Cadmium isotope variations in the Southern Ocean
Cadmium concentrations and isotope compositions were determined for 47 seawater samples from the high nutrient low chlorophyll (HNLC) zone of the Atlantic sector of the Southern Ocean. The samples include 13 surface waters from a transect of the Weddell Gyre and 3 depth profiles from the Weddell Sea...
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ftnioz:oai:imis.nioz.nl:240540 2023-05-15T13:47:57+02:00 Cadmium isotope variations in the Southern Ocean Xue, Z. Rehkämper, M. Horner, T.J. Abouchami, W. Middag, R. van de Flierd, T. de Baar, H.J.W. 2013 http://imis.nioz.nl/imis.php?module=ref&refid=240540 en eng info:eu-repo/semantics/altIdentifier/wos/000327229100018 info:eu-repo/semantics/altIdentifier/doi/oi.org/10.1016/j.epsl.2013.09.014 http://imis.nioz.nl/imis.php?module=ref&refid=240540 info:eu-repo/semantics/closedAccess %3Ci%3EEarth+Planet.+Sci.+Lett.+382%3C%2Fi%3E%3A+161%E2%80%93172.+%3Ca+href%3D%22http%3A%2F%2Fdx.doi.org%2F10.1016%2Fj.epsl.2013.09.014%22+target%3D%22_blank%22%3Ehttp%3A%2F%2Fdx.doi.org%2F10.1016%2Fj.epsl.2013.09.014%3C%2Fa%3E info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2013 ftnioz https://doi.org/10.1016/j.epsl.2013.09.014 2022-05-01T13:59:12Z Cadmium concentrations and isotope compositions were determined for 47 seawater samples from the high nutrient low chlorophyll (HNLC) zone of the Atlantic sector of the Southern Ocean. The samples include 13 surface waters from a transect of the Weddell Gyre and 3 depth profiles from the Weddell Sea and Drake Passage. The Southern Ocean mixed layer samples from this study and Abouchami et al. (2011) define a clear but broad ‘HNLC trend’ in a plot of View the MathML sourceeCd114/110 versus [Cd], which is primarily a consequence of isotopic fractionation associated with biological uptake (View the MathML sourceeCd114/110 is the deviation of the 114Cd/110Cd ratio of a sample from NIST SRM 3108 Cd in parts per 10,000). The trend is especially apparent in comparison to the large range of values shown by a global set of seawater Cd data for shallow depths. The Southern Ocean samples are also distinguished by their relatively high Cd concentrations (typically 0.2 to 0.6 nmol/kg) and moderately fractionated View the MathML sourceeCd114/110 (generally between +4 and +8) that reflect the limited biological productivity of this region. Detailed assessment reveals fine structure within the ‘HNLC trend’, which may record differences in the biological fractionation factor, different scenarios of closed and open system isotope fractionation, and/or distinct source water compositions.Southern Ocean seawater from depths ?1000 m has an average View the MathML sourceeCd114/110 of +2.5±0.2+2.5±0.2 (2se, n=16n=16), and together with previous results this establishes a relatively constant View the MathML sourceeCd114/110 value of +3.0±0.3+3.0±0.3 (2se, n=27n=27) for global deep waters. Significant isotopic variability was observed at intermediate depths in the Southern Ocean. Seawater from 200 m to 400 m in Weddell Sea has high Cd concentrations and View the MathML sourceeCd114/110 as low as +1, presumably due to remineralization of Cd from biomass that records incomplete nutrient utilization. Antarctic Intermediate Water, which was sampled at 150 to 750 m depth in the Drake Passage, features a distinct Cd isotope signature of View the MathML sourceeCd114/110˜+4, which reflects biological isotope fractionation at the surface and subsequent mixing into the ocean interior. Taken together, our results demonstrate that coupled Cd isotope and concentration data provide valuable insights into the distribution and biological cycling of Cd in the water column. The highly systematic nature of Cd isotope signatures may furthermore prove to be of utility for future research in marine geochemistry and paleoceanography. Article in Journal/Newspaper Antarc* Antarctic Drake Passage Southern Ocean Weddell Sea NIOZ Repository (Royal Netherlands Institute for Sea Research) Antarctic Southern Ocean Weddell Sea Drake Passage Weddell Earth and Planetary Science Letters 382 161 172 |
institution |
Open Polar |
collection |
NIOZ Repository (Royal Netherlands Institute for Sea Research) |
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ftnioz |
language |
English |
description |
Cadmium concentrations and isotope compositions were determined for 47 seawater samples from the high nutrient low chlorophyll (HNLC) zone of the Atlantic sector of the Southern Ocean. The samples include 13 surface waters from a transect of the Weddell Gyre and 3 depth profiles from the Weddell Sea and Drake Passage. The Southern Ocean mixed layer samples from this study and Abouchami et al. (2011) define a clear but broad ‘HNLC trend’ in a plot of View the MathML sourceeCd114/110 versus [Cd], which is primarily a consequence of isotopic fractionation associated with biological uptake (View the MathML sourceeCd114/110 is the deviation of the 114Cd/110Cd ratio of a sample from NIST SRM 3108 Cd in parts per 10,000). The trend is especially apparent in comparison to the large range of values shown by a global set of seawater Cd data for shallow depths. The Southern Ocean samples are also distinguished by their relatively high Cd concentrations (typically 0.2 to 0.6 nmol/kg) and moderately fractionated View the MathML sourceeCd114/110 (generally between +4 and +8) that reflect the limited biological productivity of this region. Detailed assessment reveals fine structure within the ‘HNLC trend’, which may record differences in the biological fractionation factor, different scenarios of closed and open system isotope fractionation, and/or distinct source water compositions.Southern Ocean seawater from depths ?1000 m has an average View the MathML sourceeCd114/110 of +2.5±0.2+2.5±0.2 (2se, n=16n=16), and together with previous results this establishes a relatively constant View the MathML sourceeCd114/110 value of +3.0±0.3+3.0±0.3 (2se, n=27n=27) for global deep waters. Significant isotopic variability was observed at intermediate depths in the Southern Ocean. Seawater from 200 m to 400 m in Weddell Sea has high Cd concentrations and View the MathML sourceeCd114/110 as low as +1, presumably due to remineralization of Cd from biomass that records incomplete nutrient utilization. Antarctic Intermediate Water, which was sampled at 150 to 750 m depth in the Drake Passage, features a distinct Cd isotope signature of View the MathML sourceeCd114/110˜+4, which reflects biological isotope fractionation at the surface and subsequent mixing into the ocean interior. Taken together, our results demonstrate that coupled Cd isotope and concentration data provide valuable insights into the distribution and biological cycling of Cd in the water column. The highly systematic nature of Cd isotope signatures may furthermore prove to be of utility for future research in marine geochemistry and paleoceanography. |
format |
Article in Journal/Newspaper |
author |
Xue, Z. Rehkämper, M. Horner, T.J. Abouchami, W. Middag, R. van de Flierd, T. de Baar, H.J.W. |
spellingShingle |
Xue, Z. Rehkämper, M. Horner, T.J. Abouchami, W. Middag, R. van de Flierd, T. de Baar, H.J.W. Cadmium isotope variations in the Southern Ocean |
author_facet |
Xue, Z. Rehkämper, M. Horner, T.J. Abouchami, W. Middag, R. van de Flierd, T. de Baar, H.J.W. |
author_sort |
Xue, Z. |
title |
Cadmium isotope variations in the Southern Ocean |
title_short |
Cadmium isotope variations in the Southern Ocean |
title_full |
Cadmium isotope variations in the Southern Ocean |
title_fullStr |
Cadmium isotope variations in the Southern Ocean |
title_full_unstemmed |
Cadmium isotope variations in the Southern Ocean |
title_sort |
cadmium isotope variations in the southern ocean |
publishDate |
2013 |
url |
http://imis.nioz.nl/imis.php?module=ref&refid=240540 |
geographic |
Antarctic Southern Ocean Weddell Sea Drake Passage Weddell |
geographic_facet |
Antarctic Southern Ocean Weddell Sea Drake Passage Weddell |
genre |
Antarc* Antarctic Drake Passage Southern Ocean Weddell Sea |
genre_facet |
Antarc* Antarctic Drake Passage Southern Ocean Weddell Sea |
op_source |
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op_relation |
info:eu-repo/semantics/altIdentifier/wos/000327229100018 info:eu-repo/semantics/altIdentifier/doi/oi.org/10.1016/j.epsl.2013.09.014 http://imis.nioz.nl/imis.php?module=ref&refid=240540 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1016/j.epsl.2013.09.014 |
container_title |
Earth and Planetary Science Letters |
container_volume |
382 |
container_start_page |
161 |
op_container_end_page |
172 |
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1766248041829892096 |