Characteristics of organic matter sources from Guadiana Estuary salt marsh sediments (SW Iberian Peninsula)
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10174/31551 https://doi.org/10.1016/j.csr.2020.104076 |
Resumo: | Estuaries are dynamic interfaces between land, rivers and the ocean that play major roles in the global carbon cycle. These coastal wetlands store huge amounts of organic carbon (OC), commonly known as “blue carbon” and excellent places to study C cycling. The Guadiana river estuary is among the most important tidal salt marshes in the South - Iberian coastal margin. Here, a detailed organic geochemical study is described that includes the identification of sedimentary OM composition at a molecular and isotopic level. Total organic carbon content (TOC) of core sediments ranged from 0.39 to 2.23% and stable carbon isotope composition (δ13C) also showed a wide range between −22.4 and −27.0‰. A13C depletion trend observed from the surface to bottom in the core sediments profiles, reflects loss of labile biogenic 13C enriched compounds i.e. polysaccharides and a selective preservation of more depleted compounds with depth i.e. lignin and lipids in the core sediments. Series of n-alkanes were found in the range from C10 to C31. Carbon preference index ratio (CPI) calculated for long-chain n-alkanes (C24–C31) that ranged between 1.17 and 1.94 reflecting diverse OM inputs to the sediments. A study of the lignin-derived phenolic composition pointed to a recalcitrant OM derived from both gymnosperm and angiosperm plants. Moreover, high abundance of vinyl phenol and vinyl guaiacol points to a dominant contribution of lignins from grasses and aquatic macrophytes to the sediments. A well-resolved series of long-chain linear alkyl benzenes (LABs from C4 to C22) were recorded in all core sediment samples indicating direct discharge of untreated domestic and/or industrial effluents to the estuary. Polycyclic aromatic hydrocarbons (PAHs) with more than 3 rings reflects the pyrogenic origin of a portion of the sedimentary OM. This study highlights the importance of different OM sources to the lower Guadiana estuarine sediments and contributes to a better knowledge about its origin, dynamics and fate. |
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Characteristics of organic matter sources from Guadiana Estuary salt marsh sediments (SW Iberian Peninsula)Analytical pyrolysisLABsLigninMolecular biomarkersPAHsSalt marshesStable isotopesEstuaries are dynamic interfaces between land, rivers and the ocean that play major roles in the global carbon cycle. These coastal wetlands store huge amounts of organic carbon (OC), commonly known as “blue carbon” and excellent places to study C cycling. The Guadiana river estuary is among the most important tidal salt marshes in the South - Iberian coastal margin. Here, a detailed organic geochemical study is described that includes the identification of sedimentary OM composition at a molecular and isotopic level. Total organic carbon content (TOC) of core sediments ranged from 0.39 to 2.23% and stable carbon isotope composition (δ13C) also showed a wide range between −22.4 and −27.0‰. A13C depletion trend observed from the surface to bottom in the core sediments profiles, reflects loss of labile biogenic 13C enriched compounds i.e. polysaccharides and a selective preservation of more depleted compounds with depth i.e. lignin and lipids in the core sediments. Series of n-alkanes were found in the range from C10 to C31. Carbon preference index ratio (CPI) calculated for long-chain n-alkanes (C24–C31) that ranged between 1.17 and 1.94 reflecting diverse OM inputs to the sediments. A study of the lignin-derived phenolic composition pointed to a recalcitrant OM derived from both gymnosperm and angiosperm plants. Moreover, high abundance of vinyl phenol and vinyl guaiacol points to a dominant contribution of lignins from grasses and aquatic macrophytes to the sediments. A well-resolved series of long-chain linear alkyl benzenes (LABs from C4 to C22) were recorded in all core sediment samples indicating direct discharge of untreated domestic and/or industrial effluents to the estuary. Polycyclic aromatic hydrocarbons (PAHs) with more than 3 rings reflects the pyrogenic origin of a portion of the sedimentary OM. This study highlights the importance of different OM sources to the lower Guadiana estuarine sediments and contributes to a better knowledge about its origin, dynamics and fate.Elseviers2022-03-30T13:58:51Z2022-03-302020-06-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://hdl.handle.net/10174/31551http://hdl.handle.net/10174/31551https://doi.org/10.1016/j.csr.2020.104076porKumar M, Boski T, González-Vila FJ, Jiménez-Morillo NT, González-Pérez JA (2020). Characteristics of organic matter sources from Guadiana Estuary salt marsh sediments (SW Iberian Peninsula). Cont. Shelf Res. 197, 104076.Continental Shelf Researchndndndntjm@uevora.ptnd396Kumar, MukeshBoski, TomaszGonzález-Vila, Francisco J.Jiménez-Morillo, Nicasio T.González-Pérez, José A.info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-01-03T19:31:19Zoai:dspace.uevora.pt:10174/31551Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T01:20:41.679718Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Characteristics of organic matter sources from Guadiana Estuary salt marsh sediments (SW Iberian Peninsula) |
title |
Characteristics of organic matter sources from Guadiana Estuary salt marsh sediments (SW Iberian Peninsula) |
spellingShingle |
Characteristics of organic matter sources from Guadiana Estuary salt marsh sediments (SW Iberian Peninsula) Kumar, Mukesh Analytical pyrolysis LABs Lignin Molecular biomarkers PAHs Salt marshes Stable isotopes |
title_short |
Characteristics of organic matter sources from Guadiana Estuary salt marsh sediments (SW Iberian Peninsula) |
title_full |
Characteristics of organic matter sources from Guadiana Estuary salt marsh sediments (SW Iberian Peninsula) |
title_fullStr |
Characteristics of organic matter sources from Guadiana Estuary salt marsh sediments (SW Iberian Peninsula) |
title_full_unstemmed |
Characteristics of organic matter sources from Guadiana Estuary salt marsh sediments (SW Iberian Peninsula) |
title_sort |
Characteristics of organic matter sources from Guadiana Estuary salt marsh sediments (SW Iberian Peninsula) |
author |
Kumar, Mukesh |
author_facet |
Kumar, Mukesh Boski, Tomasz González-Vila, Francisco J. Jiménez-Morillo, Nicasio T. González-Pérez, José A. |
author_role |
author |
author2 |
Boski, Tomasz González-Vila, Francisco J. Jiménez-Morillo, Nicasio T. González-Pérez, José A. |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Kumar, Mukesh Boski, Tomasz González-Vila, Francisco J. Jiménez-Morillo, Nicasio T. González-Pérez, José A. |
dc.subject.por.fl_str_mv |
Analytical pyrolysis LABs Lignin Molecular biomarkers PAHs Salt marshes Stable isotopes |
topic |
Analytical pyrolysis LABs Lignin Molecular biomarkers PAHs Salt marshes Stable isotopes |
description |
Estuaries are dynamic interfaces between land, rivers and the ocean that play major roles in the global carbon cycle. These coastal wetlands store huge amounts of organic carbon (OC), commonly known as “blue carbon” and excellent places to study C cycling. The Guadiana river estuary is among the most important tidal salt marshes in the South - Iberian coastal margin. Here, a detailed organic geochemical study is described that includes the identification of sedimentary OM composition at a molecular and isotopic level. Total organic carbon content (TOC) of core sediments ranged from 0.39 to 2.23% and stable carbon isotope composition (δ13C) also showed a wide range between −22.4 and −27.0‰. A13C depletion trend observed from the surface to bottom in the core sediments profiles, reflects loss of labile biogenic 13C enriched compounds i.e. polysaccharides and a selective preservation of more depleted compounds with depth i.e. lignin and lipids in the core sediments. Series of n-alkanes were found in the range from C10 to C31. Carbon preference index ratio (CPI) calculated for long-chain n-alkanes (C24–C31) that ranged between 1.17 and 1.94 reflecting diverse OM inputs to the sediments. A study of the lignin-derived phenolic composition pointed to a recalcitrant OM derived from both gymnosperm and angiosperm plants. Moreover, high abundance of vinyl phenol and vinyl guaiacol points to a dominant contribution of lignins from grasses and aquatic macrophytes to the sediments. A well-resolved series of long-chain linear alkyl benzenes (LABs from C4 to C22) were recorded in all core sediment samples indicating direct discharge of untreated domestic and/or industrial effluents to the estuary. Polycyclic aromatic hydrocarbons (PAHs) with more than 3 rings reflects the pyrogenic origin of a portion of the sedimentary OM. This study highlights the importance of different OM sources to the lower Guadiana estuarine sediments and contributes to a better knowledge about its origin, dynamics and fate. |
publishDate |
2020 |
dc.date.none.fl_str_mv |
2020-06-01T00:00:00Z 2022-03-30T13:58:51Z 2022-03-30 |
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 |
http://hdl.handle.net/10174/31551 http://hdl.handle.net/10174/31551 https://doi.org/10.1016/j.csr.2020.104076 |
url |
http://hdl.handle.net/10174/31551 https://doi.org/10.1016/j.csr.2020.104076 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
Kumar M, Boski T, González-Vila FJ, Jiménez-Morillo NT, González-Pérez JA (2020). Characteristics of organic matter sources from Guadiana Estuary salt marsh sediments (SW Iberian Peninsula). Cont. Shelf Res. 197, 104076. Continental Shelf Research nd nd nd ntjm@uevora.pt nd 396 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.publisher.none.fl_str_mv |
Elseviers |
publisher.none.fl_str_mv |
Elseviers |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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