Use of 223Ra and 224Ra as chronometers to estimate the residence time of Amazon waters on the Brazilian continental shelf

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dc.contributor.authorLEON, MORGANEpt_BR
dc.contributor.authorBEEK, PIETER vanpt_BR
dc.contributor.authorSCHOLTEN, JANpt_BR
dc.contributor.authorMOORE, WILLARD S.pt_BR
dc.contributor.authorSOUHAUT, MARCpt_BR
dc.contributor.authorOLIVEIRA, JOSELENE dept_BR
dc.contributor.authorJEANDEL, CATHERINEpt_BR
dc.contributor.authorSEYLER, PATRICKpt_BR
dc.contributor.authorJOUANNO, JULIENpt_BR
dc.coverageInternacionalpt_BR
dc.date.accessioned2022-08-09T18:27:56Z
dc.date.available2022-08-09T18:27:56Z
dc.date.issued2022pt_BR
dc.description.abstractWhen rivers mix into the ocean, radium isotopes are released into the dissolved phase allowing us to apply these isotopes as powerful tracers of river plumes spreading into the ocean. We report 223Ra and 224Ra radium activities that were determined in the Amazon River mouth and along the Amazon plume that extends off the coasts of Brazil and French Guyana into the Atlantic Ocean. We summarize 223Ra and 224Ra data from AmasSeds (1991), AMANDES (GEOTRACES process study GApr01; 2007–2008) and M147 (2018) projects, which were conducted in different seasons corresponding to different Amazon discharge rates. We determined the 224Raex/223Ra activity ratios (AR) along the Amazon plume to derive apparent ages and to estimate the residence time of the Amazon waters on the Brazilian continental shelf. Our data suggest that it takes 9–14 d for the Amazon waters to reach the northern continental shelf off French Guyana and 12–21 d to reach the eastern part of the Brazilian continental shelf. These time scales are in good agreement with those derived from a high-resolution numerical simulation of the regional ocean dynamics. We do not find any relationship between the discharge rate of the Amazon River and the residence time of the waters on the Brazilian continental shelf, suggesting that the residence time of the Amazon waters is primarily driven by the ambient northwestward current. Using the apparent ages along the plume, we estimate an average velocity of 26 cm s−1 for the northward transport of the Amazon waters on the continental shelf.pt_BR
dc.format.extent753-767pt_BR
dc.identifier.citationLEON, MORGANE; BEEK, PIETER van; SCHOLTEN, JAN; MOORE, WILLARD S.; SOUHAUT, MARC; OLIVEIRA, JOSELENE de; JEANDEL, CATHERINE; SEYLER, PATRICK; JOUANNO, JULIEN. Use of 223Ra and 224Ra as chronometers to estimate the residence time of Amazon waters on the Brazilian continental shelf. <b>Limnology and Oceanography</b>, v. 67, n. 4, p. 753-767, 2022. DOI: <a href="https://dx.doi.org/10.1002/lno.12010">10.1002/lno.12010</a>. Disponível em: http://repositorio.ipen.br/handle/123456789/33192.
dc.identifier.doi10.1002/lno.12010pt_BR
dc.identifier.fasciculo4pt_BR
dc.identifier.issn0024-3590pt_BR
dc.identifier.percentilfi90.5pt_BR
dc.identifier.percentilfiCiteScore94pt_BR
dc.identifier.urihttp://repositorio.ipen.br/handle/123456789/33192
dc.identifier.vol67pt_BR
dc.relation.ispartofLimnology and Oceanographypt_BR
dc.rightsopenAccesspt_BR
dc.subjectradium 223
dc.subjectradium 224
dc.subjectrivers
dc.subjectplumes
dc.subjectwater pollution
dc.subjectisotopes
dc.subjectamazon river
dc.titleUse of 223Ra and 224Ra as chronometers to estimate the residence time of Amazon waters on the Brazilian continental shelfpt_BR
dc.typeArtigo de periódicopt_BR
dspace.entity.typePublication
ipen.autorJOSELENE DE OLIVEIRA
ipen.codigoautor914
ipen.contributor.ipenauthorJOSELENE DE OLIVEIRA
ipen.date.recebimento22-08
ipen.identifier.fi4.5pt_BR
ipen.identifier.fiCiteScore8.3pt_BR
ipen.identifier.ipendoc28848pt_BR
ipen.identifier.iwosWoSpt_BR
ipen.range.fi4.500 - 5.999
ipen.range.percentilfi75.00 - 100.00
ipen.type.genreArtigo
relation.isAuthorOfPublicationc7b69c7d-5715-4fd4-b554-71f3095131b8
relation.isAuthorOfPublication.latestForDiscoveryc7b69c7d-5715-4fd4-b554-71f3095131b8
sigepi.autor.atividadeOLIVEIRA, JOSELENE de:914:340:Npt_BR
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