Faming Wang

    (Chinese Academy of Sciences)

  • Zhaohui Aleck Wang

    (Woods Hole Oceanographic Institution)

  • Kai Xiao

    (Southern University of Science and Technology)

  • Yvonne Y. Y. Yau

    (University of Gothenburg)

  • Isaac R. Santos

    (University of Gothenburg)

Abstract

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−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.

Suggested Citation

  • Gloria M. S. Reithmaier & Alex Cabral & Anirban Akhand & Matthew J. Bogard & Alberto V. Borges & Steven Bouillon & David J. Burdige & Mitchel Call & Nengwang Chen & Xiaogang Chen & Luiz C. Cotovicz & , 2023. "Carbonate chemistry and carbon sequestration driven by inorganic carbon outwelling from mangroves and saltmarshes," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-44037-w
    DOI: 10.1038/s41467-023-44037-w
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    References listed on IDEAS

    as
    1. Bunting, P. & Rosenqvist, A. & Lucas, R. M. & Rebelo, Lisa-Maria & Thomas, N. & Hardy, A. & Itoh, T. & Shimada, M. & Finlayson, C. M., 2018. "The global mangrove watch - a New 2010 global baseline of mangrove extent," Papers published in Journals (Open Access), International Water Management Institute, pages 10(10):1-19.
    2. Wei-Jun Cai & Yuan-Yuan Xu & Richard A. Feely & Rik Wanninkhof & Bror Jönsson & Simone R. Alin & Leticia Barbero & Jessica N. Cross & Kumiko Azetsu-Scott & Andrea J. Fassbender & Brendan R. Carter & L, 2020. "Controls on surface water carbonate chemistry along North American ocean margins," Nature Communications, Nature, vol. 11(1), pages 1-13, December.
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