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Anthropogenic CO2 and ocean acidification in Argentine Basin water masses over almost five decades of observations

2021-07Journal article Open access
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dc.contributor.authorFontela, Marcos
dc.contributor.authorVelo, Antón
dc.contributor.authorGilcoto, Miguel
dc.contributor.authorPérez, Fiz F.
dc.date.accessioned2021-06-22T18:26:46Z
dc.date.available2021-06-22T18:26:46Z
dc.date.issued2021-07
dc.description.abstractThe chemical conditions of the Argentine Basin (western South Atlantic Ocean) water masses are evaluated with measurements from eleven hydrographic cruises to detect and quantify anthropogenic and natural stressors in the ocean carbon system. The database covers almost half-century (1972-2019), a time-span where the mean annual atmospheric carbon dioxide concentration (CO2atm) increased from 325 to 408 ppm of volume (ppm). This increase of atmospheric CO2 (83 ppm, the 64% of the total anthropogenic signal in the atmosphere) leads to an increase in anthropogenic carbon (Cant) across all the water column and the consequent ocean acidification: a decrease in excess carbonate that is unequivocal in the upper (South Atlantic Central Water, SACW) and intermediate water masses (Sub Antarctic Mode Water, SAMW and Antarctic Intermediate Water, AAIW). For each additional ppm in CO2atm the water masses SACW, SAMW and AAIW lose excess carbonate at a rate of 0.39 ± 0.04, 0.47 ± 0.05 and 0.23 ± 0.03 μmol·kg-1·ppm-1 respectively. Modal and intermediate water masses in the Argentine Basin are very sensitive to carbon increases due low buffering capacity. The large rate of AAIW acidification is the synergic effect of carbon uptake combined with deoxygenation and increased remineralization of organic matter. If CO2 emissions follows the path of business-as-usual emissions (SSP 5.85), SACW would become undersaturated with respect to aragonite at the end of the century. The undersaturation in AAIW is virtually unavoidable.pt_PT
dc.description.sponsorshipUIDB/Multi/04326/2020, CEECINST/00114/2018, PID2019-104279GB-C21,pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.1016/j.scitotenv.2021.146570pt_PT
dc.identifier.eissn1879-1026
dc.identifier.issn0048-9697
dc.identifier.urihttp://hdl.handle.net/10400.1/16339
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relationOur common future ocean in the Earth system – quantifying coupled cycles of carbon, oxygen, and nutrients for determining and achieving safe operating spaces with respect to tipping points
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectOcean acidificationpt_PT
dc.subjectAnthropogenic carbonpt_PT
dc.subjectCarbonatept_PT
dc.subjectDeoxygenationpt_PT
dc.subjectArgentine basinpt_PT
dc.subjectWestern South Atlanticpt_PT
dc.titleAnthropogenic CO2 and ocean acidification in Argentine Basin water masses over almost five decades of observationspt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleOur common future ocean in the Earth system – quantifying coupled cycles of carbon, oxygen, and nutrients for determining and achieving safe operating spaces with respect to tipping points
oaire.awardURIinfo:eu-repo/grantAgreement/EC/H2020/820989/EU
oaire.citation.startPage146570pt_PT
oaire.citation.titleScience of The Total Environmentpt_PT
oaire.citation.volume779pt_PT
oaire.fundingStreamH2020
person.familyNameMorente Fontela
person.givenNameMarcos
person.identifiers21hYoYAAAAJ&hl
person.identifier.ciencia-idF312-A970-8A93
person.identifier.orcid0000-0002-7486-0922
project.funder.identifierhttp://doi.org/10.13039/501100008530
project.funder.nameEuropean Commission
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublicationae5042ff-ec36-4de3-a262-0e448c0bf0d9
relation.isAuthorOfPublication.latestForDiscoveryae5042ff-ec36-4de3-a262-0e448c0bf0d9
relation.isProjectOfPublicationab67e6fa-87a6-47e6-9e7d-8eeb6cf1ac43
relation.isProjectOfPublication.latestForDiscoveryab67e6fa-87a6-47e6-9e7d-8eeb6cf1ac43

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