Copper speciation and distribution in the Atlantic sector of the Southern Ocean
The distribution and speciation of dissolved copper (Cu) was investigated in the Atlantic sector of the Southern Ocean in austral autumn of 2008 as part of the IPY GEOTRACES expedition ZERO & DRAKE. Distribution measurements focused on two transects across the major frontal systems along the Zer...
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ftoceanrep:oai:oceanrep.geomar.de:28264 2023-05-15T13:37:05+02:00 Copper speciation and distribution in the Atlantic sector of the Southern Ocean Heller, Maija Croot, Peter 2015-07-20 text https://oceanrep.geomar.de/id/eprint/28264/ https://oceanrep.geomar.de/id/eprint/28264/1/1-s2.0-S0304420314001686-main-1.pdf https://doi.org/10.1016/j.marchem.2014.09.017 en eng Elsevier https://oceanrep.geomar.de/id/eprint/28264/1/1-s2.0-S0304420314001686-main-1.pdf Heller, M. and Croot, P. (2015) Copper speciation and distribution in the Atlantic sector of the Southern Ocean. Marine Chemistry, 173 . pp. 253-268. DOI 10.1016/j.marchem.2014.09.017 <https://doi.org/10.1016/j.marchem.2014.09.017>. doi:10.1016/j.marchem.2014.09.017 info:eu-repo/semantics/restrictedAccess Article PeerReviewed 2015 ftoceanrep https://doi.org/10.1016/j.marchem.2014.09.017 2023-04-07T15:18:33Z The distribution and speciation of dissolved copper (Cu) was investigated in the Atlantic sector of the Southern Ocean in austral autumn of 2008 as part of the IPY GEOTRACES expedition ZERO & DRAKE. Distribution measurements focused on two transects across the major frontal systems along the Zero Meridian and across the Drake Passage whereas speciation work was investigated in the Drake Passage and the ice covered Weddell Sea. Along the two transects the dissolved Cu concentration exhibited a gradient in the surface with Cu values increasing poleward. Vertical profiles of Cu showed in general monotonic increases with depth, which correlated slightly with silicate but poorly with phosphate. Benthic sources of Cu were observed along the Zero Meridian transect and close to the Antarctic Peninsula for the Drake Passage. Dissolved Cu (DCu) appears to be removed from surface waters through adsorption/complexation by particulate matter. Speciation measurements on DCu indicated a relatively uniform distribution of 25-50nM of L2 (log K ~11.8) class ligands. No L1 class ligands (log K >13) were detected in any of the samples examined. Estimates of free Cu (pCu=13.5 to 12.5) showed only small variations in the upper water column and was generally uniform in deep waters. These findings indicate that there is insufficient free copper to account for the rapid reactivity of superoxide (O2 -) with Cu in these waters (Heller and Croot, 2010c) suggesting that the organic Cu complexes present in seawater can undergo rapid redox reactions. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Drake Passage IPY Southern Ocean Weddell Sea OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Antarctic Antarctic Peninsula Austral Drake Passage Southern Ocean The Antarctic Weddell Weddell Sea Marine Chemistry 173 253 268 |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
language |
English |
description |
The distribution and speciation of dissolved copper (Cu) was investigated in the Atlantic sector of the Southern Ocean in austral autumn of 2008 as part of the IPY GEOTRACES expedition ZERO & DRAKE. Distribution measurements focused on two transects across the major frontal systems along the Zero Meridian and across the Drake Passage whereas speciation work was investigated in the Drake Passage and the ice covered Weddell Sea. Along the two transects the dissolved Cu concentration exhibited a gradient in the surface with Cu values increasing poleward. Vertical profiles of Cu showed in general monotonic increases with depth, which correlated slightly with silicate but poorly with phosphate. Benthic sources of Cu were observed along the Zero Meridian transect and close to the Antarctic Peninsula for the Drake Passage. Dissolved Cu (DCu) appears to be removed from surface waters through adsorption/complexation by particulate matter. Speciation measurements on DCu indicated a relatively uniform distribution of 25-50nM of L2 (log K ~11.8) class ligands. No L1 class ligands (log K >13) were detected in any of the samples examined. Estimates of free Cu (pCu=13.5 to 12.5) showed only small variations in the upper water column and was generally uniform in deep waters. These findings indicate that there is insufficient free copper to account for the rapid reactivity of superoxide (O2 -) with Cu in these waters (Heller and Croot, 2010c) suggesting that the organic Cu complexes present in seawater can undergo rapid redox reactions. |
format |
Article in Journal/Newspaper |
author |
Heller, Maija Croot, Peter |
spellingShingle |
Heller, Maija Croot, Peter Copper speciation and distribution in the Atlantic sector of the Southern Ocean |
author_facet |
Heller, Maija Croot, Peter |
author_sort |
Heller, Maija |
title |
Copper speciation and distribution in the Atlantic sector of the Southern Ocean |
title_short |
Copper speciation and distribution in the Atlantic sector of the Southern Ocean |
title_full |
Copper speciation and distribution in the Atlantic sector of the Southern Ocean |
title_fullStr |
Copper speciation and distribution in the Atlantic sector of the Southern Ocean |
title_full_unstemmed |
Copper speciation and distribution in the Atlantic sector of the Southern Ocean |
title_sort |
copper speciation and distribution in the atlantic sector of the southern ocean |
publisher |
Elsevier |
publishDate |
2015 |
url |
https://oceanrep.geomar.de/id/eprint/28264/ https://oceanrep.geomar.de/id/eprint/28264/1/1-s2.0-S0304420314001686-main-1.pdf https://doi.org/10.1016/j.marchem.2014.09.017 |
geographic |
Antarctic Antarctic Peninsula Austral Drake Passage Southern Ocean The Antarctic Weddell Weddell Sea |
geographic_facet |
Antarctic Antarctic Peninsula Austral Drake Passage Southern Ocean The Antarctic Weddell Weddell Sea |
genre |
Antarc* Antarctic Antarctic Peninsula Drake Passage IPY Southern Ocean Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Drake Passage IPY Southern Ocean Weddell Sea |
op_relation |
https://oceanrep.geomar.de/id/eprint/28264/1/1-s2.0-S0304420314001686-main-1.pdf Heller, M. and Croot, P. (2015) Copper speciation and distribution in the Atlantic sector of the Southern Ocean. Marine Chemistry, 173 . pp. 253-268. DOI 10.1016/j.marchem.2014.09.017 <https://doi.org/10.1016/j.marchem.2014.09.017>. doi:10.1016/j.marchem.2014.09.017 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.marchem.2014.09.017 |
container_title |
Marine Chemistry |
container_volume |
173 |
container_start_page |
253 |
op_container_end_page |
268 |
_version_ |
1766087938370699264 |