Thermodynamic uptake of atmospheric CO2 in the oligotrophic and semiarid S ̃ao Francisco estuary (NE)
Autor(a) principal: | |
---|---|
Data de Publicação: | 2021 |
Outros Autores: | , , , , , |
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. |
id |
UFC-7_91f98e759bf0bc0fe7d77680a0fd2c33 |
---|---|
oai_identifier_str |
oai:repositorio.ufc.br:riufc/59895 |
network_acronym_str |
UFC-7 |
network_name_str |
Repositório Institucional da Universidade Federal do Ceará (UFC) |
repository_id_str |
|
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 |
_version_ |
1813029033345024000 |