Organic complexation of iron in the West Atlantic Ocean
The characteristics of the dissolved iron (DFe) binding organic ligands were determined during 3 Dutch GEOTRACES cruises covering the length of the West Atlantic Ocean. Adsorptive Differential Pulse Cathodic Stripping Voltammetry (AdDPCSV) with TAC as competing ligand was used to measure Fe binding...
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ftunivbruxelles:oai:dipot.ulb.ac.be:2013/226601 2023-05-15T15:03:43+02:00 Organic complexation of iron in the West Atlantic Ocean Gerringa, Loes J.A. Rijkenberg, Micha J A Schoemann, Véronique Laan, Patrick De Baar, Hein J W 2015-12 1 full-text file(s): application/pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/226601 https://dipot.ulb.ac.be/dspace/bitstream/2013/226601/1/Elsevier_210228.pdf en eng uri/info:doi/10.1016/j.marchem.2015.04.007 uri/info:pii/S0304420315001012 uri/info:scp/84947494096 https://dipot.ulb.ac.be/dspace/bitstream/2013/226601/1/Elsevier_210228.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/226601 1 full-text file(s): info:eu-repo/semantics/restrictedAccess Marine chemistry, 177 Océanographie physique et chimique Chimie Technologie de l'environnement contrôle de la pollution Traitement des eaux résiduaires Traitement de potabilisation de l'eau Atlantic ocean Dissolved iron GEOTRACES Organic iron complexation Organic ligands Seawater info:eu-repo/semantics/article info:ulb-repo/semantics/articlePeerReview info:ulb-repo/semantics/openurl/article 2015 ftunivbruxelles 2022-06-12T21:39:27Z The characteristics of the dissolved iron (DFe) binding organic ligands were determined during 3 Dutch GEOTRACES cruises covering the length of the West Atlantic Ocean. Adsorptive Differential Pulse Cathodic Stripping Voltammetry (AdDPCSV) with TAC as competing ligand was used to measure Fe binding organic ligands. Although the distribution of DFe is related to its sources, sinks and vertical processes, ultimately it is the solubility of Fe in seawater that determines its concentrations in the oceans. The Fe binding organic ligands increase the solubility of Fe. The total ligand concentration and the excess ligand over Fe concentration showed a decreasing trend from north to south in the surface ocean as well as in the North Atlantic Deep Water (NADW). This trend could be extended further north to the Arctic Ocean, where ligand concentrations were even higher. The Arctic might be a source of ligands to the northern West Atlantic Ocean. We calculated a residence time of 779 to 1039. years for dissolved organic ligands in the NADW. This is 2.5 to 4 times larger than the estimated residence time of DFe in the NADW.The highest concentrations of excess ligands were found in the surface where the dissolved Fe concentrations were the lowest. This resulted in high ratios of [Lt]/DFe in the surface decreasing with depth to a value close to 2 below 500. m, where more ligands were saturated. Dissolved organic ligands were saturated with Fe in a large part of the southern West Atlantic at mid-depth, where DFe concentrations increased due to hydrothermal activity.The inorganic Fe concentrations, [Fe'], were surprisingly uniform for the western Atlantic Ocean. Values ranged between 0.2 and 1. pM in the deep Atlantic as well as in the surface, where ligands were unsaturated with Fe. However, in the hydrothermal influenced region, where ligands were (nearly) saturated, [Fe'] was high, possibly larger than the solubility product of the Fe(oxy)hydroxides and thus suggesting either high concentrations of colloidal Fe or ... Article in Journal/Newspaper Arctic Arctic Ocean NADW North Atlantic Deep Water North Atlantic DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) Arctic Arctic Ocean Tac ENVELOPE(-59.517,-59.517,-62.500,-62.500) |
institution |
Open Polar |
collection |
DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) |
op_collection_id |
ftunivbruxelles |
language |
English |
topic |
Océanographie physique et chimique Chimie Technologie de l'environnement contrôle de la pollution Traitement des eaux résiduaires Traitement de potabilisation de l'eau Atlantic ocean Dissolved iron GEOTRACES Organic iron complexation Organic ligands Seawater |
spellingShingle |
Océanographie physique et chimique Chimie Technologie de l'environnement contrôle de la pollution Traitement des eaux résiduaires Traitement de potabilisation de l'eau Atlantic ocean Dissolved iron GEOTRACES Organic iron complexation Organic ligands Seawater Gerringa, Loes J.A. Rijkenberg, Micha J A Schoemann, Véronique Laan, Patrick De Baar, Hein J W Organic complexation of iron in the West Atlantic Ocean |
topic_facet |
Océanographie physique et chimique Chimie Technologie de l'environnement contrôle de la pollution Traitement des eaux résiduaires Traitement de potabilisation de l'eau Atlantic ocean Dissolved iron GEOTRACES Organic iron complexation Organic ligands Seawater |
description |
The characteristics of the dissolved iron (DFe) binding organic ligands were determined during 3 Dutch GEOTRACES cruises covering the length of the West Atlantic Ocean. Adsorptive Differential Pulse Cathodic Stripping Voltammetry (AdDPCSV) with TAC as competing ligand was used to measure Fe binding organic ligands. Although the distribution of DFe is related to its sources, sinks and vertical processes, ultimately it is the solubility of Fe in seawater that determines its concentrations in the oceans. The Fe binding organic ligands increase the solubility of Fe. The total ligand concentration and the excess ligand over Fe concentration showed a decreasing trend from north to south in the surface ocean as well as in the North Atlantic Deep Water (NADW). This trend could be extended further north to the Arctic Ocean, where ligand concentrations were even higher. The Arctic might be a source of ligands to the northern West Atlantic Ocean. We calculated a residence time of 779 to 1039. years for dissolved organic ligands in the NADW. This is 2.5 to 4 times larger than the estimated residence time of DFe in the NADW.The highest concentrations of excess ligands were found in the surface where the dissolved Fe concentrations were the lowest. This resulted in high ratios of [Lt]/DFe in the surface decreasing with depth to a value close to 2 below 500. m, where more ligands were saturated. Dissolved organic ligands were saturated with Fe in a large part of the southern West Atlantic at mid-depth, where DFe concentrations increased due to hydrothermal activity.The inorganic Fe concentrations, [Fe'], were surprisingly uniform for the western Atlantic Ocean. Values ranged between 0.2 and 1. pM in the deep Atlantic as well as in the surface, where ligands were unsaturated with Fe. However, in the hydrothermal influenced region, where ligands were (nearly) saturated, [Fe'] was high, possibly larger than the solubility product of the Fe(oxy)hydroxides and thus suggesting either high concentrations of colloidal Fe or ... |
format |
Article in Journal/Newspaper |
author |
Gerringa, Loes J.A. Rijkenberg, Micha J A Schoemann, Véronique Laan, Patrick De Baar, Hein J W |
author_facet |
Gerringa, Loes J.A. Rijkenberg, Micha J A Schoemann, Véronique Laan, Patrick De Baar, Hein J W |
author_sort |
Gerringa, Loes J.A. |
title |
Organic complexation of iron in the West Atlantic Ocean |
title_short |
Organic complexation of iron in the West Atlantic Ocean |
title_full |
Organic complexation of iron in the West Atlantic Ocean |
title_fullStr |
Organic complexation of iron in the West Atlantic Ocean |
title_full_unstemmed |
Organic complexation of iron in the West Atlantic Ocean |
title_sort |
organic complexation of iron in the west atlantic ocean |
publishDate |
2015 |
url |
http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/226601 https://dipot.ulb.ac.be/dspace/bitstream/2013/226601/1/Elsevier_210228.pdf |
long_lat |
ENVELOPE(-59.517,-59.517,-62.500,-62.500) |
geographic |
Arctic Arctic Ocean Tac |
geographic_facet |
Arctic Arctic Ocean Tac |
genre |
Arctic Arctic Ocean NADW North Atlantic Deep Water North Atlantic |
genre_facet |
Arctic Arctic Ocean NADW North Atlantic Deep Water North Atlantic |
op_source |
Marine chemistry, 177 |
op_relation |
uri/info:doi/10.1016/j.marchem.2015.04.007 uri/info:pii/S0304420315001012 uri/info:scp/84947494096 https://dipot.ulb.ac.be/dspace/bitstream/2013/226601/1/Elsevier_210228.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/226601 |
op_rights |
1 full-text file(s): info:eu-repo/semantics/restrictedAccess |
_version_ |
1766335576429035520 |