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A strong CO2 sink enhanced by eutrophication in a tropical coastal embayment (Guanabara Bay, Rio de Janeiro, Brazil)

dc.rights.licenseopenen_US
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorCOTOVICZ, Luiz Carlos
dc.contributor.authorKNOPPERS, Bastiaan Adriaan
dc.contributor.authorBRANDINI, Nilva
dc.contributor.authorCOSTA SANTOS, Suzan J.
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorABRIL, Gwenaël
dc.date.accessioned2024-05-14T13:35:22Z
dc.date.available2024-05-14T13:35:22Z
dc.date.issued2015-10-01
dc.identifier.issn1726-4170en_US
dc.identifier.urihttps://www.researchgate.net/publication/283503923_A_strong_CO2_sink_enhanced_by_eutrophication_in_a_tropical_coastal_embayment_Guanabara_Bay_Rio_de_Janeiro_Brazil
dc.identifier.urioai:crossref.org:10.5194/bg-12-6125-2015
dc.identifier.urioai:researchgate.net:283503923
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/199834
dc.description.abstractEnAbstract. In contrast to its small surface area, the coastal zone plays a disproportionate role in the global carbon cycle. Carbon production, transformation, emission and burial rates at the land–ocean interface are significant at the global scale but still poorly known, especially in tropical regions. Surface water pCO2 and ancillary parameters were monitored during nine field campaigns between April 2013 and April 2014 in Guanabara Bay, a tropical eutrophic to hypertrophic semi-enclosed estuarine embayment surrounded by the city of Rio de Janeiro, southeast Brazil. Water pCO2 varied between 22 and 3715 ppmv in the bay, showing spatial, diurnal and seasonal trends that mirrored those of dissolved oxygen (DO) and chlorophyll a (Chl a). Marked pCO2 undersaturation was prevalent in the shallow, confined and thermally stratified waters of the upper bay, whereas pCO2 oversaturation was restricted to sites close to the small river mouths and small sewage channels, which covered only 10 % of the bay's area. Substantial daily variations in pCO2 (up to 395 ppmv between dawn and dusk) were also registered and could be integrated temporally and spatially for the establishment of net diurnal, seasonal and annual CO2 fluxes. In contrast to other estuaries worldwide, Guanabara Bay behaved as a net sink of atmospheric CO2, a property enhanced by the concomitant effects of strong radiation intensity, thermal stratification, and high availability of nutrients, which promotes phytoplankton development and net autotrophy. The calculated CO2 fluxes for Guanabara Bay ranged between −9.6 and −18.3 mol C m−2 yr−1, of the same order of magnitude as the organic carbon burial and organic carbon inputs from the watershed. The positive and high net community production (52.1 mol C m−2 yr−1) confirms the high carbon production in the bay. This autotrophic metabolism is apparently enhanced by eutrophication. Our results show that global CO2 budgetary assertions still lack information on tropical, marine-dominated estuarine systems, which are affected by thermal stratification and eutrophication and behave specifically with respect to atmospheric CO2.
dc.language.isoENen_US
dc.sourcecrossref
dc.sourceresearchgate
dc.title.enA strong CO2 sink enhanced by eutrophication in a tropical coastal embayment (Guanabara Bay, Rio de Janeiro, Brazil)
dc.typeArticle de revueen_US
dc.identifier.doi10.5194/bg-12-6125-2015en_US
dc.subject.halSciences de l'environnementen_US
bordeaux.journalBiogeosciencesen_US
bordeaux.page6125-6146en_US
bordeaux.volume12en_US
bordeaux.hal.laboratoriesEPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805en_US
bordeaux.issue20en_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionCNRSen_US
bordeaux.teamECOBIOCen_US
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
bordeaux.import.sourcedissemin
hal.identifierhal-04574971
hal.version1
hal.date.transferred2024-05-14T13:35:24Z
hal.popularnonen_US
hal.audienceInternationaleen_US
hal.exporttrue
workflow.import.sourcedissemin
dc.rights.ccCC BYen_US
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Biogeosciences&rft.date=2015-10-01&rft.volume=12&rft.issue=20&rft.spage=6125-6146&rft.epage=6125-6146&rft.eissn=1726-4170&rft.issn=1726-4170&rft.au=COTOVICZ,%20Luiz%20Carlos&KNOPPERS,%20Bastiaan%20Adriaan&BRANDINI,%20Nilva&COSTA%20SANTOS,%20Suzan%20J.&ABRIL,%20Gwena%C3%ABl&rft.genre=article


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