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Novel field experiment on alkalinity enhancement in intertidal environments—a trailblazer for natural climate solutions

2025-02-27Journal article Open access
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dc.contributor.authorMendes, Isabel Maria de Paiva Pinto
dc.contributor.authorLübbers, J.
dc.contributor.authorSchönfeld, J.
dc.contributor.authorBaldermann, A.
dc.contributor.authorCarrasco, A. Rita
dc.contributor.authorCravo, Alexandra
dc.contributor.authorGomes, Ana
dc.contributor.authorGrasse, P.
dc.contributor.authorStamm, F. M.
dc.date.accessioned2025-03-20T14:17:32Z
dc.date.available2025-03-20T14:17:32Z
dc.date.issued2025-02-27
dc.description.abstractOne recently proposed approach to reduce atmospheric CO2 concentrations is marine alkalinity enhancement. This technique increases the CO2 uptake capacity of seawater through weathering of fine-grained (mafic) rocks and minerals in marine environments. The weathering process has been extensively tested in laboratory studies and verified by numerical models. Field experiments scaling the CO2 uptake under natural conditions are still lacking. In a methodological approach, a novel in situ experiment was designed and installed in a salt marsh at Ria Formosa coastal lagoon, southern Portugal. The experiment comprised deployments of different sizes of olivine and basalt substrates, and a control site, which were tidally submerged twice a day. A monthly monitoring scheme of supernatant and porewater properties from each deployment and control site was established, and procedures for temperature, salinity, oxygen, pH, total alkalinity, nutrient, and trace metal analyses were defined. This paper is devoted to the methods and describes the design, a protocol for the analyses, and an evaluation of experimental performance and reliability. Data from the first 6 months are presented for validation of the experiment. They demonstrated elevated total alkalinity in water samples, mostly in porewater after the deployments, while salinity, oxygen, and pH reflect the control conditions. Significant alkalinity differences were observed between the treatments and the natural background conditions monitored at the control site, during the 6 months of the experiment. The methodological approach is presented with strengths, limitations, and recommendations for an upscaling as CO2 removal measure, servicing, and subsequent investigations.eng
dc.description.sponsorshipPTDC/CTA-CLI/1065/2021; CEECINST/00052/2021/CP2792/CT0012; CEECINST/00052/2021/CP2792/CT0007; CEECINST/00146/2018/CP1493/CT0002; S-026426/2022
dc.identifier.doi10.1029/2024jg008591
dc.identifier.eissn2169-8961
dc.identifier.issn2169-8953
dc.identifier.urihttp://hdl.handle.net/10400.1/26935
dc.language.isoeng
dc.peerreviewedyes
dc.publisherAmerican Geophysical Union (AGU)
dc.relationCentre for Marine and Environmental Research (CIMA)
dc.relationAquatic Research Infrastructure Network
dc.relation.ispartofJournal of Geophysical Research: Biogeosciences
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectEnhanced weathering
dc.subjectTotal alkalinity
dc.subjectSalt marsh
dc.subjectMafic minerals
dc.subjectClimate mitigation
dc.titleNovel field experiment on alkalinity enhancement in intertidal environments—a trailblazer for natural climate solutionseng
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleCentre for Marine and Environmental Research (CIMA)
oaire.awardTitleAquatic Research Infrastructure Network
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F00350%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/LA%2FP%2F0069%2F2020/PT
oaire.citation.issue3
oaire.citation.startPagee2024JG008591
oaire.citation.titleJournal of Geophysical Research: Biogeosciences
oaire.citation.volume130
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStream6817 - DCRRNI ID
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
person.familyNameMendes
person.familyNameCarrasco
person.familyNameCravo
person.familyNameGomes
person.givenNameIsabel Maria de Paiva Pinto
person.givenNameA. Rita
person.givenNameAlexandra
person.givenNameAna
person.identifier545203
person.identifier.ciencia-id5C15-242C-FDC0
person.identifier.ciencia-idA31E-1703-4030
person.identifier.ciencia-id7419-EE20-8039
person.identifier.ciencia-id331B-BA33-96A6
person.identifier.orcid0000-0001-7004-7910
person.identifier.orcid0000-0002-8980-0068
person.identifier.orcid0000-0002-2569-3929
person.identifier.orcid0000-0002-9793-4816
person.identifier.ridD-2235-2016
person.identifier.ridC-3969-2015
person.identifier.scopus-author-id15724386100
person.identifier.scopus-author-id56346514200
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
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