Cadmium and phosphate in coastal Antarctic seawater : implications for Southern Ocean nutrient cycling
Author Posting. © The Author(s), 2008. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Marine Chemistry 112 (2008): 149-157, doi:10.1016/j.marchem.2008.09.004. Cadmium is...
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/4822 2023-05-15T13:53:14+02:00 Cadmium and phosphate in coastal Antarctic seawater : implications for Southern Ocean nutrient cycling Hendry, Katharine R. Rickaby, Rosalind E. M. de Hoog, Jan C. M. Weston, Keith Rehkamper, Mark 2008-09 application/pdf https://hdl.handle.net/1912/4822 en eng https://doi.org/10.1016/j.marchem.2008.09.004 https://hdl.handle.net/1912/4822 Cadmium Phosphate Coastal Nutrients Southern Ocean Preprint 2008 ftwhoas https://doi.org/10.1016/j.marchem.2008.09.004 2022-05-28T22:58:27Z Author Posting. © The Author(s), 2008. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Marine Chemistry 112 (2008): 149-157, doi:10.1016/j.marchem.2008.09.004. 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 remains 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 ... Report Antarc* Antarctic Ice Shelf Southern Ocean Weddell Sea Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Antarctic Southern Ocean Weddell Weddell Sea Marine Chemistry 112 3-4 149 157 |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
Cadmium Phosphate Coastal Nutrients Southern Ocean |
spellingShingle |
Cadmium Phosphate Coastal Nutrients Southern Ocean Hendry, Katharine R. Rickaby, Rosalind E. M. de Hoog, Jan C. M. Weston, Keith Rehkamper, Mark Cadmium and phosphate in coastal Antarctic seawater : implications for Southern Ocean nutrient cycling |
topic_facet |
Cadmium Phosphate Coastal Nutrients Southern Ocean |
description |
Author Posting. © The Author(s), 2008. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Marine Chemistry 112 (2008): 149-157, doi:10.1016/j.marchem.2008.09.004. 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 remains 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 ... |
format |
Report |
author |
Hendry, Katharine R. Rickaby, Rosalind E. M. de Hoog, Jan C. M. Weston, Keith Rehkamper, Mark |
author_facet |
Hendry, Katharine R. Rickaby, Rosalind E. M. de Hoog, Jan C. M. Weston, Keith Rehkamper, Mark |
author_sort |
Hendry, Katharine R. |
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 |
publishDate |
2008 |
url |
https://hdl.handle.net/1912/4822 |
geographic |
Antarctic Southern Ocean Weddell Weddell Sea |
geographic_facet |
Antarctic Southern Ocean Weddell Weddell Sea |
genre |
Antarc* Antarctic Ice Shelf Southern Ocean Weddell Sea |
genre_facet |
Antarc* Antarctic Ice Shelf Southern Ocean Weddell Sea |
op_relation |
https://doi.org/10.1016/j.marchem.2008.09.004 https://hdl.handle.net/1912/4822 |
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_ |
1766258235882340352 |