Some observations on the biogeochemical cycling of zinc in the Australian sector of the Southern Ocean: a dedication to Keith Hunter
In this study we investigated the distribution of dissolved and particulate zinc (dZn and pZn respectively) and its isotopes in the Subantarctic Zone as part of a Geotraces Process voyage. dZn and pZn depth profiles contrasted each other, with dZn showing depletion within the euphotic zone while pZn...
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ftunivtasmania:oai:eprints.utas.edu.au:32518 2023-05-15T18:25:04+02:00 Some observations on the biogeochemical cycling of zinc in the Australian sector of the Southern Ocean: a dedication to Keith Hunter Ellwood, MJ Strzepek, R Chen, X Trull, TW Boyd, PW 2020 application/pdf https://eprints.utas.edu.au/32518/ https://eprints.utas.edu.au/32518/1/137723%20-%20Some%20observations%20on%20the%20biogeochemical%20cycling%20of%20zinc.pdf en eng C S I R O Publishing https://eprints.utas.edu.au/32518/1/137723%20-%20Some%20observations%20on%20the%20biogeochemical%20cycling%20of%20zinc.pdf Ellwood, MJ, Strzepek, R orcid:0000-0002-6442-7121 , Chen, X, Trull, TW and Boyd, PW orcid:0000-0001-7850-1911 2020 , 'Some observations on the biogeochemical cycling of zinc in the Australian sector of the Southern Ocean: a dedication to Keith Hunter' , Marine and Freshwater Research, vol. 71, no. 3 , pp. 355-373 , doi:10.1071/MF19200 <http://dx.doi.org/10.1071/MF19200>. zinc isotope fractionation biogeochemistry Southern Ocean Article PeerReviewed 2020 ftunivtasmania https://doi.org/10.1071/MF19200 2021-09-20T22:18:28Z In this study we investigated the distribution of dissolved and particulate zinc (dZn and pZn respectively) and its isotopes in the Subantarctic Zone as part of a Geotraces Process voyage. dZn and pZn depth profiles contrasted each other, with dZn showing depletion within the euphotic zone while pZn profiles showed enrichment. Fitting a power law equation to the pZn profiles produced an attenuation factor of 0.82, which contrasted values for particulate phosphorus, cadmium and copper. The results indicate that zinc has a longer regeneration length scale than phosphorus and cadmium, but shorter than copper. The differential regeneration of pZn relative to that of particulate phosphorus likely explains why dZn appears to have a deeper regeneration profile than that of phosphate. The dZn isotope (δ66Zndissolved) profiles collected across the Subantarctic Zone showed differing profile structures. For one station collected within an isolated cold-core eddy (CCE), δ66Zndissolved showed surface enrichment relative to deep waters. The corresponding pZn isotope profiles within the CCE did not show enrichment; rather, they were subtly depleted in surface waters and then converged to similar values at depth. Zinc isotope fractionation can be explained through a combination of fractionation processes associated with uptake by phytoplankton, zinc complexation by natural organic ligands and zinc regeneration from particulate matter. Article in Journal/Newspaper Southern Ocean University of Tasmania: UTas ePrints Southern Ocean Marine and Freshwater Research 71 3 355 |
institution |
Open Polar |
collection |
University of Tasmania: UTas ePrints |
op_collection_id |
ftunivtasmania |
language |
English |
topic |
zinc isotope fractionation biogeochemistry Southern Ocean |
spellingShingle |
zinc isotope fractionation biogeochemistry Southern Ocean Ellwood, MJ Strzepek, R Chen, X Trull, TW Boyd, PW Some observations on the biogeochemical cycling of zinc in the Australian sector of the Southern Ocean: a dedication to Keith Hunter |
topic_facet |
zinc isotope fractionation biogeochemistry Southern Ocean |
description |
In this study we investigated the distribution of dissolved and particulate zinc (dZn and pZn respectively) and its isotopes in the Subantarctic Zone as part of a Geotraces Process voyage. dZn and pZn depth profiles contrasted each other, with dZn showing depletion within the euphotic zone while pZn profiles showed enrichment. Fitting a power law equation to the pZn profiles produced an attenuation factor of 0.82, which contrasted values for particulate phosphorus, cadmium and copper. The results indicate that zinc has a longer regeneration length scale than phosphorus and cadmium, but shorter than copper. The differential regeneration of pZn relative to that of particulate phosphorus likely explains why dZn appears to have a deeper regeneration profile than that of phosphate. The dZn isotope (δ66Zndissolved) profiles collected across the Subantarctic Zone showed differing profile structures. For one station collected within an isolated cold-core eddy (CCE), δ66Zndissolved showed surface enrichment relative to deep waters. The corresponding pZn isotope profiles within the CCE did not show enrichment; rather, they were subtly depleted in surface waters and then converged to similar values at depth. Zinc isotope fractionation can be explained through a combination of fractionation processes associated with uptake by phytoplankton, zinc complexation by natural organic ligands and zinc regeneration from particulate matter. |
format |
Article in Journal/Newspaper |
author |
Ellwood, MJ Strzepek, R Chen, X Trull, TW Boyd, PW |
author_facet |
Ellwood, MJ Strzepek, R Chen, X Trull, TW Boyd, PW |
author_sort |
Ellwood, MJ |
title |
Some observations on the biogeochemical cycling of zinc in the Australian sector of the Southern Ocean: a dedication to Keith Hunter |
title_short |
Some observations on the biogeochemical cycling of zinc in the Australian sector of the Southern Ocean: a dedication to Keith Hunter |
title_full |
Some observations on the biogeochemical cycling of zinc in the Australian sector of the Southern Ocean: a dedication to Keith Hunter |
title_fullStr |
Some observations on the biogeochemical cycling of zinc in the Australian sector of the Southern Ocean: a dedication to Keith Hunter |
title_full_unstemmed |
Some observations on the biogeochemical cycling of zinc in the Australian sector of the Southern Ocean: a dedication to Keith Hunter |
title_sort |
some observations on the biogeochemical cycling of zinc in the australian sector of the southern ocean: a dedication to keith hunter |
publisher |
C S I R O Publishing |
publishDate |
2020 |
url |
https://eprints.utas.edu.au/32518/ https://eprints.utas.edu.au/32518/1/137723%20-%20Some%20observations%20on%20the%20biogeochemical%20cycling%20of%20zinc.pdf |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
https://eprints.utas.edu.au/32518/1/137723%20-%20Some%20observations%20on%20the%20biogeochemical%20cycling%20of%20zinc.pdf Ellwood, MJ, Strzepek, R orcid:0000-0002-6442-7121 , Chen, X, Trull, TW and Boyd, PW orcid:0000-0001-7850-1911 2020 , 'Some observations on the biogeochemical cycling of zinc in the Australian sector of the Southern Ocean: a dedication to Keith Hunter' , Marine and Freshwater Research, vol. 71, no. 3 , pp. 355-373 , doi:10.1071/MF19200 <http://dx.doi.org/10.1071/MF19200>. |
op_doi |
https://doi.org/10.1071/MF19200 |
container_title |
Marine and Freshwater Research |
container_volume |
71 |
container_issue |
3 |
container_start_page |
355 |
_version_ |
1766206244254646272 |