The Zn abundance and isotopic composition of diatom frustules, a proxy for Zn availability in ocean surface seawater
We have developed cleaning methods for extracting diatomopal from bulk marine sediment samples, for measurement of both zinc (Zn) abundance and isotope composition. This cleaning technique was then applied to a set of Holocene core-top samples from the Southern Ocean. The measured δ66Zn (reported re...
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ftanucanberra:oai:digitalcollections.anu.edu.au:1885/65148 2023-05-15T18:25:11+02:00 The Zn abundance and isotopic composition of diatom frustules, a proxy for Zn availability in ocean surface seawater Andersen, Morten Vance, Derek Archer, Corey Anderson, Robert F. Ellwood, Michael Allen, Claire S. 2015-12-10T23:16:38Z http://hdl.handle.net/1885/65148 unknown Elsevier 0012-821X http://hdl.handle.net/1885/65148 Earth and Planetary Science Letters Journal article 2015 ftanucanberra 2015-12-28T23:32:57Z We have developed cleaning methods for extracting diatomopal from bulk marine sediment samples, for measurement of both zinc (Zn) abundance and isotope composition. This cleaning technique was then applied to a set of Holocene core-top samples from the Southern Ocean. The measured δ66Zn (reported relative to the JMCLyon standard) and Zn/Si ratios from the Southern Ocean diatomopal samples range from 0.7 to 1.5%, and from 14 to 0.9 mol/mol, respectively. The Zn abundance and isotope composition data show a clear correlation with opal burial rates and other oceanographic parameters. In common with previous work, we interpret the systematic changes in the Zn/Si ratio to be linked to the variability in the concentrations of bioavailable Zn in the ambient surface seawater where the diatom opal is formed. This variability is likely to be primarily controlled by the degree to which Zn is taken up into phytoplankton biomass. The observed systematic pattern in the δ66Zn compositions of the diatomopal core-top samples is, similarly, likely to reflect changes in the δ66Zn composition of the ambient Zn in the surface waters above the core-top sites, which is progressively driven towards isotopically heavier values by preferential incorporation of the lighter isotopes into phytoplankton organic material. Thus, the systematic relationship between Zn isotopes and abundance observed in the core-top diatomopal samples suggests a potential tool for investigating the biogeochemical cycling of Zn in the past surface ocean for down-core diatomopal material. In this respect, it may be possible to test hypotheses that attribute variations in atmospheric CO2 on glacial-interglacial timescales to the degree to which trace metals limited primary productivity in HNLC zones. Article in Journal/Newspaper Southern Ocean Australian National University: ANU Digital Collections Southern Ocean |
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Australian National University: ANU Digital Collections |
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ftanucanberra |
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description |
We have developed cleaning methods for extracting diatomopal from bulk marine sediment samples, for measurement of both zinc (Zn) abundance and isotope composition. This cleaning technique was then applied to a set of Holocene core-top samples from the Southern Ocean. The measured δ66Zn (reported relative to the JMCLyon standard) and Zn/Si ratios from the Southern Ocean diatomopal samples range from 0.7 to 1.5%, and from 14 to 0.9 mol/mol, respectively. The Zn abundance and isotope composition data show a clear correlation with opal burial rates and other oceanographic parameters. In common with previous work, we interpret the systematic changes in the Zn/Si ratio to be linked to the variability in the concentrations of bioavailable Zn in the ambient surface seawater where the diatom opal is formed. This variability is likely to be primarily controlled by the degree to which Zn is taken up into phytoplankton biomass. The observed systematic pattern in the δ66Zn compositions of the diatomopal core-top samples is, similarly, likely to reflect changes in the δ66Zn composition of the ambient Zn in the surface waters above the core-top sites, which is progressively driven towards isotopically heavier values by preferential incorporation of the lighter isotopes into phytoplankton organic material. Thus, the systematic relationship between Zn isotopes and abundance observed in the core-top diatomopal samples suggests a potential tool for investigating the biogeochemical cycling of Zn in the past surface ocean for down-core diatomopal material. In this respect, it may be possible to test hypotheses that attribute variations in atmospheric CO2 on glacial-interglacial timescales to the degree to which trace metals limited primary productivity in HNLC zones. |
format |
Article in Journal/Newspaper |
author |
Andersen, Morten Vance, Derek Archer, Corey Anderson, Robert F. Ellwood, Michael Allen, Claire S. |
spellingShingle |
Andersen, Morten Vance, Derek Archer, Corey Anderson, Robert F. Ellwood, Michael Allen, Claire S. The Zn abundance and isotopic composition of diatom frustules, a proxy for Zn availability in ocean surface seawater |
author_facet |
Andersen, Morten Vance, Derek Archer, Corey Anderson, Robert F. Ellwood, Michael Allen, Claire S. |
author_sort |
Andersen, Morten |
title |
The Zn abundance and isotopic composition of diatom frustules, a proxy for Zn availability in ocean surface seawater |
title_short |
The Zn abundance and isotopic composition of diatom frustules, a proxy for Zn availability in ocean surface seawater |
title_full |
The Zn abundance and isotopic composition of diatom frustules, a proxy for Zn availability in ocean surface seawater |
title_fullStr |
The Zn abundance and isotopic composition of diatom frustules, a proxy for Zn availability in ocean surface seawater |
title_full_unstemmed |
The Zn abundance and isotopic composition of diatom frustules, a proxy for Zn availability in ocean surface seawater |
title_sort |
zn abundance and isotopic composition of diatom frustules, a proxy for zn availability in ocean surface seawater |
publisher |
Elsevier |
publishDate |
2015 |
url |
http://hdl.handle.net/1885/65148 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Earth and Planetary Science Letters |
op_relation |
0012-821X http://hdl.handle.net/1885/65148 |
_version_ |
1766206447638544384 |