Thermodynamic uptake of atmospheric CO2 in the oligotrophic and semiarid S ̃ao Francisco estuary (NE)

Detalhes bibliográficos
Autor(a) principal: Gwenaël, Abril
Data de Publicação: 2021
Outros Autores: Libardoni, Bruno G., Brandini, Nilva, Cotovicz Júnior, Luiz Carlos, Medeiros, Paulo R.P., Cavalcante, Geórgenes H., Knoppers, Bastiaan A.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da Universidade Federal do Ceará (UFC)
Texto Completo: http://www.repositorio.ufc.br/handle/riufc/59895
Resumo: Estuarine carbonate chemistry predicts that thermodynamic equilibration during the mixing of freshwater with seawater will generate a carbon dioxide (CO2) sink in the case of warm and poorly buffered tropical rivers. The S ̃ao Francisco River estuary has historically become oligotrophic after the construction of a series of hydroelectric dams in its watershed, where organic matter and nutrients are retained. During two cruises in late winter (Aug. 2014) and early summer (Nov. 2015), dissolved inorganic carbon (DIC) and total alkalinity (TA) were found to increase linearly with salinity in the main estuarine channel, where water mixing required half a day, and showed nearly conservative behaviour. In the main channel, the water partial pressure of CO2 (pCO2) recorded at a 1-min frequency followed an asymmetric bell-shaped trend versus salinity, similar to the curve predicted by the thermodynamic conservative mixing of freshwater DIC and TA with seawater DIC and TA. The low (0–3) salinity region was always a source of atmospheric CO2, where despite low chlorophyll concentrations, a pCO2 diurnal change of approxi-mately 60 ppmv suggested the occurrence of photosynthesis in summer. At salinities above 3, undersaturated pCO2 values (down to 225 ppmv in winter and neap tides) and invasion of atmospheric CO2 of 0.38–1.70 mmol mL.
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spelling Thermodynamic uptake of atmospheric CO2 in the oligotrophic and semiarid S ̃ao Francisco estuary (NE)Thermodynamic uptake of atmospheric CO2 in the oligotrophic and semiarid S ̃ao Francisco estuary (NE)QuímicaTermodinâmicaEstuarine carbonate chemistry predicts that thermodynamic equilibration during the mixing of freshwater with seawater will generate a carbon dioxide (CO2) sink in the case of warm and poorly buffered tropical rivers. The S ̃ao Francisco River estuary has historically become oligotrophic after the construction of a series of hydroelectric dams in its watershed, where organic matter and nutrients are retained. During two cruises in late winter (Aug. 2014) and early summer (Nov. 2015), dissolved inorganic carbon (DIC) and total alkalinity (TA) were found to increase linearly with salinity in the main estuarine channel, where water mixing required half a day, and showed nearly conservative behaviour. In the main channel, the water partial pressure of CO2 (pCO2) recorded at a 1-min frequency followed an asymmetric bell-shaped trend versus salinity, similar to the curve predicted by the thermodynamic conservative mixing of freshwater DIC and TA with seawater DIC and TA. The low (0–3) salinity region was always a source of atmospheric CO2, where despite low chlorophyll concentrations, a pCO2 diurnal change of approxi-mately 60 ppmv suggested the occurrence of photosynthesis in summer. At salinities above 3, undersaturated pCO2 values (down to 225 ppmv in winter and neap tides) and invasion of atmospheric CO2 of 0.38–1.70 mmol mL.Marine Chemistry2021-08-10T12:04:02Z2021-08-10T12:04:02Z2021info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfABRIL, Gwenaël; LIBARDONI, Bruno G.; BRANDINI, Nilva; COTOVICZ JÚNIOR, LUIZ C.; MEDEIROS, Paulo R. P.; CAVALCANTE, Geórgenes H.; KNOPPERS, Bastiaan A. Thermodynamic uptake of atmospheric CO2 in the oligotrophic and semiarid São Francisco estuary (NE Brazil). Marine Chemistry, Netherlands, v. 233. 2021.0304-4203http://www.repositorio.ufc.br/handle/riufc/59895Gwenaël, AbrilLibardoni, Bruno G.Brandini, NilvaCotovicz Júnior, Luiz CarlosMedeiros, Paulo R.P.Cavalcante, Geórgenes H.Knoppers, Bastiaan A.engreponame:Repositório Institucional da Universidade Federal do Ceará (UFC)instname:Universidade Federal do Ceará (UFC)instacron:UFCinfo:eu-repo/semantics/openAccess2023-01-18T18:16:17Zoai:repositorio.ufc.br:riufc/59895Repositório InstitucionalPUBhttp://www.repositorio.ufc.br/ri-oai/requestbu@ufc.br || repositorio@ufc.bropendoar:2024-09-11T19:00:49.101220Repositório Institucional da Universidade Federal do Ceará (UFC) - Universidade Federal do Ceará (UFC)false
dc.title.none.fl_str_mv Thermodynamic uptake of atmospheric CO2 in the oligotrophic and semiarid S ̃ao Francisco estuary (NE)
Thermodynamic uptake of atmospheric CO2 in the oligotrophic and semiarid S ̃ao Francisco estuary (NE)
title Thermodynamic uptake of atmospheric CO2 in the oligotrophic and semiarid S ̃ao Francisco estuary (NE)
spellingShingle Thermodynamic uptake of atmospheric CO2 in the oligotrophic and semiarid S ̃ao Francisco estuary (NE)
Gwenaël, Abril
Química
Termodinâmica
title_short Thermodynamic uptake of atmospheric CO2 in the oligotrophic and semiarid S ̃ao Francisco estuary (NE)
title_full Thermodynamic uptake of atmospheric CO2 in the oligotrophic and semiarid S ̃ao Francisco estuary (NE)
title_fullStr Thermodynamic uptake of atmospheric CO2 in the oligotrophic and semiarid S ̃ao Francisco estuary (NE)
title_full_unstemmed Thermodynamic uptake of atmospheric CO2 in the oligotrophic and semiarid S ̃ao Francisco estuary (NE)
title_sort Thermodynamic uptake of atmospheric CO2 in the oligotrophic and semiarid S ̃ao Francisco estuary (NE)
author Gwenaël, Abril
author_facet Gwenaël, Abril
Libardoni, Bruno G.
Brandini, Nilva
Cotovicz Júnior, Luiz Carlos
Medeiros, Paulo R.P.
Cavalcante, Geórgenes H.
Knoppers, Bastiaan A.
author_role author
author2 Libardoni, Bruno G.
Brandini, Nilva
Cotovicz Júnior, Luiz Carlos
Medeiros, Paulo R.P.
Cavalcante, Geórgenes H.
Knoppers, Bastiaan A.
author2_role author
author
author
author
author
author
dc.contributor.author.fl_str_mv Gwenaël, Abril
Libardoni, Bruno G.
Brandini, Nilva
Cotovicz Júnior, Luiz Carlos
Medeiros, Paulo R.P.
Cavalcante, Geórgenes H.
Knoppers, Bastiaan A.
dc.subject.por.fl_str_mv Química
Termodinâmica
topic Química
Termodinâmica
description Estuarine carbonate chemistry predicts that thermodynamic equilibration during the mixing of freshwater with seawater will generate a carbon dioxide (CO2) sink in the case of warm and poorly buffered tropical rivers. The S ̃ao Francisco River estuary has historically become oligotrophic after the construction of a series of hydroelectric dams in its watershed, where organic matter and nutrients are retained. During two cruises in late winter (Aug. 2014) and early summer (Nov. 2015), dissolved inorganic carbon (DIC) and total alkalinity (TA) were found to increase linearly with salinity in the main estuarine channel, where water mixing required half a day, and showed nearly conservative behaviour. In the main channel, the water partial pressure of CO2 (pCO2) recorded at a 1-min frequency followed an asymmetric bell-shaped trend versus salinity, similar to the curve predicted by the thermodynamic conservative mixing of freshwater DIC and TA with seawater DIC and TA. The low (0–3) salinity region was always a source of atmospheric CO2, where despite low chlorophyll concentrations, a pCO2 diurnal change of approxi-mately 60 ppmv suggested the occurrence of photosynthesis in summer. At salinities above 3, undersaturated pCO2 values (down to 225 ppmv in winter and neap tides) and invasion of atmospheric CO2 of 0.38–1.70 mmol mL.
publishDate 2021
dc.date.none.fl_str_mv 2021-08-10T12:04:02Z
2021-08-10T12:04:02Z
2021
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv ABRIL, Gwenaël; LIBARDONI, Bruno G.; BRANDINI, Nilva; COTOVICZ JÚNIOR, LUIZ C.; MEDEIROS, Paulo R. P.; CAVALCANTE, Geórgenes H.; KNOPPERS, Bastiaan A. Thermodynamic uptake of atmospheric CO2 in the oligotrophic and semiarid São Francisco estuary (NE Brazil). Marine Chemistry, Netherlands, v. 233. 2021.
0304-4203
http://www.repositorio.ufc.br/handle/riufc/59895
identifier_str_mv ABRIL, Gwenaël; LIBARDONI, Bruno G.; BRANDINI, Nilva; COTOVICZ JÚNIOR, LUIZ C.; MEDEIROS, Paulo R. P.; CAVALCANTE, Geórgenes H.; KNOPPERS, Bastiaan A. Thermodynamic uptake of atmospheric CO2 in the oligotrophic and semiarid São Francisco estuary (NE Brazil). Marine Chemistry, Netherlands, v. 233. 2021.
0304-4203
url http://www.repositorio.ufc.br/handle/riufc/59895
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Marine Chemistry
publisher.none.fl_str_mv Marine Chemistry
dc.source.none.fl_str_mv reponame:Repositório Institucional da Universidade Federal do Ceará (UFC)
instname:Universidade Federal do Ceará (UFC)
instacron:UFC
instname_str Universidade Federal do Ceará (UFC)
instacron_str UFC
institution UFC
reponame_str Repositório Institucional da Universidade Federal do Ceará (UFC)
collection Repositório Institucional da Universidade Federal do Ceará (UFC)
repository.name.fl_str_mv Repositório Institucional da Universidade Federal do Ceará (UFC) - Universidade Federal do Ceará (UFC)
repository.mail.fl_str_mv bu@ufc.br || repositorio@ufc.br
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