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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Main Authors: | , , , , , |
Other Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2018
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Subjects: | |
Online Access: | https://hal.science/hal-02619261 https://hal.science/hal-02619261/document https://hal.science/hal-02619261/file/Dulaquais_etal_JGR-O_2018.pdf https://doi.org/10.1029/2018JC014211 |
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ftunivbrest:oai:HAL:hal-02619261v1 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Université de Bretagne Occidentale: HAL |
op_collection_id |
ftunivbrest |
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 [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
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 [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Dulaquais, Gabriel Waeles, Matthieu Gerringa, Loes J. A. Middag, Rob Rijkenberg, Micha J. A. Riso, Ricardo, D. 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 [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
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 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)-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, D. |
author_facet |
Dulaquais, Gabriel Waeles, Matthieu Gerringa, Loes J. A. Middag, Rob Rijkenberg, Micha J. A. Riso, Ricardo, D. |
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://hal.science/hal-02619261 https://hal.science/hal-02619261/document https://hal.science/hal-02619261/file/Dulaquais_etal_JGR-O_2018.pdf https://doi.org/10.1029/2018JC014211 |
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 |
ISSN: 2169-9275 EISSN: 2169-9291 Journal of Geophysical Research. Oceans https://hal.science/hal-02619261 Journal of Geophysical Research. Oceans, 2018, 123 (8), pp.5481-5499. ⟨10.1029/2018JC014211⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2018JC014211 hal-02619261 https://hal.science/hal-02619261 https://hal.science/hal-02619261/document https://hal.science/hal-02619261/file/Dulaquais_etal_JGR-O_2018.pdf doi:10.1029/2018JC014211 |
op_rights |
info:eu-repo/semantics/OpenAccess |
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_ |
1790604876290457600 |
spelling |
ftunivbrest:oai:HAL:hal-02619261v1 2024-02-11T10:06:52+01:00 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, D. 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 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)-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 https://hal.science/hal-02619261 https://hal.science/hal-02619261/document https://hal.science/hal-02619261/file/Dulaquais_etal_JGR-O_2018.pdf https://doi.org/10.1029/2018JC014211 en eng HAL CCSD Wiley-Blackwell info:eu-repo/semantics/altIdentifier/doi/10.1029/2018JC014211 hal-02619261 https://hal.science/hal-02619261 https://hal.science/hal-02619261/document https://hal.science/hal-02619261/file/Dulaquais_etal_JGR-O_2018.pdf doi:10.1029/2018JC014211 info:eu-repo/semantics/OpenAccess ISSN: 2169-9275 EISSN: 2169-9291 Journal of Geophysical Research. Oceans https://hal.science/hal-02619261 Journal of Geophysical Research. Oceans, 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 [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2018 ftunivbrest https://doi.org/10.1029/2018JC014211 2024-01-23T23:39:59Z 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 Université de Bretagne Occidentale: HAL Suwannee River ENVELOPE(-100.046,-100.046,56.125,56.125) Journal of Geophysical Research: Oceans 123 8 5481 5499 |