Chemical controls on iron distributions across the subsurface South Pacific Ocean

Iron and nitrogen are the primary nutrients that limit productivity in the ocean. While nitrogen cycling is largely controlled by biology, iron cycling is strongly determined by chemistry because iron losses are driven by abiotic formation of authigenic iron hydroxides (authFeOH). Here, we apply a m...

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Detalles Bibliográficos
Autores: Gledhill, M., Gosnell, K., Humphreys, M. P., Delaigue, L., Helle, N., Zhu, K., Lodeiro, Pablo, Rey-Castro, Carlos, Achterberg, E.P.
Tipo de recurso: artículo
Estado:Versión enviada para evaluación y publicación
Fecha de publicación:2025
País:España
Institución:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repositorio:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:10459.1/469237
Acceso en línea:https://doi.org/10.26434/chemrxiv-2025-2xl81
https://hdl.handle.net/10459.1/469237
Access Level:acceso abierto
Palabra clave:Iron
Ocean
Biogeochemistry
Trace metals
Chemical speciation
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spelling Chemical controls on iron distributions across the subsurface South Pacific OceanGledhill, M.Gosnell, K.Humphreys, M. P.Delaigue, L.Helle, N.Zhu, K.Lodeiro, PabloRey-Castro, CarlosAchterberg, E.P.IronOceanBiogeochemistryTrace metalsChemical speciationIron and nitrogen are the primary nutrients that limit productivity in the ocean. While nitrogen cycling is largely controlled by biology, iron cycling is strongly determined by chemistry because iron losses are driven by abiotic formation of authigenic iron hydroxides (authFeOH). Here, we apply a mechanistic approach to examine how organic matter across the dissolved-particulate size spectrum controls authFeOH formation in subsurface waters (>250 m) of the South Pacific Ocean. We find that accounting for the chemical heterogeneity of organic matter is essential for predicting widespread authFeOH formation. Predicted dissolved and particulate iron concentrations matched observations in the ocean interior, while discrepancies were linked to kinetic control of authFeOH formation or inputs of particles from the seafloor. Our results highlight the need to represent complexity in abiotic interactions to better resolve the interplay of chemical and biological controls on ocean iron cycling.Bundesministerium für Bildung und ForschungChemRxiv2025info:eu-repo/semantics/articleinfo:eu-repo/semantics/submittedVersionhttps://doi.org/10.26434/chemrxiv-2025-2xl81https://hdl.handle.net/10459.1/469237reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésVersió preprint del document publicat a: https://doi.org/10.26434/chemrxiv-2025-2xl81Earth, Space, and Environmental Chemistry, 2025, p.1-19cc-by-nc (c) Gledhill et al., 2025Attribution-NonCommercial 4.0 Internationalinfo:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc/4.0/oai:recercat.cat:10459.1/4692372026-05-29T05:05:01Z
dc.title.none.fl_str_mv Chemical controls on iron distributions across the subsurface South Pacific Ocean
title Chemical controls on iron distributions across the subsurface South Pacific Ocean
spellingShingle Chemical controls on iron distributions across the subsurface South Pacific Ocean
Gledhill, M.
Iron
Ocean
Biogeochemistry
Trace metals
Chemical speciation
title_short Chemical controls on iron distributions across the subsurface South Pacific Ocean
title_full Chemical controls on iron distributions across the subsurface South Pacific Ocean
title_fullStr Chemical controls on iron distributions across the subsurface South Pacific Ocean
title_full_unstemmed Chemical controls on iron distributions across the subsurface South Pacific Ocean
title_sort Chemical controls on iron distributions across the subsurface South Pacific Ocean
dc.creator.none.fl_str_mv Gledhill, M.
Gosnell, K.
Humphreys, M. P.
Delaigue, L.
Helle, N.
Zhu, K.
Lodeiro, Pablo
Rey-Castro, Carlos
Achterberg, E.P.
author Gledhill, M.
author_facet Gledhill, M.
Gosnell, K.
Humphreys, M. P.
Delaigue, L.
Helle, N.
Zhu, K.
Lodeiro, Pablo
Rey-Castro, Carlos
Achterberg, E.P.
author_role author
author2 Gosnell, K.
Humphreys, M. P.
Delaigue, L.
Helle, N.
Zhu, K.
Lodeiro, Pablo
Rey-Castro, Carlos
Achterberg, E.P.
author2_role author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Iron
Ocean
Biogeochemistry
Trace metals
Chemical speciation
topic Iron
Ocean
Biogeochemistry
Trace metals
Chemical speciation
description Iron and nitrogen are the primary nutrients that limit productivity in the ocean. While nitrogen cycling is largely controlled by biology, iron cycling is strongly determined by chemistry because iron losses are driven by abiotic formation of authigenic iron hydroxides (authFeOH). Here, we apply a mechanistic approach to examine how organic matter across the dissolved-particulate size spectrum controls authFeOH formation in subsurface waters (>250 m) of the South Pacific Ocean. We find that accounting for the chemical heterogeneity of organic matter is essential for predicting widespread authFeOH formation. Predicted dissolved and particulate iron concentrations matched observations in the ocean interior, while discrepancies were linked to kinetic control of authFeOH formation or inputs of particles from the seafloor. Our results highlight the need to represent complexity in abiotic interactions to better resolve the interplay of chemical and biological controls on ocean iron cycling.
publishDate 2025
dc.date.none.fl_str_mv 2025
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/submittedVersion
format article
status_str submittedVersion
dc.identifier.none.fl_str_mv https://doi.org/10.26434/chemrxiv-2025-2xl81
https://hdl.handle.net/10459.1/469237
url https://doi.org/10.26434/chemrxiv-2025-2xl81
https://hdl.handle.net/10459.1/469237
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Versió preprint del document publicat a: https://doi.org/10.26434/chemrxiv-2025-2xl81
Earth, Space, and Environmental Chemistry, 2025, p.1-19
dc.rights.none.fl_str_mv cc-by-nc (c) Gledhill et al., 2025
Attribution-NonCommercial 4.0 International
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc/4.0/
rights_invalid_str_mv cc-by-nc (c) Gledhill et al., 2025
Attribution-NonCommercial 4.0 International
http://creativecommons.org/licenses/by-nc/4.0/
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv ChemRxiv
publisher.none.fl_str_mv ChemRxiv
dc.source.none.fl_str_mv reponame:Recercat. Dipósit de la Recerca de Catalunya
instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
instname_str Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
reponame_str Recercat. Dipósit de la Recerca de Catalunya
collection Recercat. Dipósit de la Recerca de Catalunya
repository.name.fl_str_mv
repository.mail.fl_str_mv
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