Distribution of dissolved organic matter in estuaries of the southern Iberian Atlantic Basin: Sources, behavior and export to the coastal zone

Special issue Contemporary monitoring and assessment approaches to estuarine and coastal biogeochemistry.-- 15 pages, 8 figures, 4 tables, supplementary data https://doi.org/10.1016/j.marchem.2020.103857 The Gulf of Cádiz, located in the Southern Iberian Atlantic Basin, connects the North Atlantic O...

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Published in:Marine Chemistry
Main Authors: Amaral, Valentina, Romera-Castillo, Cristina, García-Delgado, M., Gómez-Parra, R., Forja, Jesús M.
Other Authors: Agencia Nacional de Investigación e Innovación (Uruguay), Ministerio de Economía y Competitividad (España), Ministerio de Ciencia, Innovación y Universidades (España)
Format: Article in Journal/Newspaper
Language:English
Published: Elsevier 2020
Subjects:
Online Access:http://hdl.handle.net/10261/222505
https://doi.org/10.1016/j.marchem.2020.103857
id ftcsic:oai:digital.csic.es:10261/222505
record_format openpolar
institution Open Polar
collection Digital.CSIC (Spanish National Research Council)
op_collection_id ftcsic
language English
topic Dissolved organic matter
EEMs-PARAFAC
Pyrolisis-GC-MS
Carbon flux and tides
spellingShingle Dissolved organic matter
EEMs-PARAFAC
Pyrolisis-GC-MS
Carbon flux and tides
Amaral, Valentina
Romera-Castillo, Cristina
García-Delgado, M.
Gómez-Parra, R.
Forja, Jesús M.
Distribution of dissolved organic matter in estuaries of the southern Iberian Atlantic Basin: Sources, behavior and export to the coastal zone
topic_facet Dissolved organic matter
EEMs-PARAFAC
Pyrolisis-GC-MS
Carbon flux and tides
description Special issue Contemporary monitoring and assessment approaches to estuarine and coastal biogeochemistry.-- 15 pages, 8 figures, 4 tables, supplementary data https://doi.org/10.1016/j.marchem.2020.103857 The Gulf of Cádiz, located in the Southern Iberian Atlantic Basin, connects the North Atlantic Ocean and the Mediterranean Sea and receives freshwater input from three main estuaries: Guadalquivir, Guadiana, and Tinto-Odiel. These estuaries differ in their hydrology, basin characteristic, and land use. One of them, Tinto-Odiel, is one of the most polluted estuaries in the world. However, little is known about the export of DOM from these estuaries to the Gulf of Cádiz. In this work, the estuaries were sampled during the dry season. Dissolved organic matter (DOM) was chemically characterized along a longitudinal gradient to better understand the reactivity and fate of carbon exported to the Gulf of Cádiz. We also performed a tidal study at the mouth of each estuary to understand how the tide affects the composition of DOM and its export to the coastal zone. Fluorescent DOM (FDOM) modeling employing multivariate parallel factor analysis and pyrolysis-gas chromatography-mass spectroscopy analysis (Py-GC–MS) were used to characterize DOM. DOM from Guadalquivir and Guadiana estuaries presented a predominant allochthonous origin with humic-like compounds making up to ~80% of the total fluorescent DOM. These estuaries receive lateral inputs from surrounding watersheds and agricultural practices. Instead, in Tinto-Odiel estuary, DOM was predominantly autochthonous with a higher content of protein-like material associated with the prevalence of the marine influence over the low water discharges and anthropogenic pollution from industrial activities. Tidal cycles affected the distribution of DOM and its quality with higher humic-like material during low tide and protein-like substances predominating during high tide. During the dry season, the three estuaries represented a source of DOM to the Gulf of Cádiz. Guadalquivir was the main contributor with 1.25 Kg C s−1 and 0.22 × 103 m2 s−1, for DOC and CDOM, respectively. Around 70% of the FDOM exported from the three estuaries was of humic nature. The results obtained in this work highlight the importance of local conditions, such as the basin characteristic and estuarine biogeochemical reactivity in the composition of the DOM exported to the coastal ocean. Moreover, Py-GC–MS analysis was a useful technique, complementary to fluorescence spectroscopy, which improves DOM characterization in estuarine systems Valentina Amaral was financed by the National Research and Innovation Agency of Uruguay (ANII) with a Ph.D. fellowship (POS_EXT_2015_1_122780). Cristina Romera-Castillo was funded by a Juan de la Cierva-Incorporación Postdoctoral Fellowship from the Spanish “Ministerio de Economía y Competitividad”. [.] This study was financed by the Spanish CICYT (Spanish Program for Science and Technology) under contracts CTM2014-59244-C3-1-R and RTI2018-100865-B-C21 Peer reviewed
author2 Agencia Nacional de Investigación e Innovación (Uruguay)
Ministerio de Economía y Competitividad (España)
Ministerio de Ciencia, Innovación y Universidades (España)
format Article in Journal/Newspaper
author Amaral, Valentina
Romera-Castillo, Cristina
García-Delgado, M.
Gómez-Parra, R.
Forja, Jesús M.
author_facet Amaral, Valentina
Romera-Castillo, Cristina
García-Delgado, M.
Gómez-Parra, R.
Forja, Jesús M.
author_sort Amaral, Valentina
title Distribution of dissolved organic matter in estuaries of the southern Iberian Atlantic Basin: Sources, behavior and export to the coastal zone
title_short Distribution of dissolved organic matter in estuaries of the southern Iberian Atlantic Basin: Sources, behavior and export to the coastal zone
title_full Distribution of dissolved organic matter in estuaries of the southern Iberian Atlantic Basin: Sources, behavior and export to the coastal zone
title_fullStr Distribution of dissolved organic matter in estuaries of the southern Iberian Atlantic Basin: Sources, behavior and export to the coastal zone
title_full_unstemmed Distribution of dissolved organic matter in estuaries of the southern Iberian Atlantic Basin: Sources, behavior and export to the coastal zone
title_sort distribution of dissolved organic matter in estuaries of the southern iberian atlantic basin: sources, behavior and export to the coastal zone
publisher Elsevier
publishDate 2020
url http://hdl.handle.net/10261/222505
https://doi.org/10.1016/j.marchem.2020.103857
long_lat ENVELOPE(-60.873,-60.873,-64.156,-64.156)
ENVELOPE(161.866,161.866,55.065,55.065)
geographic Cierva
Uruguay
Valentina
geographic_facet Cierva
Uruguay
Valentina
genre North Atlantic
genre_facet North Atlantic
op_relation MINECO/ICTI2013-2016/CTM2014-59244-C3-1-R
MICIU/ICTI2017-2020/RTI2018-100865-B-C21
Preprint
https://doi.org/10.1016/j.marchem.2020.103857

Marine Chemistry 226: 103857 (2020)
0304-4203
http://hdl.handle.net/10261/222505
doi:10.1016/j.marchem.2020.103857
op_rights openAccess
https://www.elsevier.com/about/policies/sharing
op_doi https://doi.org/10.1016/j.marchem.2020.103857
container_title Marine Chemistry
container_volume 226
container_start_page 103857
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spelling ftcsic:oai:digital.csic.es:10261/222505 2023-05-15T17:37:19+02:00 Distribution of dissolved organic matter in estuaries of the southern Iberian Atlantic Basin: Sources, behavior and export to the coastal zone Amaral, Valentina Romera-Castillo, Cristina García-Delgado, M. Gómez-Parra, R. Forja, Jesús M. Agencia Nacional de Investigación e Innovación (Uruguay) Ministerio de Economía y Competitividad (España) Ministerio de Ciencia, Innovación y Universidades (España) 2020-10 http://hdl.handle.net/10261/222505 https://doi.org/10.1016/j.marchem.2020.103857 eng eng Elsevier MINECO/ICTI2013-2016/CTM2014-59244-C3-1-R MICIU/ICTI2017-2020/RTI2018-100865-B-C21 Preprint https://doi.org/10.1016/j.marchem.2020.103857 Sí Marine Chemistry 226: 103857 (2020) 0304-4203 http://hdl.handle.net/10261/222505 doi:10.1016/j.marchem.2020.103857 openAccess https://www.elsevier.com/about/policies/sharing Dissolved organic matter EEMs-PARAFAC Pyrolisis-GC-MS Carbon flux and tides artículo 2020 ftcsic https://doi.org/10.1016/j.marchem.2020.103857 2020-11-11T00:29:22Z Special issue Contemporary monitoring and assessment approaches to estuarine and coastal biogeochemistry.-- 15 pages, 8 figures, 4 tables, supplementary data https://doi.org/10.1016/j.marchem.2020.103857 The Gulf of Cádiz, located in the Southern Iberian Atlantic Basin, connects the North Atlantic Ocean and the Mediterranean Sea and receives freshwater input from three main estuaries: Guadalquivir, Guadiana, and Tinto-Odiel. These estuaries differ in their hydrology, basin characteristic, and land use. One of them, Tinto-Odiel, is one of the most polluted estuaries in the world. However, little is known about the export of DOM from these estuaries to the Gulf of Cádiz. In this work, the estuaries were sampled during the dry season. Dissolved organic matter (DOM) was chemically characterized along a longitudinal gradient to better understand the reactivity and fate of carbon exported to the Gulf of Cádiz. We also performed a tidal study at the mouth of each estuary to understand how the tide affects the composition of DOM and its export to the coastal zone. Fluorescent DOM (FDOM) modeling employing multivariate parallel factor analysis and pyrolysis-gas chromatography-mass spectroscopy analysis (Py-GC–MS) were used to characterize DOM. DOM from Guadalquivir and Guadiana estuaries presented a predominant allochthonous origin with humic-like compounds making up to ~80% of the total fluorescent DOM. These estuaries receive lateral inputs from surrounding watersheds and agricultural practices. Instead, in Tinto-Odiel estuary, DOM was predominantly autochthonous with a higher content of protein-like material associated with the prevalence of the marine influence over the low water discharges and anthropogenic pollution from industrial activities. Tidal cycles affected the distribution of DOM and its quality with higher humic-like material during low tide and protein-like substances predominating during high tide. During the dry season, the three estuaries represented a source of DOM to the Gulf of Cádiz. Guadalquivir was the main contributor with 1.25 Kg C s−1 and 0.22 × 103 m2 s−1, for DOC and CDOM, respectively. Around 70% of the FDOM exported from the three estuaries was of humic nature. The results obtained in this work highlight the importance of local conditions, such as the basin characteristic and estuarine biogeochemical reactivity in the composition of the DOM exported to the coastal ocean. Moreover, Py-GC–MS analysis was a useful technique, complementary to fluorescence spectroscopy, which improves DOM characterization in estuarine systems Valentina Amaral was financed by the National Research and Innovation Agency of Uruguay (ANII) with a Ph.D. fellowship (POS_EXT_2015_1_122780). Cristina Romera-Castillo was funded by a Juan de la Cierva-Incorporación Postdoctoral Fellowship from the Spanish “Ministerio de Economía y Competitividad”. [.] This study was financed by the Spanish CICYT (Spanish Program for Science and Technology) under contracts CTM2014-59244-C3-1-R and RTI2018-100865-B-C21 Peer reviewed Article in Journal/Newspaper North Atlantic Digital.CSIC (Spanish National Research Council) Cierva ENVELOPE(-60.873,-60.873,-64.156,-64.156) Uruguay Valentina ENVELOPE(161.866,161.866,55.065,55.065) Marine Chemistry 226 103857