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 rat...
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ftcaltechauth:oai:authors.library.caltech.edu:57v89-p9108 2024-06-23T07:54:59+00:00 The vertical distribution of iron stable isotopes in the North Atlantic near Bermuda John, Seth G. Adkins, Jess 2012-06-15 https://doi.org/10.1029/2011GB004043 unknown American Geophysical Union https://doi.org/10.1029/2011GB004043 oai:authors.library.caltech.edu:57v89-p9108 eprintid:32361 resolverid:CaltechAUTHORS:20120711-132003222 info:eu-repo/semantics/openAccess Other Global Biogeochemical Cycles, 26, Art. No. GB2034, (2012-06-15) iron isotopes marine seawater info:eu-repo/semantics/article 2012 ftcaltechauth https://doi.org/10.1029/2011GB004043 2024-06-12T03:04:27Z 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. © 2012 American Geophysical Union. Received 27 January 2011; accepted 2 May 2012; published 15 June 2012. Thanks to all who helped and participated on the Geotraces Intercalibration I cruise, especially Chief Scientist Greg Cutter, Ed Boyle, Geoffrey Smith, and the captain and crew of the R/V Knorr. Published - John2012p18755Global_Biogeochem_Cy.pdf Article in Journal/Newspaper North Atlantic Caltech Authors (California Institute of Technology) Global Biogeochemical Cycles 26 2 |
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iron isotopes marine seawater |
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iron isotopes marine seawater John, Seth G. Adkins, Jess The vertical distribution of iron stable isotopes in the North Atlantic near Bermuda |
topic_facet |
iron isotopes marine seawater |
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. © 2012 American Geophysical Union. Received 27 January 2011; accepted 2 May 2012; published 15 June 2012. Thanks to all who helped and participated on the Geotraces Intercalibration I cruise, especially Chief Scientist Greg Cutter, Ed Boyle, Geoffrey Smith, and the captain and crew of the R/V Knorr. Published - John2012p18755Global_Biogeochem_Cy.pdf |
format |
Article in Journal/Newspaper |
author |
John, Seth G. Adkins, Jess |
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://doi.org/10.1029/2011GB004043 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Global Biogeochemical Cycles, 26, Art. No. GB2034, (2012-06-15) |
op_relation |
https://doi.org/10.1029/2011GB004043 oai:authors.library.caltech.edu:57v89-p9108 eprintid:32361 resolverid:CaltechAUTHORS:20120711-132003222 |
op_rights |
info:eu-repo/semantics/openAccess Other |
op_doi |
https://doi.org/10.1029/2011GB004043 |
container_title |
Global Biogeochemical Cycles |
container_volume |
26 |
container_issue |
2 |
_version_ |
1802647349284044800 |