Cadmium and phosphate in coastal Antarctic seawater: implications for Southern Ocean nutrient cycling
Cadmium is a biologically important trace metal that co-varies with phosphate (PO43− or Dissolved Inorganic Phosphate, DIP) in seawater. However, the exact nature of Cd uptake mechanisms and the relationship with phosphate and other nutrients in global oceans remain elusive. Here, we present a time...
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Online Access: | https://orca.cardiff.ac.uk/id/eprint/7521/ https://doi.org/10.1016/j.marchem.2008.09.004 |
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ftunivcardiff:oai:https://orca.cardiff.ac.uk:7521 2023-05-15T13:46:03+02:00 Cadmium and phosphate in coastal Antarctic seawater: implications for Southern Ocean nutrient cycling Hendry, Katharine Rosemary Rickaby, Rosalind E. M. De Hoog, Jan C. M. Weston, Keith Rehkämper, Mark 2008-12 https://orca.cardiff.ac.uk/id/eprint/7521/ https://doi.org/10.1016/j.marchem.2008.09.004 unknown Elsevier Hendry, Katharine Rosemary, Rickaby, Rosalind E. M., De Hoog, Jan C. M., Weston, Keith and Rehkämper, Mark 2008. Cadmium and phosphate in coastal Antarctic seawater: implications for Southern Ocean nutrient cycling. Marine Chemistry 112 (3-4) , pp. 149-157. 10.1016/j.marchem.2008.09.004 https://doi.org/10.1016/j.marchem.2008.09.004 doi:10.1016/j.marchem.2008.09.004 Article PeerReviewed 2008 ftunivcardiff https://doi.org/10.1016/j.marchem.2008.09.004 2022-09-25T20:16:07Z Cadmium is a biologically important trace metal that co-varies with phosphate (PO43− or Dissolved Inorganic Phosphate, DIP) in seawater. However, the exact nature of Cd uptake mechanisms and the relationship with phosphate and other nutrients in global oceans remain elusive. Here, we present a time series study of Cd and PO43− from coastal Antarctic seawater, showing that Cd co-varies with macronutrients during times of high biological activity even under nutrient and trace metal replete conditions. Our data imply that Cd/PO43− in coastal surface Antarctic seawater is higher than open ocean areas. Furthermore, the sinking of some proportion of this high Cd/PO43− water into Antarctic Bottom Water, followed by mixing into Circumpolar Deep Water, impacts Southern Ocean preformed nutrient and trace metal composition. A simple model of endmember water mass mixing with a particle fractionation of Cd/P (αCd–P) determined by the local environment can be used to account for the Cd/PO43− relationship in different parts of the ocean. The high Cd/PO43− of the coastal water is a consequence of two factors: the high input from terrestrial and continental shelf sediments and changes in biological fractionation with respect to P during uptake of Cd in regions of high Fe and Zn. This implies that the Cd/PO43− ratio of the Southern Ocean will vary on glacial–interglacial timescales as the proportion of deep water originating on the continental shelves of the Weddell Sea is reduced during glaciations because the ice shelf is pinned at the edge of the continental shelf. There could also be variations in biological fractionation of Cd/P in the surface waters of the Southern Ocean on these timescales as a result of changes in atmospheric inputs of trace metals. Further variations in the relationship between Cd and PO43− in seawater arise from changes in population structure and community requirements for macro- and micronutrients. Article in Journal/Newspaper Antarc* Antarctic Ice Shelf Southern Ocean Weddell Sea Cardiff University: ORCA (Online Research @ Cardiff) Antarctic Southern Ocean Weddell Sea Weddell Marine Chemistry 112 3-4 149 157 |
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Open Polar |
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Cardiff University: ORCA (Online Research @ Cardiff) |
op_collection_id |
ftunivcardiff |
language |
unknown |
description |
Cadmium is a biologically important trace metal that co-varies with phosphate (PO43− or Dissolved Inorganic Phosphate, DIP) in seawater. However, the exact nature of Cd uptake mechanisms and the relationship with phosphate and other nutrients in global oceans remain elusive. Here, we present a time series study of Cd and PO43− from coastal Antarctic seawater, showing that Cd co-varies with macronutrients during times of high biological activity even under nutrient and trace metal replete conditions. Our data imply that Cd/PO43− in coastal surface Antarctic seawater is higher than open ocean areas. Furthermore, the sinking of some proportion of this high Cd/PO43− water into Antarctic Bottom Water, followed by mixing into Circumpolar Deep Water, impacts Southern Ocean preformed nutrient and trace metal composition. A simple model of endmember water mass mixing with a particle fractionation of Cd/P (αCd–P) determined by the local environment can be used to account for the Cd/PO43− relationship in different parts of the ocean. The high Cd/PO43− of the coastal water is a consequence of two factors: the high input from terrestrial and continental shelf sediments and changes in biological fractionation with respect to P during uptake of Cd in regions of high Fe and Zn. This implies that the Cd/PO43− ratio of the Southern Ocean will vary on glacial–interglacial timescales as the proportion of deep water originating on the continental shelves of the Weddell Sea is reduced during glaciations because the ice shelf is pinned at the edge of the continental shelf. There could also be variations in biological fractionation of Cd/P in the surface waters of the Southern Ocean on these timescales as a result of changes in atmospheric inputs of trace metals. Further variations in the relationship between Cd and PO43− in seawater arise from changes in population structure and community requirements for macro- and micronutrients. |
format |
Article in Journal/Newspaper |
author |
Hendry, Katharine Rosemary Rickaby, Rosalind E. M. De Hoog, Jan C. M. Weston, Keith Rehkämper, Mark |
spellingShingle |
Hendry, Katharine Rosemary Rickaby, Rosalind E. M. De Hoog, Jan C. M. Weston, Keith Rehkämper, Mark Cadmium and phosphate in coastal Antarctic seawater: implications for Southern Ocean nutrient cycling |
author_facet |
Hendry, Katharine Rosemary Rickaby, Rosalind E. M. De Hoog, Jan C. M. Weston, Keith Rehkämper, Mark |
author_sort |
Hendry, Katharine Rosemary |
title |
Cadmium and phosphate in coastal Antarctic seawater: implications for Southern Ocean nutrient cycling |
title_short |
Cadmium and phosphate in coastal Antarctic seawater: implications for Southern Ocean nutrient cycling |
title_full |
Cadmium and phosphate in coastal Antarctic seawater: implications for Southern Ocean nutrient cycling |
title_fullStr |
Cadmium and phosphate in coastal Antarctic seawater: implications for Southern Ocean nutrient cycling |
title_full_unstemmed |
Cadmium and phosphate in coastal Antarctic seawater: implications for Southern Ocean nutrient cycling |
title_sort |
cadmium and phosphate in coastal antarctic seawater: implications for southern ocean nutrient cycling |
publisher |
Elsevier |
publishDate |
2008 |
url |
https://orca.cardiff.ac.uk/id/eprint/7521/ https://doi.org/10.1016/j.marchem.2008.09.004 |
geographic |
Antarctic Southern Ocean Weddell Sea Weddell |
geographic_facet |
Antarctic Southern Ocean Weddell Sea Weddell |
genre |
Antarc* Antarctic Ice Shelf Southern Ocean Weddell Sea |
genre_facet |
Antarc* Antarctic Ice Shelf Southern Ocean Weddell Sea |
op_relation |
Hendry, Katharine Rosemary, Rickaby, Rosalind E. M., De Hoog, Jan C. M., Weston, Keith and Rehkämper, Mark 2008. Cadmium and phosphate in coastal Antarctic seawater: implications for Southern Ocean nutrient cycling. Marine Chemistry 112 (3-4) , pp. 149-157. 10.1016/j.marchem.2008.09.004 https://doi.org/10.1016/j.marchem.2008.09.004 doi:10.1016/j.marchem.2008.09.004 |
op_doi |
https://doi.org/10.1016/j.marchem.2008.09.004 |
container_title |
Marine Chemistry |
container_volume |
112 |
container_issue |
3-4 |
container_start_page |
149 |
op_container_end_page |
157 |
_version_ |
1766235419491434496 |