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

Vincent Saderne; Marco Fusi; Timothy Thomson; Aislinn Dunne; Fatima Mahmud; Florian Roth; Susana Carvalho; Carlos M. Duarte

doi:10.1002/lol2.10170

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

Vincent Saderne, Marco Fusi, Timothy Thomson, Aislinn Dunne, Fatima Mahmud, Florian Roth, Susana Carvalho, Carlos M. Duarte

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

36 Scopus citations

Abstract

Mangroves have the capacity to sequester organic carbon (Corg) 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 Corg burial rate of 15 gC m−2 yr−1. The focus on Corg burial in sediments may substantially underestimate the role of mangroves in CO2 removal. Quantifying the role of mangroves in climate change mitigation requires carbonate dissolution to be included in assessments.

Original language	English (US)
Journal	Limnology And Oceanography Letters
DOIs	https://doi.org/10.1002/lol2.10170
State	Published - Oct 16 2020

Bibliographical note

KAUST Repository Item: Exported on 2020-10-19
Acknowledgements: We thank M. Predragovic, W. Rich IV, U. Langner, J. L. Curdia, R. Cadiz, and M. Ennasri for their help in the field and the lab. This research was supported by King Abdullah University of Science and Technology (KAUST) baseline funding to C.M.D. and the KAUST Circular Carbon Economy initiative.

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10.1002/lol2.10170

https://repository.kaust.edu.sa/bitstream/10754/665625/1/lol2.10170%20%281%29.pdf

Cite this

@article{b9e52c0e7c234c5fbd8c100d53a6dba1,

title = "Total alkalinity production in a mangrove ecosystem reveals an overlooked Blue Carbon component",

abstract = "Mangroves have the capacity to sequester organic carbon (Corg) 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 Corg burial rate of 15 gC m−2 yr−1. The focus on Corg burial in sediments may substantially underestimate the role of mangroves in CO2 removal. Quantifying the role of mangroves in climate change mitigation requires carbonate dissolution to be included in assessments.",

author = "Vincent Saderne and Marco Fusi and Timothy Thomson and Aislinn Dunne and Fatima Mahmud and Florian Roth and Susana Carvalho and Duarte, {Carlos M.}",

note = "KAUST Repository Item: Exported on 2020-10-19 Acknowledgements: We thank M. Predragovic, W. Rich IV, U. Langner, J. L. Curdia, R. Cadiz, and M. Ennasri for their help in the field and the lab. This research was supported by King Abdullah University of Science and Technology (KAUST) baseline funding to C.M.D. and the KAUST Circular Carbon Economy initiative.",

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doi = "10.1002/lol2.10170",

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T1 - Total alkalinity production in a mangrove ecosystem reveals an overlooked Blue Carbon component

AU - Saderne, Vincent

AU - Fusi, Marco

AU - Thomson, Timothy

AU - Dunne, Aislinn

AU - Mahmud, Fatima

AU - Roth, Florian

AU - Carvalho, Susana

AU - Duarte, Carlos M.

N1 - KAUST Repository Item: Exported on 2020-10-19 Acknowledgements: We thank M. Predragovic, W. Rich IV, U. Langner, J. L. Curdia, R. Cadiz, and M. Ennasri for their help in the field and the lab. This research was supported by King Abdullah University of Science and Technology (KAUST) baseline funding to C.M.D. and the KAUST Circular Carbon Economy initiative.

PY - 2020/10/16

Y1 - 2020/10/16

N2 - Mangroves have the capacity to sequester organic carbon (Corg) 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 Corg burial rate of 15 gC m−2 yr−1. The focus on Corg burial in sediments may substantially underestimate the role of mangroves in CO2 removal. Quantifying the role of mangroves in climate change mitigation requires carbonate dissolution to be included in assessments.

AB - Mangroves have the capacity to sequester organic carbon (Corg) 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 Corg burial rate of 15 gC m−2 yr−1. The focus on Corg burial in sediments may substantially underestimate the role of mangroves in CO2 removal. Quantifying the role of mangroves in climate change mitigation requires carbonate dissolution to be included in assessments.

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UR - https://onlinelibrary.wiley.com/doi/10.1002/lol2.10170

U2 - 10.1002/lol2.10170

DO - 10.1002/lol2.10170

M3 - Article

SN - 2378-2242

JO - Limnology And Oceanography Letters

JF - Limnology And Oceanography Letters

ER -

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

Abstract

Bibliographical note

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