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Overlooked riverine contributions of dissolved neodymium and hafnium to the Amazon estuary and oceans

The Amazon River accounts for 20% of global freshwater runoff and supplies vital trace metals to the Atlantic Ocean. Suspended particles within its plume are thought to partially dissolve, constituting a large potential source of metals, which is, however, not well constrained. Here we used combined...

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Autores principales: Xu, Antao, Hathorne, Ed, Laukert, Georgi, Frank, Martin
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10338505/
https://www.ncbi.nlm.nih.gov/pubmed/37438393
http://dx.doi.org/10.1038/s41467-023-39922-3
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author Xu, Antao
Hathorne, Ed
Laukert, Georgi
Frank, Martin
author_facet Xu, Antao
Hathorne, Ed
Laukert, Georgi
Frank, Martin
author_sort Xu, Antao
collection PubMed
description The Amazon River accounts for 20% of global freshwater runoff and supplies vital trace metals to the Atlantic Ocean. Suspended particles within its plume are thought to partially dissolve, constituting a large potential source of metals, which is, however, not well constrained. Here we used combined neodymium (Nd) and hafnium (Hf) isotopes to disprove the release of Nd and Hf from particles as the cause of the observed dissolved concentration increases and isotopic variability across the plume. Instead, the changes reflect admixture of nearby Pará River freshwater with exceptionally high dissolved Nd and Hf concentrations contributing 45–100% of the riverine fraction to the southern and outer estuary. This result led us to develop an empirical relationship between riverine Nd concentration and pH to revise the global dissolved riverine Nd flux, which accordingly is at least three times higher than commonly used estimates. Future work should focus on contributions of low-pH rivers to global metal fluxes.
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spelling pubmed-103385052023-07-14 Overlooked riverine contributions of dissolved neodymium and hafnium to the Amazon estuary and oceans Xu, Antao Hathorne, Ed Laukert, Georgi Frank, Martin Nat Commun Article The Amazon River accounts for 20% of global freshwater runoff and supplies vital trace metals to the Atlantic Ocean. Suspended particles within its plume are thought to partially dissolve, constituting a large potential source of metals, which is, however, not well constrained. Here we used combined neodymium (Nd) and hafnium (Hf) isotopes to disprove the release of Nd and Hf from particles as the cause of the observed dissolved concentration increases and isotopic variability across the plume. Instead, the changes reflect admixture of nearby Pará River freshwater with exceptionally high dissolved Nd and Hf concentrations contributing 45–100% of the riverine fraction to the southern and outer estuary. This result led us to develop an empirical relationship between riverine Nd concentration and pH to revise the global dissolved riverine Nd flux, which accordingly is at least three times higher than commonly used estimates. Future work should focus on contributions of low-pH rivers to global metal fluxes. Nature Publishing Group UK 2023-07-12 /pmc/articles/PMC10338505/ /pubmed/37438393 http://dx.doi.org/10.1038/s41467-023-39922-3 Text en © The Author(s) 2023 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Xu, Antao
Hathorne, Ed
Laukert, Georgi
Frank, Martin
Overlooked riverine contributions of dissolved neodymium and hafnium to the Amazon estuary and oceans
title Overlooked riverine contributions of dissolved neodymium and hafnium to the Amazon estuary and oceans
title_full Overlooked riverine contributions of dissolved neodymium and hafnium to the Amazon estuary and oceans
title_fullStr Overlooked riverine contributions of dissolved neodymium and hafnium to the Amazon estuary and oceans
title_full_unstemmed Overlooked riverine contributions of dissolved neodymium and hafnium to the Amazon estuary and oceans
title_short Overlooked riverine contributions of dissolved neodymium and hafnium to the Amazon estuary and oceans
title_sort overlooked riverine contributions of dissolved neodymium and hafnium to the amazon estuary and oceans
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10338505/
https://www.ncbi.nlm.nih.gov/pubmed/37438393
http://dx.doi.org/10.1038/s41467-023-39922-3
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