The Biogeochemistry of Electroactive Humic Substances and Its Connection to Iron Chemistry in the North East Atlantic and the Western Mediterranean Sea
WOS:000445188900025 International audience We present the zonal distribution of electroactive humic-like substances (eHS) along a section from Offshore Portugal in the North East Atlantic to the Sicily Channel in the Mediterranean Sea. The concentrations were normalized to Suwannee River Fulvic Acid...
Published in: | Journal of Geophysical Research: Oceans |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Online Access: | https://doi.org/10.1029/2018JC014211 https://hal.archives-ouvertes.fr/hal-02619261/file/Dulaquais_etal_JGR-O_2018.pdf https://hal.archives-ouvertes.fr/hal-02619261 |
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fttriple:oai:gotriple.eu:10670/1.faiq7a 2023-05-15T17:38:21+02:00 The Biogeochemistry of Electroactive Humic Substances and Its Connection to Iron Chemistry in the North East Atlantic and the Western Mediterranean Sea Dulaquais, Gabriel Waeles, Matthieu Gerringa, Loes J. A. Middag, Rob Rijkenberg, Micha J. A. Riso, Ricardo Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Royal Netherlands Institute for Sea Research (NIOZ) ANR-10-LABX-0019,LabexMER,LabexMER Marine Excellence Research: a changing ocean(2010) 2018-01-01 https://doi.org/10.1029/2018JC014211 https://hal.archives-ouvertes.fr/hal-02619261/file/Dulaquais_etal_JGR-O_2018.pdf https://hal.archives-ouvertes.fr/hal-02619261 en eng HAL CCSD Wiley-Blackwell hal-02619261 doi:10.1029/2018JC014211 10670/1.faiq7a https://hal.archives-ouvertes.fr/hal-02619261/file/Dulaquais_etal_JGR-O_2018.pdf https://hal.archives-ouvertes.fr/hal-02619261 other Hyper Article en Ligne - Sciences de l'Homme et de la Société ISSN: 2169-9275 EISSN: 2169-9291 Journal of Geophysical Research. Oceans Journal of Geophysical Research. Oceans, Wiley-Blackwell, 2018, 123 (8), pp.5481-5499. ⟨10.1029/2018JC014211⟩ ACL Mediterranean Sea optical-properties natural-waters iron biogeochemistry humic substances cathodic stripping voltammetry complexing ligands dissolved organic-matter excitation-emission matrix fluorescence characteristics fresh-waters geotraces southeastern united-states trace-metals envir geo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2018 fttriple https://doi.org/10.1029/2018JC014211 2023-01-22T18:39:55Z WOS:000445188900025 International audience We present the zonal distribution of electroactive humic-like substances (eHS) along a section from Offshore Portugal in the North East Atlantic to the Sicily Channel in the Mediterranean Sea. The concentrations were normalized to Suwannee River Fulvic Acid and ranged from 11g/L to 81g/L. The vertical distributions were typical of those previously reported for dissolved organic carbon in the Mediterranean Sea. High eHS concentrations were measured in surface water and concentrations decreased with depth before increasing again toward benthic maxima measured at some stations. We estimate that eHS represented a relatively small fraction of the natural organic matter in the Mediterranean Sea (2-5%) but considering their important role in the complexation and the solubility of key trace elements (e.g., iron and copper), the eHS cycle could influence the entire biogeochemistry of these marine systems. We identified key processes controlling the concentration of eHS. While biologically mediated production was the major source of eHS, riverine and rain inputs as well as sediment release were also likely external sources. Low eHS concentrations at subsurface depths pointed to photodegradation as a possible sink of eHS, but degradation by heterotrophic bacteria seemed to be the main sink in the deep sea. Finally, we found a positive correlation between dissolved iron and eHS concentrations. Estimation of eHS contribution to iron binding ligand concentrations indicates the complexation of iron by eHS in the Mediterranean Sea. These observations suggest links between the cycles of eHS and iron in the Mediterranean Sea. Article in Journal/Newspaper North East Atlantic Unknown Suwannee River ENVELOPE(-100.046,-100.046,56.125,56.125) Journal of Geophysical Research: Oceans 123 8 5481 5499 |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
English |
topic |
ACL Mediterranean Sea optical-properties natural-waters iron biogeochemistry humic substances cathodic stripping voltammetry complexing ligands dissolved organic-matter excitation-emission matrix fluorescence characteristics fresh-waters geotraces southeastern united-states trace-metals envir geo |
spellingShingle |
ACL Mediterranean Sea optical-properties natural-waters iron biogeochemistry humic substances cathodic stripping voltammetry complexing ligands dissolved organic-matter excitation-emission matrix fluorescence characteristics fresh-waters geotraces southeastern united-states trace-metals envir geo Dulaquais, Gabriel Waeles, Matthieu Gerringa, Loes J. A. Middag, Rob Rijkenberg, Micha J. A. Riso, Ricardo The Biogeochemistry of Electroactive Humic Substances and Its Connection to Iron Chemistry in the North East Atlantic and the Western Mediterranean Sea |
topic_facet |
ACL Mediterranean Sea optical-properties natural-waters iron biogeochemistry humic substances cathodic stripping voltammetry complexing ligands dissolved organic-matter excitation-emission matrix fluorescence characteristics fresh-waters geotraces southeastern united-states trace-metals envir geo |
description |
WOS:000445188900025 International audience We present the zonal distribution of electroactive humic-like substances (eHS) along a section from Offshore Portugal in the North East Atlantic to the Sicily Channel in the Mediterranean Sea. The concentrations were normalized to Suwannee River Fulvic Acid and ranged from 11g/L to 81g/L. The vertical distributions were typical of those previously reported for dissolved organic carbon in the Mediterranean Sea. High eHS concentrations were measured in surface water and concentrations decreased with depth before increasing again toward benthic maxima measured at some stations. We estimate that eHS represented a relatively small fraction of the natural organic matter in the Mediterranean Sea (2-5%) but considering their important role in the complexation and the solubility of key trace elements (e.g., iron and copper), the eHS cycle could influence the entire biogeochemistry of these marine systems. We identified key processes controlling the concentration of eHS. While biologically mediated production was the major source of eHS, riverine and rain inputs as well as sediment release were also likely external sources. Low eHS concentrations at subsurface depths pointed to photodegradation as a possible sink of eHS, but degradation by heterotrophic bacteria seemed to be the main sink in the deep sea. Finally, we found a positive correlation between dissolved iron and eHS concentrations. Estimation of eHS contribution to iron binding ligand concentrations indicates the complexation of iron by eHS in the Mediterranean Sea. These observations suggest links between the cycles of eHS and iron in the Mediterranean Sea. |
author2 |
Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Royal Netherlands Institute for Sea Research (NIOZ) ANR-10-LABX-0019,LabexMER,LabexMER Marine Excellence Research: a changing ocean(2010) |
format |
Article in Journal/Newspaper |
author |
Dulaquais, Gabriel Waeles, Matthieu Gerringa, Loes J. A. Middag, Rob Rijkenberg, Micha J. A. Riso, Ricardo |
author_facet |
Dulaquais, Gabriel Waeles, Matthieu Gerringa, Loes J. A. Middag, Rob Rijkenberg, Micha J. A. Riso, Ricardo |
author_sort |
Dulaquais, Gabriel |
title |
The Biogeochemistry of Electroactive Humic Substances and Its Connection to Iron Chemistry in the North East Atlantic and the Western Mediterranean Sea |
title_short |
The Biogeochemistry of Electroactive Humic Substances and Its Connection to Iron Chemistry in the North East Atlantic and the Western Mediterranean Sea |
title_full |
The Biogeochemistry of Electroactive Humic Substances and Its Connection to Iron Chemistry in the North East Atlantic and the Western Mediterranean Sea |
title_fullStr |
The Biogeochemistry of Electroactive Humic Substances and Its Connection to Iron Chemistry in the North East Atlantic and the Western Mediterranean Sea |
title_full_unstemmed |
The Biogeochemistry of Electroactive Humic Substances and Its Connection to Iron Chemistry in the North East Atlantic and the Western Mediterranean Sea |
title_sort |
biogeochemistry of electroactive humic substances and its connection to iron chemistry in the north east atlantic and the western mediterranean sea |
publisher |
HAL CCSD |
publishDate |
2018 |
url |
https://doi.org/10.1029/2018JC014211 https://hal.archives-ouvertes.fr/hal-02619261/file/Dulaquais_etal_JGR-O_2018.pdf https://hal.archives-ouvertes.fr/hal-02619261 |
long_lat |
ENVELOPE(-100.046,-100.046,56.125,56.125) |
geographic |
Suwannee River |
geographic_facet |
Suwannee River |
genre |
North East Atlantic |
genre_facet |
North East Atlantic |
op_source |
Hyper Article en Ligne - Sciences de l'Homme et de la Société ISSN: 2169-9275 EISSN: 2169-9291 Journal of Geophysical Research. Oceans Journal of Geophysical Research. Oceans, Wiley-Blackwell, 2018, 123 (8), pp.5481-5499. ⟨10.1029/2018JC014211⟩ |
op_relation |
hal-02619261 doi:10.1029/2018JC014211 10670/1.faiq7a https://hal.archives-ouvertes.fr/hal-02619261/file/Dulaquais_etal_JGR-O_2018.pdf https://hal.archives-ouvertes.fr/hal-02619261 |
op_rights |
other |
op_doi |
https://doi.org/10.1029/2018JC014211 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
123 |
container_issue |
8 |
container_start_page |
5481 |
op_container_end_page |
5499 |
_version_ |
1766138763456544768 |