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White is a new shade of blue carbon: a case study of a traditional salt production pond that is a net carbon sink

2026-05Artigo científico Acesso aberto
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datacite.subject.sdg13:Ação Climática
datacite.subject.sdg14:Proteger a Vida Marinha
datacite.subject.sdg15:Proteger a Vida Terrestre
dc.contributor.authorAlexandre, Ana
dc.contributor.authorBarrena de los Santos, Carmen
dc.contributor.authorJiménez Herrero, Javier
dc.contributor.authorDeguette, Alizé
dc.contributor.authorSilva, João
dc.contributor.authorMartins, Márcio
dc.contributor.authorParreira, Filipe
dc.contributor.authorSchubert, Nadine
dc.contributor.authorRosa, Saray P. de la
dc.contributor.authorSantos, Rui
dc.date.accessioned2026-06-23T13:26:19Z
dc.date.available2026-06-23T13:26:19Z
dc.date.issued2026-05
dc.description.abstractTo address for the first time the carbon budget of traditional salterns, we measured the diel, seasonal, and spatial variability of water‐air CO2‐eq fluxes (CH4 and CO2) and the Organic Carbon (OC) stock and burial rate in the sediment. Temperature, salinity, dissolved oxygen, pH and wind were assessed as potential environmental drivers of the fluxes. The saltern emitted CH4 to the atmosphere throughout the year, with no significant differences among sites or seasons. On the contrary, the saltern were a sink of CO2 in summer, autumn and winter, and a source of CO2 in spring. Water temperature was the main positively related predictor variable of CH4 fluxes, explaining 29% of their variance, whereas CO2 fluxes were significantly negatively related to the concentration of O2 and pH in the seawater and positively related to wind, which explained 66% of fluxes variance. The sedimentary and OC stocks and burial rates were not significantly different among the sampled ponds and averaged 11.9 ± 2.2 Mg OC ha− 1 and 0.011 ± 0.004 Mg OC ha− 1 yr− 1 , respectively. The carbon budget of the saltern was − 35.0 g CO2‐eq m− 2 yr− 1 , corresponding to − 1.49 Mg CO2‐eq yr− 1 for the total saltern area. This suggests that the‐salt industry may function as a carbon sink as opposed to other coastal industries such as fish and shrimp aquaculture. Future studies with additional measurements across a wider range of salterns are needed to evaluate the relevance of “white carbon.”eng
dc.description.sponsorshipUID/04326/2025; UID/PRR/04326/2025
dc.identifier.doi10.1029/2025jg009016
dc.identifier.eissn2169-8961
dc.identifier.issn2169-8953
dc.identifier.urihttp://hdl.handle.net/10400.1/29125
dc.language.isoeng
dc.peerreviewedyes
dc.publisherAmerican Geophysical Union (AGU)
dc.relationCentre for Marine and Environmental Research
dc.relation.ispartofJournal of Geophysical Research: Biogeosciences
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.titleWhite is a new shade of blue carbon: a case study of a traditional salt production pond that is a net carbon sinkeng
dc.typejournal article
dspace.entity.typePublication
oaire.awardNumberLA/P/0101/2020
oaire.awardTitleCentre for Marine and Environmental Research
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/LA%2FP%2F0101%2F2020/PT
oaire.citation.issue5
oaire.citation.titleJournal of Geophysical Research: Biogeosciences
oaire.citation.volume131
oaire.fundingStream6817 - DCRRNI ID
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
person.familyNameAlexandre
person.familyNameBarrena de los Santos
person.familyNameJiménez Herrero
person.familyNameDeguette
person.familyNameSilva
person.familyNameMartins
person.familyNameParreira
person.familyNameSchubert
person.familyNameSantos
person.givenNameAna
person.givenNameCarmen
person.givenNameJavier
person.givenNameAlizé
person.givenNameJoão
person.givenNameMárcio
person.givenNameFilipe
person.givenNameNadine
person.givenNameRui
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project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
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