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Predominance of phytoplankton-derived dissolved and particulate organic carbon in a highly eutrophic tropical coastal embayment (Guanabara Bay, Rio de Janeiro, Brazil)

dc.rights.licenseopenen_US
hal.structure.identifierDepartamento de Geoquímica
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorCOTOVICZ, Luiz
hal.structure.identifierDepartamento de Geoquímica
dc.contributor.authorKNOPPERS, Bastiaan
hal.structure.identifierLaboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques [LOCEAN]
dc.contributor.authorBRANDINI, Nilva
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorPOIRIER, Dominique
hal.structure.identifierDepartamento de Geoquímica
dc.contributor.authorCOSTA SANTOS, Suzan
hal.structure.identifierDepartamento de Geoquímica
dc.contributor.authorCORDEIRO, Renato
hal.structure.identifierLaboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques [LOCEAN]
hal.structure.identifierDepartamento de Geoquímica
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorABRIL, Gwenaël
dc.date.accessioned2024-04-24T09:57:20Z
dc.date.available2024-04-24T09:57:20Z
dc.date.issued2018-01
dc.identifier.issn0168-2563en_US
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/199302
dc.description.abstractEnWe investigate the carbon dynamics in Guanabara Bay, an eutrophic tropical coastal embayment surrounded by the megacity of Rio de Janeiro (southeast coast of Brazil). Nine sampling campaigns were conducted for dissolved, particulate and total organic carbon (DOC, POC and TOC), dissolved inorganic carbon (DIC), partial pressure of CO2 (pCO2), chlorophyll a (Chl a), pheo-pigments and ancillary parameters. Highest DOC, POC and Chl a concentrations were found in confined-shallow regions of the bay during the summer period with strong pCO2 undersaturation, and DOC reached 82 mg L-1, POC 152 mg L-1, and Chl a 800 lg L-1. Spatially and temporally, POC and DOC concentrations varied positively with total pigments, and negatively with DIC. Strong linear correlations between these parameters indicate that the production of TOC translates to an equivalent uptake in DIC, with 85% of the POC and about 50% of the DOC being of phytoplanktonic origin. Despite the shallow depths of the bay, surface waters were enriched in POC and DOC relative to bottom waters in periods of high thermohaline stratification. The seasonal accumulation of phytoplankton-derived TOC in the surface waters reached about 105 g C m-2 year-1, representing between 8 and 40% of the net primary production. The calculated turnover time of organic carbon was 117 and 34 days during winter and summer, respectively. Our results indicate that eutrophication of coastal bays in the tropics can generate large stocks of planktonic biomass and detrital organic carbon which are permanently being produced and partially degraded and buried in sediments.
dc.language.isoENen_US
dc.subject.enEutrophication
dc.subject.enCarbon dynamics
dc.subject.enOrganic carbon
dc.subject.enMarine carbonate system
dc.subject.enSoutheastern coast of Brazil
dc.title.enPredominance of phytoplankton-derived dissolved and particulate organic carbon in a highly eutrophic tropical coastal embayment (Guanabara Bay, Rio de Janeiro, Brazil)
dc.typeArticle de revueen_US
dc.identifier.doi10.1007/s10533-017-0405-yen_US
dc.subject.halPhysique [physics]/Physique [physics]/Géophysique [physics.geo-ph]en_US
dc.subject.halSciences de l'environnement/Milieux et Changements globauxen_US
bordeaux.journalBiogeochemistryen_US
bordeaux.page1 - 14en_US
bordeaux.volume137en_US
bordeaux.hal.laboratoriesEPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805en_US
bordeaux.issue1-2en_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionCNRSen_US
bordeaux.teamECOBIOCen_US
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
bordeaux.import.sourcehal
hal.identifierhal-01832159
hal.version1
hal.popularnonen_US
hal.audienceInternationaleen_US
hal.exportfalse
workflow.import.sourcehal
dc.rights.ccPas de Licence CCen_US
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Biogeochemistry&rft.date=2018-01&rft.volume=137&rft.issue=1-2&rft.spage=1%20-%2014&rft.epage=1%20-%2014&rft.eissn=0168-2563&rft.issn=0168-2563&rft.au=COTOVICZ,%20Luiz&KNOPPERS,%20Bastiaan&BRANDINI,%20Nilva&POIRIER,%20Dominique&COSTA%20SANTOS,%20Suzan&rft.genre=article


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