Winter dissolved and particulate zinc in the Indian Sector of the Southern Ocean: Distribution and relation to major nutrients (GEOTRACES GIpr07 transect)
First winter measurements of dissolved zinc (dZn) and particulate zinc (pZn) are presented from seven stations, between 41 and 58°S, occupied in July 2017 along the 30°E longitude in the Indian Sector of the Southern Ocean. This unique spatial and seasonal dataset provided the opportunity to investi...
Published in: | Marine Chemistry |
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Main Authors: | , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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2021
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Online Access: | http://hdl.handle.net/10204/12353 https://doi.org/10.1016/j.marchem.2021.104031 |
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ftcsir:oai:researchspace.csir.co.za:10204/12353 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Council for Scientific and Industrial Research (South Africa): CSIR Research Space |
op_collection_id |
ftcsir |
language |
English |
topic |
Diatoms Dissolved zinc Geotraces |
spellingShingle |
Diatoms Dissolved zinc Geotraces Cloete, R Loock, JC Van Horsten, Natasha R Menzel Barraqueta, J-L Fietz, S Mtshali, Thato N Planquette, H Garcia-Ibanez, MI Roychoudhurya, AN Winter dissolved and particulate zinc in the Indian Sector of the Southern Ocean: Distribution and relation to major nutrients (GEOTRACES GIpr07 transect) |
topic_facet |
Diatoms Dissolved zinc Geotraces |
description |
First winter measurements of dissolved zinc (dZn) and particulate zinc (pZn) are presented from seven stations, between 41 and 58°S, occupied in July 2017 along the 30°E longitude in the Indian Sector of the Southern Ocean. This unique spatial and seasonal dataset provided the opportunity to investigate Zn biogeochemical cycling in a region which is extremely data scarce and during a period when conditions are unfavourable for phytoplankton growth. Surface comparisons of our winter dZn and pZn to previous measurements during spring and summer revealed that Zn seasonality is most pronounced at the higher latitudes where higher dZn (and higher ratios of dZn to phosphate; dZn:PO4) and lower pZn in winter reflect decreased biological uptake and preferential dZn resupply (relative to PO4) to surface waters through deep winter mixing. The composition of pZn was majorly biogenic however localised lithogenic inputs were attributed to potential hydrothermal activity and transport of continental sediment via Agulhas waters. Calculated vertical attenuation factors (b values) for pZn (0.31) and phosphorus (P; 0.41) suggest that Zn has a longer remineralisation length scale than P, providing a mechanism as to why dZn appears to be remineralised deeper in the water column than PO4. Ratios of pZn to P (pZn:P) in surface waters increased with latitude from 1.12 to 8.28 mmol mol-1 due to increased dZn availability and the dominance of diatoms (with high cellular Zn quotas) in the high latitude Antarctic Zone (AAZ). Interestingly, the high surface pZn:P ratios in the AAZ did not change significantly with depth (in contrast to the northern stations where pZn:P increased with depth) suggesting the export of diatom cells below the winter mixed layer where remineralisation and rigorous mixing may resolve the linear dZn to silicic acid (dZn:Si(OH)4) correlation (dZn (nmol kg-1) = 0.064 Si(OH)4 (µmol kg-1) + 0.690; r2 = 0.93; n = 120) despite these elements being located in separate components of the diatom cell. Additionally, elevated ... |
format |
Article in Journal/Newspaper |
author |
Cloete, R Loock, JC Van Horsten, Natasha R Menzel Barraqueta, J-L Fietz, S Mtshali, Thato N Planquette, H Garcia-Ibanez, MI Roychoudhurya, AN |
author_facet |
Cloete, R Loock, JC Van Horsten, Natasha R Menzel Barraqueta, J-L Fietz, S Mtshali, Thato N Planquette, H Garcia-Ibanez, MI Roychoudhurya, AN |
author_sort |
Cloete, R |
title |
Winter dissolved and particulate zinc in the Indian Sector of the Southern Ocean: Distribution and relation to major nutrients (GEOTRACES GIpr07 transect) |
title_short |
Winter dissolved and particulate zinc in the Indian Sector of the Southern Ocean: Distribution and relation to major nutrients (GEOTRACES GIpr07 transect) |
title_full |
Winter dissolved and particulate zinc in the Indian Sector of the Southern Ocean: Distribution and relation to major nutrients (GEOTRACES GIpr07 transect) |
title_fullStr |
Winter dissolved and particulate zinc in the Indian Sector of the Southern Ocean: Distribution and relation to major nutrients (GEOTRACES GIpr07 transect) |
title_full_unstemmed |
Winter dissolved and particulate zinc in the Indian Sector of the Southern Ocean: Distribution and relation to major nutrients (GEOTRACES GIpr07 transect) |
title_sort |
winter dissolved and particulate zinc in the indian sector of the southern ocean: distribution and relation to major nutrients (geotraces gipr07 transect) |
publishDate |
2021 |
url |
http://hdl.handle.net/10204/12353 https://doi.org/10.1016/j.marchem.2021.104031 |
geographic |
Antarctic Indian Southern Ocean |
geographic_facet |
Antarctic Indian Southern Ocean |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
Marine Chemistry, 236 |
op_relation |
https://research-portal.uea.ac.uk/en/publications/winter-dissolved-and-particulate-zinc-in-the-indian-sector-of-the Cloete, R., Loock, J., Van Horsten, N.R., Menzel Barraqueta, J., Fietz, S., Mtshali, T., Planquette, H. & Garcia-Ibanez, M. et al. 2021. Winter dissolved and particulate zinc in the Indian Sector of the Southern Ocean: Distribution and relation to major nutrients (GEOTRACES GIpr07 transect). Marine Chemistry, 236. http://hdl.handle.net/10204/12353 0304-4203 1872-7581 https://doi.org/10.1016/j.marchem.2021.104031 http://hdl.handle.net/10204/12353 Cloete, R., Loock, J., Van Horsten, N. R., Menzel Barraqueta, J., Fietz, S., Mtshali, T., . Roychoudhurya, A. (2021). Winter dissolved and particulate zinc in the Indian Sector of the Southern Ocean: Distribution and relation to major nutrients (GEOTRACES GIpr07 transect). Marine Chemistry, 236 , http://hdl.handle.net/10204/12353 Cloete, R, JC Loock, Natasha R Van Horsten, J-L Menzel Barraqueta, S Fietz, TN Mtshali, H Planquette, MI Garcia-Ibanez, and AN Roychoudhurya "Winter dissolved and particulate zinc in the Indian Sector of the Southern Ocean: Distribution and relation to major nutrients (GEOTRACES GIpr07 transect)." Marine Chemistry, 236 (2021) http://hdl.handle.net/10204/12353 Cloete R, Loock J, Van Horsten NR, Menzel Barraqueta J, Fietz S, Mtshali T, et al. Winter dissolved and particulate zinc in the Indian Sector of the Southern Ocean: Distribution and relation to major nutrients (GEOTRACES GIpr07 transect). Marine Chemistry, 236. 2021; http://hdl.handle.net/10204/12353. 25424 25495 |
op_doi |
https://doi.org/10.1016/j.marchem.2021.104031 |
container_title |
Marine Chemistry |
container_volume |
236 |
container_start_page |
104031 |
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1768377391862775808 |
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ftcsir:oai:researchspace.csir.co.za:10204/12353 2023-06-11T04:05:46+02:00 Winter dissolved and particulate zinc in the Indian Sector of the Southern Ocean: Distribution and relation to major nutrients (GEOTRACES GIpr07 transect) Cloete, R Loock, JC Van Horsten, Natasha R Menzel Barraqueta, J-L Fietz, S Mtshali, Thato N Planquette, H Garcia-Ibanez, MI Roychoudhurya, AN 2021-11 Abstract application/pdf http://hdl.handle.net/10204/12353 https://doi.org/10.1016/j.marchem.2021.104031 en eng https://research-portal.uea.ac.uk/en/publications/winter-dissolved-and-particulate-zinc-in-the-indian-sector-of-the Cloete, R., Loock, J., Van Horsten, N.R., Menzel Barraqueta, J., Fietz, S., Mtshali, T., Planquette, H. & Garcia-Ibanez, M. et al. 2021. Winter dissolved and particulate zinc in the Indian Sector of the Southern Ocean: Distribution and relation to major nutrients (GEOTRACES GIpr07 transect). Marine Chemistry, 236. http://hdl.handle.net/10204/12353 0304-4203 1872-7581 https://doi.org/10.1016/j.marchem.2021.104031 http://hdl.handle.net/10204/12353 Cloete, R., Loock, J., Van Horsten, N. R., Menzel Barraqueta, J., Fietz, S., Mtshali, T., . Roychoudhurya, A. (2021). Winter dissolved and particulate zinc in the Indian Sector of the Southern Ocean: Distribution and relation to major nutrients (GEOTRACES GIpr07 transect). Marine Chemistry, 236 , http://hdl.handle.net/10204/12353 Cloete, R, JC Loock, Natasha R Van Horsten, J-L Menzel Barraqueta, S Fietz, TN Mtshali, H Planquette, MI Garcia-Ibanez, and AN Roychoudhurya "Winter dissolved and particulate zinc in the Indian Sector of the Southern Ocean: Distribution and relation to major nutrients (GEOTRACES GIpr07 transect)." Marine Chemistry, 236 (2021) http://hdl.handle.net/10204/12353 Cloete R, Loock J, Van Horsten NR, Menzel Barraqueta J, Fietz S, Mtshali T, et al. Winter dissolved and particulate zinc in the Indian Sector of the Southern Ocean: Distribution and relation to major nutrients (GEOTRACES GIpr07 transect). Marine Chemistry, 236. 2021; http://hdl.handle.net/10204/12353. 25424 25495 Marine Chemistry, 236 Diatoms Dissolved zinc Geotraces Article 2021 ftcsir https://doi.org/10.1016/j.marchem.2021.104031 2023-05-09T23:47:43Z First winter measurements of dissolved zinc (dZn) and particulate zinc (pZn) are presented from seven stations, between 41 and 58°S, occupied in July 2017 along the 30°E longitude in the Indian Sector of the Southern Ocean. This unique spatial and seasonal dataset provided the opportunity to investigate Zn biogeochemical cycling in a region which is extremely data scarce and during a period when conditions are unfavourable for phytoplankton growth. Surface comparisons of our winter dZn and pZn to previous measurements during spring and summer revealed that Zn seasonality is most pronounced at the higher latitudes where higher dZn (and higher ratios of dZn to phosphate; dZn:PO4) and lower pZn in winter reflect decreased biological uptake and preferential dZn resupply (relative to PO4) to surface waters through deep winter mixing. The composition of pZn was majorly biogenic however localised lithogenic inputs were attributed to potential hydrothermal activity and transport of continental sediment via Agulhas waters. Calculated vertical attenuation factors (b values) for pZn (0.31) and phosphorus (P; 0.41) suggest that Zn has a longer remineralisation length scale than P, providing a mechanism as to why dZn appears to be remineralised deeper in the water column than PO4. Ratios of pZn to P (pZn:P) in surface waters increased with latitude from 1.12 to 8.28 mmol mol-1 due to increased dZn availability and the dominance of diatoms (with high cellular Zn quotas) in the high latitude Antarctic Zone (AAZ). Interestingly, the high surface pZn:P ratios in the AAZ did not change significantly with depth (in contrast to the northern stations where pZn:P increased with depth) suggesting the export of diatom cells below the winter mixed layer where remineralisation and rigorous mixing may resolve the linear dZn to silicic acid (dZn:Si(OH)4) correlation (dZn (nmol kg-1) = 0.064 Si(OH)4 (µmol kg-1) + 0.690; r2 = 0.93; n = 120) despite these elements being located in separate components of the diatom cell. Additionally, elevated ... Article in Journal/Newspaper Antarc* Antarctic Southern Ocean Council for Scientific and Industrial Research (South Africa): CSIR Research Space Antarctic Indian Southern Ocean Marine Chemistry 236 104031 |