Assessment of carbon fluxes to coastal area during persistent drought conditions

Detalhes bibliográficos
Autor(a) principal: Cavalcante, Mariany Sousa
Data de Publicação: 2022
Outros Autores: Marins, Rozane Valente, Dias, Francisco José da Silva, Rezende, Carlos Eduardo de
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/63525
Resumo: This study assesses the seasonal and hydrological factors controlling carbon fluxes and quality of organic matter through the maximum turbidity zone (MTZ) of a tropical semiarid estuary under extreme drought, the Jaguaribe River estuary located in northeast Brazil. Dissolved organic carbon (DOC) and particulate organic carbon (POC) concentrations decreased in the Jaguaribe River estuary during the past ten years, reflecting drought intensification and river damming. DOC and POC behavior were strongly correlated to the freshwater residence time and freshwater fraction. Correlations with Chl-a indicated that the biological activity did not regulate DOC but did POC. Stable isotope ratios (δ13C and δ15N) of POC showed that it was predominantly terrestrial-derived, suggesting mangrove as an important POC source. Dissolved inorganic carbon concentrations reflected the seasonal variability of the semiarid climate, being higher in the dry season due to the negative water balance during this period. The Jaguaribe River estuary’s MTZ behaved as a retainer of POC (-1.5 ± 0.2 × 104 tons.year−1), DOC (-1.0 × 105 tons.year−1) and DIC (-4.8 ± 3.3 × 105 tons.year−1) during the dry season and as an exporter of DOC (+ 2 x 104 tons.year−1) and DIC (+1.4 × 105 tons.year−1) in the rainy season. However, the reduced freshwater supply to the estuary resulted in carbon concentrations 50% lower than those reported in 2004 and carbon fluxes smaller than expected for a tropical region. This study indicates that, under a scenario of climatic changes, the intensification of droughts in NE Brazil can further increase carbon retention in the estuary, reducing its exportation to the ocean
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spelling Assessment of carbon fluxes to coastal area during persistent drought conditionsDissolved inorganic carbonMangrooveParticulate organic carbonCarbono inorgânico- dissoluçãoMangueCarbono Orgânico-dissoluçãoThis study assesses the seasonal and hydrological factors controlling carbon fluxes and quality of organic matter through the maximum turbidity zone (MTZ) of a tropical semiarid estuary under extreme drought, the Jaguaribe River estuary located in northeast Brazil. Dissolved organic carbon (DOC) and particulate organic carbon (POC) concentrations decreased in the Jaguaribe River estuary during the past ten years, reflecting drought intensification and river damming. DOC and POC behavior were strongly correlated to the freshwater residence time and freshwater fraction. Correlations with Chl-a indicated that the biological activity did not regulate DOC but did POC. Stable isotope ratios (δ13C and δ15N) of POC showed that it was predominantly terrestrial-derived, suggesting mangrove as an important POC source. Dissolved inorganic carbon concentrations reflected the seasonal variability of the semiarid climate, being higher in the dry season due to the negative water balance during this period. The Jaguaribe River estuary’s MTZ behaved as a retainer of POC (-1.5 ± 0.2 × 104 tons.year−1), DOC (-1.0 × 105 tons.year−1) and DIC (-4.8 ± 3.3 × 105 tons.year−1) during the dry season and as an exporter of DOC (+ 2 x 104 tons.year−1) and DIC (+1.4 × 105 tons.year−1) in the rainy season. However, the reduced freshwater supply to the estuary resulted in carbon concentrations 50% lower than those reported in 2004 and carbon fluxes smaller than expected for a tropical region. This study indicates that, under a scenario of climatic changes, the intensification of droughts in NE Brazil can further increase carbon retention in the estuary, reducing its exportation to the oceanRegional Studies in Marine Science2022-01-17T13:54:00Z2022-01-17T13:54:00Z2022info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfCAVALCANTE, Mariany Sousa; MARIS, Rozane Valente; DIAS, Francisco José da Silva; REZENDE, Carlos Eduardo de. Assessment of carbon fluxes to coastal area during persistent drought conditions. Regional Studies in Marine Science, v. 47, 2021.2352-4855http://www.repositorio.ufc.br/handle/riufc/63525Cavalcante, Mariany SousaMarins, Rozane ValenteDias, Francisco José da SilvaRezende, Carlos Eduardo deengreponame:Repositório Institucional da Universidade Federal do Ceará (UFC)instname:Universidade Federal do Ceará (UFC)instacron:UFCinfo:eu-repo/semantics/openAccess2023-01-17T14:20:25Zoai:repositorio.ufc.br:riufc/63525Repositório InstitucionalPUBhttp://www.repositorio.ufc.br/ri-oai/requestbu@ufc.br || repositorio@ufc.bropendoar:2024-09-11T18:40:30.308893Repositório Institucional da Universidade Federal do Ceará (UFC) - Universidade Federal do Ceará (UFC)false
dc.title.none.fl_str_mv Assessment of carbon fluxes to coastal area during persistent drought conditions
title Assessment of carbon fluxes to coastal area during persistent drought conditions
spellingShingle Assessment of carbon fluxes to coastal area during persistent drought conditions
Cavalcante, Mariany Sousa
Dissolved inorganic carbon
Mangroove
Particulate organic carbon
Carbono inorgânico- dissolução
Mangue
Carbono Orgânico-dissolução
title_short Assessment of carbon fluxes to coastal area during persistent drought conditions
title_full Assessment of carbon fluxes to coastal area during persistent drought conditions
title_fullStr Assessment of carbon fluxes to coastal area during persistent drought conditions
title_full_unstemmed Assessment of carbon fluxes to coastal area during persistent drought conditions
title_sort Assessment of carbon fluxes to coastal area during persistent drought conditions
author Cavalcante, Mariany Sousa
author_facet Cavalcante, Mariany Sousa
Marins, Rozane Valente
Dias, Francisco José da Silva
Rezende, Carlos Eduardo de
author_role author
author2 Marins, Rozane Valente
Dias, Francisco José da Silva
Rezende, Carlos Eduardo de
author2_role author
author
author
dc.contributor.author.fl_str_mv Cavalcante, Mariany Sousa
Marins, Rozane Valente
Dias, Francisco José da Silva
Rezende, Carlos Eduardo de
dc.subject.por.fl_str_mv Dissolved inorganic carbon
Mangroove
Particulate organic carbon
Carbono inorgânico- dissolução
Mangue
Carbono Orgânico-dissolução
topic Dissolved inorganic carbon
Mangroove
Particulate organic carbon
Carbono inorgânico- dissolução
Mangue
Carbono Orgânico-dissolução
description This study assesses the seasonal and hydrological factors controlling carbon fluxes and quality of organic matter through the maximum turbidity zone (MTZ) of a tropical semiarid estuary under extreme drought, the Jaguaribe River estuary located in northeast Brazil. Dissolved organic carbon (DOC) and particulate organic carbon (POC) concentrations decreased in the Jaguaribe River estuary during the past ten years, reflecting drought intensification and river damming. DOC and POC behavior were strongly correlated to the freshwater residence time and freshwater fraction. Correlations with Chl-a indicated that the biological activity did not regulate DOC but did POC. Stable isotope ratios (δ13C and δ15N) of POC showed that it was predominantly terrestrial-derived, suggesting mangrove as an important POC source. Dissolved inorganic carbon concentrations reflected the seasonal variability of the semiarid climate, being higher in the dry season due to the negative water balance during this period. The Jaguaribe River estuary’s MTZ behaved as a retainer of POC (-1.5 ± 0.2 × 104 tons.year−1), DOC (-1.0 × 105 tons.year−1) and DIC (-4.8 ± 3.3 × 105 tons.year−1) during the dry season and as an exporter of DOC (+ 2 x 104 tons.year−1) and DIC (+1.4 × 105 tons.year−1) in the rainy season. However, the reduced freshwater supply to the estuary resulted in carbon concentrations 50% lower than those reported in 2004 and carbon fluxes smaller than expected for a tropical region. This study indicates that, under a scenario of climatic changes, the intensification of droughts in NE Brazil can further increase carbon retention in the estuary, reducing its exportation to the ocean
publishDate 2022
dc.date.none.fl_str_mv 2022-01-17T13:54:00Z
2022-01-17T13:54:00Z
2022
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 CAVALCANTE, Mariany Sousa; MARIS, Rozane Valente; DIAS, Francisco José da Silva; REZENDE, Carlos Eduardo de. Assessment of carbon fluxes to coastal area during persistent drought conditions. Regional Studies in Marine Science, v. 47, 2021.
2352-4855
http://www.repositorio.ufc.br/handle/riufc/63525
identifier_str_mv CAVALCANTE, Mariany Sousa; MARIS, Rozane Valente; DIAS, Francisco José da Silva; REZENDE, Carlos Eduardo de. Assessment of carbon fluxes to coastal area during persistent drought conditions. Regional Studies in Marine Science, v. 47, 2021.
2352-4855
url http://www.repositorio.ufc.br/handle/riufc/63525
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 Regional Studies in Marine Science
publisher.none.fl_str_mv Regional Studies in Marine Science
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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