Dissolved cadmium in the Southern Ocean: Distribution, speciation, and relation to phosphate
We report isotope dilution analyses of dissolved cadmium (Cd) and electrochemical Cd speciation mea-surements in the Atlantic sector of the Southern Ocean. Bioavailable inorganic Cd is. 100 times higher in near-surface waters south of the Polar Front compared to the Subantarctic Zone because of upwe...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.635.891 2023-05-15T13:38:43+02:00 Dissolved cadmium in the Southern Ocean: Distribution, speciation, and relation to phosphate Oliver Baars Wafa Abouchami Stephen J. G. Galer Marie Boye Peter L. Croot The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.635.891 http://hal-sde.archives-ouvertes.fr/docs/01/01/97/59/PDF/Baars_et_al_2014.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.635.891 http://hal-sde.archives-ouvertes.fr/docs/01/01/97/59/PDF/Baars_et_al_2014.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://hal-sde.archives-ouvertes.fr/docs/01/01/97/59/PDF/Baars_et_al_2014.pdf text ftciteseerx 2016-01-08T15:42:05Z We report isotope dilution analyses of dissolved cadmium (Cd) and electrochemical Cd speciation mea-surements in the Atlantic sector of the Southern Ocean. Bioavailable inorganic Cd is. 100 times higher in near-surface waters south of the Polar Front compared to the Subantarctic Zone because of upwelling and reduced complexation by organic Cd ligands. To trace local changes in the relation between Cd and P, we examine the deviations from a linear deep-water Cd vs. P relation (Cd*), and find that changes in Cd * coincide with the position of frontal systems and covary with primary productivity and total dissolved Mn and Fe concentrations. These covariations agree with potential local changes in phytoplankton Cd uptake rates, resulting from differences in the availability of Cd, Zn, Mn, and Fe. A band of negative Cd * values is associated with formation of Subantarctic Mode Water (SAMW) and Antarctic Intermediate Water (AAIW). In contrast to SAMW, which may export low Cd: P ratios from the Southern Ocean, the Cd: P ratios in AAIW increase by mixing with underlying Upper Circumpolar Deep Water before being exported from the Southern Ocean. Deep waters show constant Cd: P ratios, and both elements behave conservatively with end-member mixing between deep waters of the Weddell Gyre, the Antarctic Circumpolar Current, and inflowing North Atlantic Deep Water. Overall, our results support the hypothesis that the kink in the global Cd vs. P relation is largely caused by high Cd: P uptake Text Antarc* Antarctic North Atlantic Deep Water North Atlantic Southern Ocean Unknown Antarctic Southern Ocean The Antarctic Weddell |
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English |
description |
We report isotope dilution analyses of dissolved cadmium (Cd) and electrochemical Cd speciation mea-surements in the Atlantic sector of the Southern Ocean. Bioavailable inorganic Cd is. 100 times higher in near-surface waters south of the Polar Front compared to the Subantarctic Zone because of upwelling and reduced complexation by organic Cd ligands. To trace local changes in the relation between Cd and P, we examine the deviations from a linear deep-water Cd vs. P relation (Cd*), and find that changes in Cd * coincide with the position of frontal systems and covary with primary productivity and total dissolved Mn and Fe concentrations. These covariations agree with potential local changes in phytoplankton Cd uptake rates, resulting from differences in the availability of Cd, Zn, Mn, and Fe. A band of negative Cd * values is associated with formation of Subantarctic Mode Water (SAMW) and Antarctic Intermediate Water (AAIW). In contrast to SAMW, which may export low Cd: P ratios from the Southern Ocean, the Cd: P ratios in AAIW increase by mixing with underlying Upper Circumpolar Deep Water before being exported from the Southern Ocean. Deep waters show constant Cd: P ratios, and both elements behave conservatively with end-member mixing between deep waters of the Weddell Gyre, the Antarctic Circumpolar Current, and inflowing North Atlantic Deep Water. Overall, our results support the hypothesis that the kink in the global Cd vs. P relation is largely caused by high Cd: P uptake |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Oliver Baars Wafa Abouchami Stephen J. G. Galer Marie Boye Peter L. Croot |
spellingShingle |
Oliver Baars Wafa Abouchami Stephen J. G. Galer Marie Boye Peter L. Croot Dissolved cadmium in the Southern Ocean: Distribution, speciation, and relation to phosphate |
author_facet |
Oliver Baars Wafa Abouchami Stephen J. G. Galer Marie Boye Peter L. Croot |
author_sort |
Oliver Baars |
title |
Dissolved cadmium in the Southern Ocean: Distribution, speciation, and relation to phosphate |
title_short |
Dissolved cadmium in the Southern Ocean: Distribution, speciation, and relation to phosphate |
title_full |
Dissolved cadmium in the Southern Ocean: Distribution, speciation, and relation to phosphate |
title_fullStr |
Dissolved cadmium in the Southern Ocean: Distribution, speciation, and relation to phosphate |
title_full_unstemmed |
Dissolved cadmium in the Southern Ocean: Distribution, speciation, and relation to phosphate |
title_sort |
dissolved cadmium in the southern ocean: distribution, speciation, and relation to phosphate |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.635.891 http://hal-sde.archives-ouvertes.fr/docs/01/01/97/59/PDF/Baars_et_al_2014.pdf |
geographic |
Antarctic Southern Ocean The Antarctic Weddell |
geographic_facet |
Antarctic Southern Ocean The Antarctic Weddell |
genre |
Antarc* Antarctic North Atlantic Deep Water North Atlantic Southern Ocean |
genre_facet |
Antarc* Antarctic North Atlantic Deep Water North Atlantic Southern Ocean |
op_source |
http://hal-sde.archives-ouvertes.fr/docs/01/01/97/59/PDF/Baars_et_al_2014.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.635.891 http://hal-sde.archives-ouvertes.fr/docs/01/01/97/59/PDF/Baars_et_al_2014.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766110344334278656 |