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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ftanucanberra:oai:openresearch-repository.anu.edu.au:1885/217353 2024-01-14T10:10:52+01:00 Some observations on the biogeochemical cycling of zinc in the Australian sector of the Southern Ocean: a dedication to Keith Hunter Ellwood, Michael Strzepek, Robert Chen, Xiaoyu Trull, Thomas W Boyd, Phillip application/pdf http://hdl.handle.net/1885/217353 https://doi.org/10.1071/MF19200 https://openresearch-repository.anu.edu.au/bitstream/1885/217353/3/01_Ellwood_Some_observations_on_the_2020.pdf.jpg en_AU eng CSLI Publications http://purl.org/au-research/grants/arc/DP170102108 http://purl.org/au-research/grants/arc/DP130100679 1323-1650 http://hdl.handle.net/1885/217353 doi:10.1071/MF19200 https://openresearch-repository.anu.edu.au/bitstream/1885/217353/3/01_Ellwood_Some_observations_on_the_2020.pdf.jpg © CSIRO 2020 https://creativecommons.org/licenses/by-nc-nd/4.0/ CC BY-NC-ND Marine and Freshwater Research Journal article ftanucanberra https://doi.org/10.1071/MF19200 2023-12-15T09:38:03Z 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. This research was supported financially under the Australian Research Council’s Discovery Program (DP170102108; DP130100679) and ship time from Australia’s Marine National Facility (IN2016_V02 and IN2017_V02). Article in Journal/Newspaper Southern Ocean Australian National University: ANU Digital Collections Southern Ocean Marine and Freshwater Research 71 3 355 |
institution |
Open Polar |
collection |
Australian National University: ANU Digital Collections |
op_collection_id |
ftanucanberra |
language |
English |
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. This research was supported financially under the Australian Research Council’s Discovery Program (DP170102108; DP130100679) and ship time from Australia’s Marine National Facility (IN2016_V02 and IN2017_V02). |
format |
Article in Journal/Newspaper |
author |
Ellwood, Michael Strzepek, Robert Chen, Xiaoyu Trull, Thomas W Boyd, Phillip |
spellingShingle |
Ellwood, Michael Strzepek, Robert Chen, Xiaoyu Trull, Thomas W Boyd, Phillip Some observations on the biogeochemical cycling of zinc in the Australian sector of the Southern Ocean: a dedication to Keith Hunter |
author_facet |
Ellwood, Michael Strzepek, Robert Chen, Xiaoyu Trull, Thomas W Boyd, Phillip |
author_sort |
Ellwood, Michael |
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 |
CSLI Publications |
url |
http://hdl.handle.net/1885/217353 https://doi.org/10.1071/MF19200 https://openresearch-repository.anu.edu.au/bitstream/1885/217353/3/01_Ellwood_Some_observations_on_the_2020.pdf.jpg |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Marine and Freshwater Research |
op_relation |
http://purl.org/au-research/grants/arc/DP170102108 http://purl.org/au-research/grants/arc/DP130100679 1323-1650 http://hdl.handle.net/1885/217353 doi:10.1071/MF19200 https://openresearch-repository.anu.edu.au/bitstream/1885/217353/3/01_Ellwood_Some_observations_on_the_2020.pdf.jpg |
op_rights |
© CSIRO 2020 https://creativecommons.org/licenses/by-nc-nd/4.0/ CC BY-NC-ND |
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_ |
1788065728440565760 |