The Biogeochemistry of Electroactive Humic Substances and Its Connection to Iron Chemistry in the North East Atlantic and the Western Mediterranean Sea
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 vertic...
Published in: | Journal of Geophysical Research: Oceans |
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fttriple:oai:gotriple.eu:10670/1.b37g90 2023-05-15T17:38:20+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, Mathieu Gerringa, Loes J. A. Middag, Rob Rijkenberg, Micha J. A. Riso, Ricardo https://doi.org/10.1029/2018JC014211 https://archimer.ifremer.fr/doc/00616/72781/72218.pdf https://archimer.ifremer.fr/doc/00616/72781/72219.pdf https://archimer.ifremer.fr/doc/00616/72781/ en eng Amer Geophysical Union doi:10.1029/2018JC014211 10670/1.b37g90 https://archimer.ifremer.fr/doc/00616/72781/72218.pdf https://archimer.ifremer.fr/doc/00616/72781/72219.pdf https://archimer.ifremer.fr/doc/00616/72781/ other Archimer, archive institutionnelle de l'Ifremer Journal Of Geophysical Research-oceans (2169-9275) (Amer Geophysical Union), 2018-08 , Vol. 123 , N. 8 , P. 5481-5499 envir geo Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ fttriple https://doi.org/10.1029/2018JC014211 2023-01-22T17:08:24Z 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. Text North East Atlantic Unknown Suwannee River ENVELOPE(-100.046,-100.046,56.125,56.125) Journal of Geophysical Research: Oceans 123 8 5481 5499 |
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envir geo Dulaquais, Gabriel Waeles, Mathieu 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 |
envir geo |
description |
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. |
format |
Text |
author |
Dulaquais, Gabriel Waeles, Mathieu Gerringa, Loes J. A. Middag, Rob Rijkenberg, Micha J. A. Riso, Ricardo |
author_facet |
Dulaquais, Gabriel Waeles, Mathieu 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 |
Amer Geophysical Union |
url |
https://doi.org/10.1029/2018JC014211 https://archimer.ifremer.fr/doc/00616/72781/72218.pdf https://archimer.ifremer.fr/doc/00616/72781/72219.pdf https://archimer.ifremer.fr/doc/00616/72781/ |
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 |
Archimer, archive institutionnelle de l'Ifremer Journal Of Geophysical Research-oceans (2169-9275) (Amer Geophysical Union), 2018-08 , Vol. 123 , N. 8 , P. 5481-5499 |
op_relation |
doi:10.1029/2018JC014211 10670/1.b37g90 https://archimer.ifremer.fr/doc/00616/72781/72218.pdf https://archimer.ifremer.fr/doc/00616/72781/72219.pdf https://archimer.ifremer.fr/doc/00616/72781/ |
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_ |
1766138743682498560 |