Winter Biogeochemical Cycling of Dissolved and Particulate Cadmium in the Indian Sector of the Southern Ocean (GEOTRACES GIpr07 Transect)
International audience Winter distributions of dissolved cadmium (dCd) and particulate cadmium (pCd) were measured for the first time in the Indian sector of the Southern Ocean thereby contributing a unique spatial and seasonal dataset. Seven depth profiles, between 41°S and 58°S, were collected alo...
Published in: | Frontiers in Marine Science |
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Main Authors: | , , , , , , |
Other Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2021
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Subjects: | |
Online Access: | https://hal.science/hal-03366004 https://hal.science/hal-03366004/document https://hal.science/hal-03366004/file/CRGEOS_2021__353_S1_A11_0.pdf https://doi.org/10.3389/fmars.2021.656321 |
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ftinsu:oai:HAL:hal-03366004v1 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDE]Environmental Sciences [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment |
spellingShingle |
[SDE]Environmental Sciences [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment Cloete, Ryan Loock, Jean van Horsten, Natasha Fietz, Susanne Mtshali, Thato Planquette, Hélène Roychoudhury, Alakendra Winter Biogeochemical Cycling of Dissolved and Particulate Cadmium in the Indian Sector of the Southern Ocean (GEOTRACES GIpr07 Transect) |
topic_facet |
[SDE]Environmental Sciences [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment |
description |
International audience Winter distributions of dissolved cadmium (dCd) and particulate cadmium (pCd) were measured for the first time in the Indian sector of the Southern Ocean thereby contributing a unique spatial and seasonal dataset. Seven depth profiles, between 41°S and 58°S, were collected along the 30°E longitude during the 2017 austral winter to investigate the biogeochemical cycling of cadmium during a period characterized by contrasting upper water column dynamics compared to summer. Our results support an important role for biological uptake during winter months albeit weaker compared to summer. Distinct, biologically driven changes in cadmium cycling across the transect were observed. For example, surface ratios of pCd to phosphorus (P; pCd:P) increased from 0.37 to 1.07 mmol mol –1 between the subtropical zone (STZ) and the Antarctic zone (AAZ) reflecting increased Cd requirements for diatoms at higher latitudes which, in turn, was driven by a complex relationship between the availability of dCd and dissolved iron (dFe), zinc (dZn) and manganese (dMn). Vertical profiles of pCd:P displayed near-surface maxima consistent with (1) P occurring in two phases with different labilities and the lability of Cd being somewhere in-between and (2) increasing dCd to phosphate (PO 4 dCd:PO 4 ) ratios with depth at each station. North of the Antarctic Polar Front (APF), a secondary, deeper pCd:P maximum may reflect an advective signal associated with northward subducting Antarctic Intermediate Water (AAIW). The strong southward increase in surface dCd and dCd:PO 4 , from approximately 10–700 pmol kg –1 and 40–400 μmol mol –1 , respectively, reflected the net effect of preferential uptake and regeneration of diatoms with high Cd content and the upwelling of Cd enriched water masses in the AAZ. Furthermore, distinct dCd versus PO 4 relationships were observed in each of the intermediate and deep water masses suggesting that dCd and PO 4 distributions at depth are largely the result of physical water mass mixing. |
author2 |
Council for Scientific and Industrial Research Cape Town (CSIR) Ministery of Science and Technology Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Cloete, Ryan Loock, Jean van Horsten, Natasha Fietz, Susanne Mtshali, Thato Planquette, Hélène Roychoudhury, Alakendra |
author_facet |
Cloete, Ryan Loock, Jean van Horsten, Natasha Fietz, Susanne Mtshali, Thato Planquette, Hélène Roychoudhury, Alakendra |
author_sort |
Cloete, Ryan |
title |
Winter Biogeochemical Cycling of Dissolved and Particulate Cadmium in the Indian Sector of the Southern Ocean (GEOTRACES GIpr07 Transect) |
title_short |
Winter Biogeochemical Cycling of Dissolved and Particulate Cadmium in the Indian Sector of the Southern Ocean (GEOTRACES GIpr07 Transect) |
title_full |
Winter Biogeochemical Cycling of Dissolved and Particulate Cadmium in the Indian Sector of the Southern Ocean (GEOTRACES GIpr07 Transect) |
title_fullStr |
Winter Biogeochemical Cycling of Dissolved and Particulate Cadmium in the Indian Sector of the Southern Ocean (GEOTRACES GIpr07 Transect) |
title_full_unstemmed |
Winter Biogeochemical Cycling of Dissolved and Particulate Cadmium in the Indian Sector of the Southern Ocean (GEOTRACES GIpr07 Transect) |
title_sort |
winter biogeochemical cycling of dissolved and particulate cadmium in the indian sector of the southern ocean (geotraces gipr07 transect) |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://hal.science/hal-03366004 https://hal.science/hal-03366004/document https://hal.science/hal-03366004/file/CRGEOS_2021__353_S1_A11_0.pdf https://doi.org/10.3389/fmars.2021.656321 |
geographic |
Antarctic Southern Ocean The Antarctic Austral Indian |
geographic_facet |
Antarctic Southern Ocean The Antarctic Austral Indian |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
ISSN: 2296-7745 Frontiers in Marine Science https://hal.science/hal-03366004 Frontiers in Marine Science, 2021, 8, ⟨10.3389/fmars.2021.656321⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.3389/fmars.2021.656321 hal-03366004 https://hal.science/hal-03366004 https://hal.science/hal-03366004/document https://hal.science/hal-03366004/file/CRGEOS_2021__353_S1_A11_0.pdf doi:10.3389/fmars.2021.656321 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.3389/fmars.2021.656321 |
container_title |
Frontiers in Marine Science |
container_volume |
8 |
_version_ |
1790602093879361536 |
spelling |
ftinsu:oai:HAL:hal-03366004v1 2024-02-11T09:56:18+01:00 Winter Biogeochemical Cycling of Dissolved and Particulate Cadmium in the Indian Sector of the Southern Ocean (GEOTRACES GIpr07 Transect) Cloete, Ryan Loock, Jean van Horsten, Natasha Fietz, Susanne Mtshali, Thato Planquette, Hélène Roychoudhury, Alakendra Council for Scientific and Industrial Research Cape Town (CSIR) Ministery of Science and Technology Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) 2021-07-26 https://hal.science/hal-03366004 https://hal.science/hal-03366004/document https://hal.science/hal-03366004/file/CRGEOS_2021__353_S1_A11_0.pdf https://doi.org/10.3389/fmars.2021.656321 en eng HAL CCSD Frontiers Media info:eu-repo/semantics/altIdentifier/doi/10.3389/fmars.2021.656321 hal-03366004 https://hal.science/hal-03366004 https://hal.science/hal-03366004/document https://hal.science/hal-03366004/file/CRGEOS_2021__353_S1_A11_0.pdf doi:10.3389/fmars.2021.656321 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 2296-7745 Frontiers in Marine Science https://hal.science/hal-03366004 Frontiers in Marine Science, 2021, 8, ⟨10.3389/fmars.2021.656321⟩ [SDE]Environmental Sciences [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment info:eu-repo/semantics/article Journal articles 2021 ftinsu https://doi.org/10.3389/fmars.2021.656321 2024-01-24T17:30:58Z International audience Winter distributions of dissolved cadmium (dCd) and particulate cadmium (pCd) were measured for the first time in the Indian sector of the Southern Ocean thereby contributing a unique spatial and seasonal dataset. Seven depth profiles, between 41°S and 58°S, were collected along the 30°E longitude during the 2017 austral winter to investigate the biogeochemical cycling of cadmium during a period characterized by contrasting upper water column dynamics compared to summer. Our results support an important role for biological uptake during winter months albeit weaker compared to summer. Distinct, biologically driven changes in cadmium cycling across the transect were observed. For example, surface ratios of pCd to phosphorus (P; pCd:P) increased from 0.37 to 1.07 mmol mol –1 between the subtropical zone (STZ) and the Antarctic zone (AAZ) reflecting increased Cd requirements for diatoms at higher latitudes which, in turn, was driven by a complex relationship between the availability of dCd and dissolved iron (dFe), zinc (dZn) and manganese (dMn). Vertical profiles of pCd:P displayed near-surface maxima consistent with (1) P occurring in two phases with different labilities and the lability of Cd being somewhere in-between and (2) increasing dCd to phosphate (PO 4 dCd:PO 4 ) ratios with depth at each station. North of the Antarctic Polar Front (APF), a secondary, deeper pCd:P maximum may reflect an advective signal associated with northward subducting Antarctic Intermediate Water (AAIW). The strong southward increase in surface dCd and dCd:PO 4 , from approximately 10–700 pmol kg –1 and 40–400 μmol mol –1 , respectively, reflected the net effect of preferential uptake and regeneration of diatoms with high Cd content and the upwelling of Cd enriched water masses in the AAZ. Furthermore, distinct dCd versus PO 4 relationships were observed in each of the intermediate and deep water masses suggesting that dCd and PO 4 distributions at depth are largely the result of physical water mass mixing. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean Institut national des sciences de l'Univers: HAL-INSU Antarctic Southern Ocean The Antarctic Austral Indian Frontiers in Marine Science 8 |