Controls on distributions of aluminium, manganese and cobalt in the South Atlantic Ocean along GEOTRACES transect GA10
Trace metals (TMs) manganese (Mn), cobalt (Co), and aluminium (Al) have important geochemical and biological roles in the ocean. Here, we present full depth profiles of dissolved (d) and particulate Al, Mn, and Co along the latitude of 40 °S in the South Atlantic Ocean from the GEOTRACES GA10 cruise...
Published in: | Geochimica et Cosmochimica Acta |
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Language: | English |
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Elsevier
2024
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Online Access: | https://oceanrep.geomar.de/id/eprint/60181/ https://oceanrep.geomar.de/id/eprint/60181/2/1-s2.0-S0016703724001443-mmc1.pdf https://oceanrep.geomar.de/id/eprint/60181/13/1-s2.0-S0016703724001443-main.pdf https://doi.org/10.1016/j.gca.2024.03.019 |
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ftoceanrep:oai:oceanrep.geomar.de:60181 2024-05-12T07:55:59+00:00 Controls on distributions of aluminium, manganese and cobalt in the South Atlantic Ocean along GEOTRACES transect GA10 Chen, Xue-Gang Milne, Angela Klar, Jessica K. Gledhill, Martha Lohan, Maeve C. Hsieh, Yu-Te Henderson, Gideon M. Woodward, E. Malcolm S. Achterberg, Eric P. 2024-05-15 text https://oceanrep.geomar.de/id/eprint/60181/ https://oceanrep.geomar.de/id/eprint/60181/2/1-s2.0-S0016703724001443-mmc1.pdf https://oceanrep.geomar.de/id/eprint/60181/13/1-s2.0-S0016703724001443-main.pdf https://doi.org/10.1016/j.gca.2024.03.019 en eng Elsevier https://oceanrep.geomar.de/id/eprint/60181/2/1-s2.0-S0016703724001443-mmc1.pdf https://oceanrep.geomar.de/id/eprint/60181/13/1-s2.0-S0016703724001443-main.pdf Chen, X. G., Milne, A., Klar, J. K., Gledhill, M. , Lohan, M. C., Hsieh, Y. T., Henderson, G. M., Woodward, E. M. S. and Achterberg, E. P. (2024) Controls on distributions of aluminium, manganese and cobalt in the South Atlantic Ocean along GEOTRACES transect GA10. Open Access Geochimica et Cosmochimica Acta, 373 . pp. 177-196. DOI 10.1016/j.gca.2024.03.019 <https://doi.org/10.1016/j.gca.2024.03.019>. doi:10.1016/j.gca.2024.03.019 cc_by_4.0 info:eu-repo/semantics/openAccess Article PeerReviewed 2024 ftoceanrep https://doi.org/10.1016/j.gca.2024.03.019 2024-04-17T14:28:26Z Trace metals (TMs) manganese (Mn), cobalt (Co), and aluminium (Al) have important geochemical and biological roles in the ocean. Here, we present full depth profiles of dissolved (d) and particulate Al, Mn, and Co along the latitude of 40 °S in the South Atlantic Ocean from the GEOTRACES GA10 cruises that operated in austral spring 2010 and summer 2011. The region is characterized by enhanced primary productivity and forms a key transition zone between the Southern Ocean and South Atlantic Subtropical Gyre. The mean concentrations of dAl, dCo, and dMn (±standard deviation) were 3.36 ± 2.65 nmol kg−1, 35.3 ± 17.6 pmol kg−1, and 0.624 ± 1.08 nmol kg−1, respectively. Their distributions in surface waters were determined by external sources and complex internal biogeochemical processes. Specifically, surface ocean dCo was controlled by the interplay between phytoplankton uptake, remineralization and external inputs; dMn was likely determined by the formation and photoreduction of Mn-oxides; and dAl was supplied by atmospheric deposition and removed by scavenging onto particles. Fluvial and sedimentary inputs near the Rio de La Plata estuary and benthic sources from the Agulhas Bank resulted in elevated dTM concentrations in near-shore surface waters. These externally sourced dTMs were effectively delivered to the open ocean by offshore diffusion and/or advection, and potentially facilitated enhanced primary productivity along the transect. The distributions of dTMs at depth were predominantly controlled by the mixing of North Atlantic Deep Water (NADW) and waters of Antarctic origin (e.g., Upper Circumpolar Water (UCDW) and Antarctic Bottom Water (AABW)). The calculated endmember concentrations of dAl and dCo in NADW showed minor decreases in the SASTG following north–south transport, suggesting removal rates of 0.064 nM/year and 0.035–0.075 pM/year, respectively. The endmember concentration of dCo in AABW was maintained at ∼30 pmol kg−1 without evidence for scavenging removal in the Southern Ocean and SASTG (time ... Article in Journal/Newspaper Antarc* Antarctic NADW North Atlantic Deep Water North Atlantic South Atlantic Ocean Southern Ocean OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Antarctic Austral Southern Ocean Geochimica et Cosmochimica Acta 373 177 196 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
Trace metals (TMs) manganese (Mn), cobalt (Co), and aluminium (Al) have important geochemical and biological roles in the ocean. Here, we present full depth profiles of dissolved (d) and particulate Al, Mn, and Co along the latitude of 40 °S in the South Atlantic Ocean from the GEOTRACES GA10 cruises that operated in austral spring 2010 and summer 2011. The region is characterized by enhanced primary productivity and forms a key transition zone between the Southern Ocean and South Atlantic Subtropical Gyre. The mean concentrations of dAl, dCo, and dMn (±standard deviation) were 3.36 ± 2.65 nmol kg−1, 35.3 ± 17.6 pmol kg−1, and 0.624 ± 1.08 nmol kg−1, respectively. Their distributions in surface waters were determined by external sources and complex internal biogeochemical processes. Specifically, surface ocean dCo was controlled by the interplay between phytoplankton uptake, remineralization and external inputs; dMn was likely determined by the formation and photoreduction of Mn-oxides; and dAl was supplied by atmospheric deposition and removed by scavenging onto particles. Fluvial and sedimentary inputs near the Rio de La Plata estuary and benthic sources from the Agulhas Bank resulted in elevated dTM concentrations in near-shore surface waters. These externally sourced dTMs were effectively delivered to the open ocean by offshore diffusion and/or advection, and potentially facilitated enhanced primary productivity along the transect. The distributions of dTMs at depth were predominantly controlled by the mixing of North Atlantic Deep Water (NADW) and waters of Antarctic origin (e.g., Upper Circumpolar Water (UCDW) and Antarctic Bottom Water (AABW)). The calculated endmember concentrations of dAl and dCo in NADW showed minor decreases in the SASTG following north–south transport, suggesting removal rates of 0.064 nM/year and 0.035–0.075 pM/year, respectively. The endmember concentration of dCo in AABW was maintained at ∼30 pmol kg−1 without evidence for scavenging removal in the Southern Ocean and SASTG (time ... |
format |
Article in Journal/Newspaper |
author |
Chen, Xue-Gang Milne, Angela Klar, Jessica K. Gledhill, Martha Lohan, Maeve C. Hsieh, Yu-Te Henderson, Gideon M. Woodward, E. Malcolm S. Achterberg, Eric P. |
spellingShingle |
Chen, Xue-Gang Milne, Angela Klar, Jessica K. Gledhill, Martha Lohan, Maeve C. Hsieh, Yu-Te Henderson, Gideon M. Woodward, E. Malcolm S. Achterberg, Eric P. Controls on distributions of aluminium, manganese and cobalt in the South Atlantic Ocean along GEOTRACES transect GA10 |
author_facet |
Chen, Xue-Gang Milne, Angela Klar, Jessica K. Gledhill, Martha Lohan, Maeve C. Hsieh, Yu-Te Henderson, Gideon M. Woodward, E. Malcolm S. Achterberg, Eric P. |
author_sort |
Chen, Xue-Gang |
title |
Controls on distributions of aluminium, manganese and cobalt in the South Atlantic Ocean along GEOTRACES transect GA10 |
title_short |
Controls on distributions of aluminium, manganese and cobalt in the South Atlantic Ocean along GEOTRACES transect GA10 |
title_full |
Controls on distributions of aluminium, manganese and cobalt in the South Atlantic Ocean along GEOTRACES transect GA10 |
title_fullStr |
Controls on distributions of aluminium, manganese and cobalt in the South Atlantic Ocean along GEOTRACES transect GA10 |
title_full_unstemmed |
Controls on distributions of aluminium, manganese and cobalt in the South Atlantic Ocean along GEOTRACES transect GA10 |
title_sort |
controls on distributions of aluminium, manganese and cobalt in the south atlantic ocean along geotraces transect ga10 |
publisher |
Elsevier |
publishDate |
2024 |
url |
https://oceanrep.geomar.de/id/eprint/60181/ https://oceanrep.geomar.de/id/eprint/60181/2/1-s2.0-S0016703724001443-mmc1.pdf https://oceanrep.geomar.de/id/eprint/60181/13/1-s2.0-S0016703724001443-main.pdf https://doi.org/10.1016/j.gca.2024.03.019 |
geographic |
Antarctic Austral Southern Ocean |
geographic_facet |
Antarctic Austral Southern Ocean |
genre |
Antarc* Antarctic NADW North Atlantic Deep Water North Atlantic South Atlantic Ocean Southern Ocean |
genre_facet |
Antarc* Antarctic NADW North Atlantic Deep Water North Atlantic South Atlantic Ocean Southern Ocean |
op_relation |
https://oceanrep.geomar.de/id/eprint/60181/2/1-s2.0-S0016703724001443-mmc1.pdf https://oceanrep.geomar.de/id/eprint/60181/13/1-s2.0-S0016703724001443-main.pdf Chen, X. G., Milne, A., Klar, J. K., Gledhill, M. , Lohan, M. C., Hsieh, Y. T., Henderson, G. M., Woodward, E. M. S. and Achterberg, E. P. (2024) Controls on distributions of aluminium, manganese and cobalt in the South Atlantic Ocean along GEOTRACES transect GA10. Open Access Geochimica et Cosmochimica Acta, 373 . pp. 177-196. DOI 10.1016/j.gca.2024.03.019 <https://doi.org/10.1016/j.gca.2024.03.019>. doi:10.1016/j.gca.2024.03.019 |
op_rights |
cc_by_4.0 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.gca.2024.03.019 |
container_title |
Geochimica et Cosmochimica Acta |
container_volume |
373 |
container_start_page |
177 |
op_container_end_page |
196 |
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1798835873602600960 |