The vertical distribution of iron stable isotopes in the North Atlantic near Bermuda
Seawater dissolved iron isotope ratios (δ^(56)Fe) have been measured in the North Atlantic near Bermuda. In a full-depth profile, seawater dissolved δ^(56)Fe is isotopically heavy compared to crustal values throughout the water column (δ^(56)Fe_(IRMM-014) = +0.30‰ to +0.71‰). Iron isotope ratios are...
Published in: | Global Biogeochemical Cycles |
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American Geophysical Union
2012
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ftcaltechauth:oai:authors.library.caltech.edu:32361 2023-05-15T17:28:42+02:00 The vertical distribution of iron stable isotopes in the North Atlantic near Bermuda John, Seth G. Adkins, Jess 2012-06-15 application/pdf https://authors.library.caltech.edu/32361/ https://authors.library.caltech.edu/32361/1/John2012p18755Global_Biogeochem_Cy.pdf https://resolver.caltech.edu/CaltechAUTHORS:20120711-132003222 en eng American Geophysical Union https://authors.library.caltech.edu/32361/1/John2012p18755Global_Biogeochem_Cy.pdf John, Seth G. and Adkins, Jess (2012) The vertical distribution of iron stable isotopes in the North Atlantic near Bermuda. Global Biogeochemical Cycles, 26 . Art. No. GB2034. ISSN 0886-6236. doi:10.1029/2011GB004043. https://resolver.caltech.edu/CaltechAUTHORS:20120711-132003222 <https://resolver.caltech.edu/CaltechAUTHORS:20120711-132003222> other Article PeerReviewed 2012 ftcaltechauth https://doi.org/10.1029/2011GB004043 2021-11-11T18:50:13Z Seawater dissolved iron isotope ratios (δ^(56)Fe) have been measured in the North Atlantic near Bermuda. In a full-depth profile, seawater dissolved δ^(56)Fe is isotopically heavy compared to crustal values throughout the water column (δ^(56)Fe_(IRMM-014) = +0.30‰ to +0.71‰). Iron isotope ratios are relatively homogenous in the upper water column (between +0.30‰ to +0.45‰ above 1500 m), and δ^(56)Fe increases below this to a maximum of +0.71‰ at 2500 m, decreasing again to +0.35‰ at 4200 m. The δ^(56)Fe profile is very different from the iron concentration profile; in the upper water column [Fe] is variable while δ^(56)Fe is relatively constant, and in the deeper water column δ^(56)Fe varies while [Fe] remains relatively constant. The δ^(56)Fe profile is also not well correlated with other hydrographic tracers in the North Atlantic such as temperature, salinity, or the concentrations of oxygen, phosphate, silica, and CFC-11. The dissimilarity between δ^(56)Fe profiles and profiles of [Fe] and other hydrographic tracers shows that Fe isotope ratios provide a unique sort of information about ocean chemistry, and they suggest that Fe isotopes may therefore be a valuable new tool for tracing the global sources, sinks, and biogeochemical cycling of Fe. Article in Journal/Newspaper North Atlantic Caltech Authors (California Institute of Technology) Global Biogeochemical Cycles 26 2 n/a n/a |
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Caltech Authors (California Institute of Technology) |
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English |
description |
Seawater dissolved iron isotope ratios (δ^(56)Fe) have been measured in the North Atlantic near Bermuda. In a full-depth profile, seawater dissolved δ^(56)Fe is isotopically heavy compared to crustal values throughout the water column (δ^(56)Fe_(IRMM-014) = +0.30‰ to +0.71‰). Iron isotope ratios are relatively homogenous in the upper water column (between +0.30‰ to +0.45‰ above 1500 m), and δ^(56)Fe increases below this to a maximum of +0.71‰ at 2500 m, decreasing again to +0.35‰ at 4200 m. The δ^(56)Fe profile is very different from the iron concentration profile; in the upper water column [Fe] is variable while δ^(56)Fe is relatively constant, and in the deeper water column δ^(56)Fe varies while [Fe] remains relatively constant. The δ^(56)Fe profile is also not well correlated with other hydrographic tracers in the North Atlantic such as temperature, salinity, or the concentrations of oxygen, phosphate, silica, and CFC-11. The dissimilarity between δ^(56)Fe profiles and profiles of [Fe] and other hydrographic tracers shows that Fe isotope ratios provide a unique sort of information about ocean chemistry, and they suggest that Fe isotopes may therefore be a valuable new tool for tracing the global sources, sinks, and biogeochemical cycling of Fe. |
format |
Article in Journal/Newspaper |
author |
John, Seth G. Adkins, Jess |
spellingShingle |
John, Seth G. Adkins, Jess The vertical distribution of iron stable isotopes in the North Atlantic near Bermuda |
author_facet |
John, Seth G. Adkins, Jess |
author_sort |
John, Seth G. |
title |
The vertical distribution of iron stable isotopes in the North Atlantic near Bermuda |
title_short |
The vertical distribution of iron stable isotopes in the North Atlantic near Bermuda |
title_full |
The vertical distribution of iron stable isotopes in the North Atlantic near Bermuda |
title_fullStr |
The vertical distribution of iron stable isotopes in the North Atlantic near Bermuda |
title_full_unstemmed |
The vertical distribution of iron stable isotopes in the North Atlantic near Bermuda |
title_sort |
vertical distribution of iron stable isotopes in the north atlantic near bermuda |
publisher |
American Geophysical Union |
publishDate |
2012 |
url |
https://authors.library.caltech.edu/32361/ https://authors.library.caltech.edu/32361/1/John2012p18755Global_Biogeochem_Cy.pdf https://resolver.caltech.edu/CaltechAUTHORS:20120711-132003222 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://authors.library.caltech.edu/32361/1/John2012p18755Global_Biogeochem_Cy.pdf John, Seth G. and Adkins, Jess (2012) The vertical distribution of iron stable isotopes in the North Atlantic near Bermuda. Global Biogeochemical Cycles, 26 . Art. No. GB2034. ISSN 0886-6236. doi:10.1029/2011GB004043. https://resolver.caltech.edu/CaltechAUTHORS:20120711-132003222 <https://resolver.caltech.edu/CaltechAUTHORS:20120711-132003222> |
op_rights |
other |
op_doi |
https://doi.org/10.1029/2011GB004043 |
container_title |
Global Biogeochemical Cycles |
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26 |
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2 |
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1766121553496375296 |