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

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; Meagan J. Eagle; Erik Kristensen; Kevin D. Kroeger; Zeyang Lu; Damien T. Maher; J. Lucas Pérez-Lloréns; Raghab Ray; Pierre Taillardat; Joseph J. Tamborski; Rob C. Upstill-Goddard; Faming Wang; Zhaohui Aleck Wang; Kai Xiao; Yvonne Y.Y. Yau; Isaac R. Santos

doi:10.1038/s41467-023-44037-w

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

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, Meagan J. Eagle, Erik Kristensen, Kevin D. Kroeger, Zeyang Lu, Damien T. Maher, J. Lucas Pérez-Lloréns, Raghab Ray, Pierre Taillardat, Joseph J. TamborskiRob C. Upstill-Goddard, Faming Wang, Zhaohui Aleck Wang, Kai Xiao, Yvonne Y.Y. Yau, Isaac R. Santos

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

50 Citations (Scopus)

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.

Original language	English
Article number	8196
Journal	Nature Communications
Volume	14
Issue number	1
DOIs	https://doi.org/10.1038/s41467-023-44037-w
Publication status	Published - Dec 2023
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2023, The Author(s).

ASJC Scopus Subject Areas

General Chemistry
General Biochemistry,Genetics and Molecular Biology
General Physics and Astronomy

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Reithmaier, G. M. S., Cabral, A., Akhand, A., Bogard, M. J., Borges, A. V., Bouillon, S., Burdige, D. J., Call, M., Chen, N., Chen, X., Cotovicz, L. C., Eagle, M. J., Kristensen, E., Kroeger, K. D., Lu, Z., Maher, D. T., Pérez-Lloréns, J. L., Ray, R., Taillardat, P., ... Santos, I. R. (2023). Carbonate chemistry and carbon sequestration driven by inorganic carbon outwelling from mangroves and saltmarshes. Nature Communications, 14(1), Article 8196. https://doi.org/10.1038/s41467-023-44037-w

@article{db887fe84e9541f0b0482ff868bbca1d,

title = "Carbonate chemistry and carbon sequestration driven by inorganic carbon outwelling from mangroves and saltmarshes",

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.",

author = "Reithmaier, {Gloria M.S.} and Alex Cabral and Anirban Akhand and Bogard, {Matthew J.} and Borges, {Alberto V.} and Steven Bouillon and Burdige, {David J.} and Mitchel Call and Nengwang Chen and Xiaogang Chen and Cotovicz, {Luiz C.} and Eagle, {Meagan J.} and Erik Kristensen and Kroeger, {Kevin D.} and Zeyang Lu and Maher, {Damien T.} and P{\'e}rez-Llor{\'e}ns, {J. Lucas} and Raghab Ray and Pierre Taillardat and Tamborski, {Joseph J.} and Upstill-Goddard, {Rob C.} and Faming Wang and Wang, {Zhaohui Aleck} and Kai Xiao and Yau, {Yvonne Y.Y.} and Santos, {Isaac R.}",

note = "Publisher Copyright: {\textcopyright} 2023, The Author(s).",

year = "2023",

month = dec,

doi = "10.1038/s41467-023-44037-w",

language = "English",

volume = "14",

journal = "Nature Communications",

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Reithmaier, GMS, Cabral, A, Akhand, A, Bogard, MJ, Borges, AV, Bouillon, S, Burdige, DJ, Call, M, Chen, N, Chen, X, Cotovicz, LC, Eagle, MJ, Kristensen, E, Kroeger, KD, Lu, Z, Maher, DT, Pérez-Lloréns, JL, Ray, R, Taillardat, P, Tamborski, JJ, Upstill-Goddard, RC, Wang, F, Wang, ZA, Xiao, K, Yau, YYY & Santos, IR 2023, 'Carbonate chemistry and carbon sequestration driven by inorganic carbon outwelling from mangroves and saltmarshes', Nature Communications, vol. 14, no. 1, 8196. https://doi.org/10.1038/s41467-023-44037-w

TY - JOUR

T1 - Carbonate chemistry and carbon sequestration driven by inorganic carbon outwelling from mangroves and saltmarshes

AU - Reithmaier, Gloria M.S.

AU - Cabral, Alex

AU - Akhand, Anirban

AU - Bogard, Matthew J.

AU - Borges, Alberto V.

AU - Bouillon, Steven

AU - Burdige, David J.

AU - Call, Mitchel

AU - Chen, Nengwang

AU - Chen, Xiaogang

AU - Cotovicz, Luiz C.

AU - Eagle, Meagan J.

AU - Kristensen, Erik

AU - Kroeger, Kevin D.

AU - Lu, Zeyang

AU - Maher, Damien T.

AU - Pérez-Lloréns, J. Lucas

AU - Ray, Raghab

AU - Taillardat, Pierre

AU - Tamborski, Joseph J.

AU - Upstill-Goddard, Rob C.

AU - Wang, Faming

AU - Wang, Zhaohui Aleck

AU - Xiao, Kai

AU - Yau, Yvonne Y.Y.

AU - Santos, Isaac R.

PY - 2023/12

Y1 - 2023/12

N2 - 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.

AB - 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.

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VL - 14

JO - Nature Communications

JF - Nature Communications

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ER -

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

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