Mercury and methylmercury in the Atlantic sector of the Southern Ocean
Oceans constitute one of the most important reservoirs for mercury. In order to provide a first insight into the concentrations of Hg species in the Atlantic sector of the Southern Ocean a sampling campaign was carried out south of the Polar Front. Water samples taken at discrete depths from the sur...
Published in: | Deep Sea Research Part II: Topical Studies in Oceanography |
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Online Access: | http://hdl.handle.net/10508/11219 http://hdl.handle.net/10261/321054 https://doi.org/10.1016/j.dsr2.2016.07.012 |
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ftcsic:oai:digital.csic.es:10261/321054 2024-02-11T10:08:50+01:00 Mercury and methylmercury in the Atlantic sector of the Southern Ocean Canario, Joao Santos-Echeandía, Juan Padeiro, Ana Amaro, Eduardo Strass, V.H. Klaas, Christine Hoppema, Mario Ossebaar, Sharyn Koch, Boris P. Laglera, Luis M. 2017-04 http://hdl.handle.net/10508/11219 http://hdl.handle.net/10261/321054 https://doi.org/10.1016/j.dsr2.2016.07.012 en eng Centro Oceanográfico de Murcia AM Deep Sea Research Part II: Topical Studies in Oceanography, 138. 2017: 52-62 0967-0645 http://hdl.handle.net/10508/11219 http://hdl.handle.net/10261/321054 https://doi.org/10.1016/j.dsr2.2016.07.012 open Centro Oceanográfico de Murcia Medio Marino water masses fish particulate organic carbon organic carbon carbon research article 2017 ftcsic https://doi.org/10.1016/j.dsr2.2016.07.012 2024-01-16T11:46:18Z Oceans constitute one of the most important reservoirs for mercury. In order to provide a first insight into the concentrations of Hg species in the Atlantic sector of the Southern Ocean a sampling campaign was carried out south of the Polar Front. Water samples taken at discrete depths from the surface down to 300 m at six stations were analysed for total Hg (HgT), methylmercury (MeHg) and other interpretative parameters such as salinity, temperature, dissolved and particulate organic carbon, dissolved oxygen, chlorophyll and inorganic nutrients. Results showed a high spatial variability in the concentrations of HgT and MeHg. HgT (0.93±0.69 ng L−1) and MeHg (0.26±0.12 ng L−1) levels were similar or higher than those reported in previous works in high latitude studies. The highest values were found at a location (−53°, 10°E) south of the South Polar Front, an area of strong gradients caused by the mixing of different water masses. Vertical profiles showed a great variability even for those stations sampled at the same location or an area dominated by the same oceanographic features. A decrease of HgT and a consequent increase in MeHg with depth was observed in some sites, suggesting the occurrence of Hg-methylation process, while at other stations, a concurrent decrease or increase of both mercury species was observed. In spite of these differences, an overall positive correlation between HgT and MeHg was observed. Differences between vertical profiles of Hg species were attributed to favourable environmental conditions for Hg methylation. The highest proportion of MeHg (% of HgT) was observed in sites with low dissolved oxygen or highest estimated remineralization rates. The results obtained in this study show that the Hg distribution and speciation in the Atlantic sector of the SO is comparable (or in some sites higher) to the ones published for the other open ocean regions. However, the concentrations of MeHg in this area are more dependent on the environmental conditions than on the total concentration of Hg ... Article in Journal/Newspaper Southern Ocean Digital.CSIC (Spanish National Research Council) Southern Ocean Deep Sea Research Part II: Topical Studies in Oceanography 138 52 62 |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
topic |
Centro Oceanográfico de Murcia Medio Marino water masses fish particulate organic carbon organic carbon carbon |
spellingShingle |
Centro Oceanográfico de Murcia Medio Marino water masses fish particulate organic carbon organic carbon carbon Canario, Joao Santos-Echeandía, Juan Padeiro, Ana Amaro, Eduardo Strass, V.H. Klaas, Christine Hoppema, Mario Ossebaar, Sharyn Koch, Boris P. Laglera, Luis M. Mercury and methylmercury in the Atlantic sector of the Southern Ocean |
topic_facet |
Centro Oceanográfico de Murcia Medio Marino water masses fish particulate organic carbon organic carbon carbon |
description |
Oceans constitute one of the most important reservoirs for mercury. In order to provide a first insight into the concentrations of Hg species in the Atlantic sector of the Southern Ocean a sampling campaign was carried out south of the Polar Front. Water samples taken at discrete depths from the surface down to 300 m at six stations were analysed for total Hg (HgT), methylmercury (MeHg) and other interpretative parameters such as salinity, temperature, dissolved and particulate organic carbon, dissolved oxygen, chlorophyll and inorganic nutrients. Results showed a high spatial variability in the concentrations of HgT and MeHg. HgT (0.93±0.69 ng L−1) and MeHg (0.26±0.12 ng L−1) levels were similar or higher than those reported in previous works in high latitude studies. The highest values were found at a location (−53°, 10°E) south of the South Polar Front, an area of strong gradients caused by the mixing of different water masses. Vertical profiles showed a great variability even for those stations sampled at the same location or an area dominated by the same oceanographic features. A decrease of HgT and a consequent increase in MeHg with depth was observed in some sites, suggesting the occurrence of Hg-methylation process, while at other stations, a concurrent decrease or increase of both mercury species was observed. In spite of these differences, an overall positive correlation between HgT and MeHg was observed. Differences between vertical profiles of Hg species were attributed to favourable environmental conditions for Hg methylation. The highest proportion of MeHg (% of HgT) was observed in sites with low dissolved oxygen or highest estimated remineralization rates. The results obtained in this study show that the Hg distribution and speciation in the Atlantic sector of the SO is comparable (or in some sites higher) to the ones published for the other open ocean regions. However, the concentrations of MeHg in this area are more dependent on the environmental conditions than on the total concentration of Hg ... |
format |
Article in Journal/Newspaper |
author |
Canario, Joao Santos-Echeandía, Juan Padeiro, Ana Amaro, Eduardo Strass, V.H. Klaas, Christine Hoppema, Mario Ossebaar, Sharyn Koch, Boris P. Laglera, Luis M. |
author_facet |
Canario, Joao Santos-Echeandía, Juan Padeiro, Ana Amaro, Eduardo Strass, V.H. Klaas, Christine Hoppema, Mario Ossebaar, Sharyn Koch, Boris P. Laglera, Luis M. |
author_sort |
Canario, Joao |
title |
Mercury and methylmercury in the Atlantic sector of the Southern Ocean |
title_short |
Mercury and methylmercury in the Atlantic sector of the Southern Ocean |
title_full |
Mercury and methylmercury in the Atlantic sector of the Southern Ocean |
title_fullStr |
Mercury and methylmercury in the Atlantic sector of the Southern Ocean |
title_full_unstemmed |
Mercury and methylmercury in the Atlantic sector of the Southern Ocean |
title_sort |
mercury and methylmercury in the atlantic sector of the southern ocean |
publishDate |
2017 |
url |
http://hdl.handle.net/10508/11219 http://hdl.handle.net/10261/321054 https://doi.org/10.1016/j.dsr2.2016.07.012 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
Centro Oceanográfico de Murcia AM Deep Sea Research Part II: Topical Studies in Oceanography, 138. 2017: 52-62 0967-0645 http://hdl.handle.net/10508/11219 http://hdl.handle.net/10261/321054 https://doi.org/10.1016/j.dsr2.2016.07.012 |
op_rights |
open |
op_doi |
https://doi.org/10.1016/j.dsr2.2016.07.012 |
container_title |
Deep Sea Research Part II: Topical Studies in Oceanography |
container_volume |
138 |
container_start_page |
52 |
op_container_end_page |
62 |
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1790608461777600512 |