Distribution of barium in the Weddell Gyre: Impact of circulation and biogeochemical processes
The Southern Ocean data base of dissolved barium (Bad) has been augmented with two densely sampled sections across the Weddell Gyre sampled by the icebreaker FS Polarstern during February and March 2005.Bad was found to be relatively high in the surface layer as compared to the adjacent waters north...
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ftawi:oai:epic.awi.de:21789 2024-09-15T17:41:10+00:00 Distribution of barium in the Weddell Gyre: Impact of circulation and biogeochemical processes Hoppema, Mario Dehairs, F. Navez, J. Monnin, C. Jeandel, C. Fahrbach, Eberhard De Baar, H. J. W. 2010 https://epic.awi.de/id/eprint/21789/ https://doi.org/10.1016/j.marchem.2010.07.005 https://hdl.handle.net/10013/epic.36178 unknown Hoppema, M. orcid:0000-0002-2326-619X , Dehairs, F. , Navez, J. , Monnin, C. , Jeandel, C. , Fahrbach, E. and De Baar, H. J. W. (2010) Distribution of barium in the Weddell Gyre: Impact of circulation and biogeochemical processes , Marine Chemistry 122, pp. 118-129 . doi:10.1016/j.marchem.2010.07.005 <https://doi.org/10.1016/j.marchem.2010.07.005> , hdl:10013/epic.36178 EPIC3Marine Chemistry 122, pp. 118-129 Article isiRev 2010 ftawi https://doi.org/10.1016/j.marchem.2010.07.005 2024-06-24T04:01:54Z The Southern Ocean data base of dissolved barium (Bad) has been augmented with two densely sampled sections across the Weddell Gyre sampled by the icebreaker FS Polarstern during February and March 2005.Bad was found to be relatively high in the surface layer as compared to the adjacent waters north (Antarctic Circumpolar Current) and east (Antarctic Zone of the Indian sector). Compared to the inflowing water into the Weddell Gyre and also to the surface water, the deep water is characterized by a significant Bad enrichment. Depletion of Bad in the surface layer is associated with well-known biogeochemical processes, but we speculate that also sea-ice formation leads to the extraction of Ba from solution via barite (BaSO4) precipitation. The particulate Ba settles down the water column and redissolves in deeper water where undersaturation of barite is prevalent. In the bottom layer, enrichment of Bad occurs, exhibited as a Bad maximum, which is caused by Ba efflux from the sediments. In recently formed Weddell Sea Bottom Water, though, a Bad minimum is observed, imposed by the shelf water component of bottom water, which hasrelatively low Bad concentration. Like in other Southern Ocean regions, throughout the water column a strong correlation exists between Bad and dissolved silicate, although the relationship is different from thatin the Antarctic regions to the east. In a tentative budget, the deep water is found to be supplied with Bad mainly by the surface layer, but also to some extent by the bottom layer. Weddell Sea Deep Water, enriched in Bad, is transferred out of the Weddell Gyre into the ACC as Antarctic Bottom Water, making the gyre a source of Bad to the deep and abyssal world oceans. Article in Journal/Newspaper Antarc* Antarctic Sea ice Southern Ocean Weddell Sea Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Marine Chemistry 122 1-4 118 129 |
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Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
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unknown |
description |
The Southern Ocean data base of dissolved barium (Bad) has been augmented with two densely sampled sections across the Weddell Gyre sampled by the icebreaker FS Polarstern during February and March 2005.Bad was found to be relatively high in the surface layer as compared to the adjacent waters north (Antarctic Circumpolar Current) and east (Antarctic Zone of the Indian sector). Compared to the inflowing water into the Weddell Gyre and also to the surface water, the deep water is characterized by a significant Bad enrichment. Depletion of Bad in the surface layer is associated with well-known biogeochemical processes, but we speculate that also sea-ice formation leads to the extraction of Ba from solution via barite (BaSO4) precipitation. The particulate Ba settles down the water column and redissolves in deeper water where undersaturation of barite is prevalent. In the bottom layer, enrichment of Bad occurs, exhibited as a Bad maximum, which is caused by Ba efflux from the sediments. In recently formed Weddell Sea Bottom Water, though, a Bad minimum is observed, imposed by the shelf water component of bottom water, which hasrelatively low Bad concentration. Like in other Southern Ocean regions, throughout the water column a strong correlation exists between Bad and dissolved silicate, although the relationship is different from thatin the Antarctic regions to the east. In a tentative budget, the deep water is found to be supplied with Bad mainly by the surface layer, but also to some extent by the bottom layer. Weddell Sea Deep Water, enriched in Bad, is transferred out of the Weddell Gyre into the ACC as Antarctic Bottom Water, making the gyre a source of Bad to the deep and abyssal world oceans. |
format |
Article in Journal/Newspaper |
author |
Hoppema, Mario Dehairs, F. Navez, J. Monnin, C. Jeandel, C. Fahrbach, Eberhard De Baar, H. J. W. |
spellingShingle |
Hoppema, Mario Dehairs, F. Navez, J. Monnin, C. Jeandel, C. Fahrbach, Eberhard De Baar, H. J. W. Distribution of barium in the Weddell Gyre: Impact of circulation and biogeochemical processes |
author_facet |
Hoppema, Mario Dehairs, F. Navez, J. Monnin, C. Jeandel, C. Fahrbach, Eberhard De Baar, H. J. W. |
author_sort |
Hoppema, Mario |
title |
Distribution of barium in the Weddell Gyre: Impact of circulation and biogeochemical processes |
title_short |
Distribution of barium in the Weddell Gyre: Impact of circulation and biogeochemical processes |
title_full |
Distribution of barium in the Weddell Gyre: Impact of circulation and biogeochemical processes |
title_fullStr |
Distribution of barium in the Weddell Gyre: Impact of circulation and biogeochemical processes |
title_full_unstemmed |
Distribution of barium in the Weddell Gyre: Impact of circulation and biogeochemical processes |
title_sort |
distribution of barium in the weddell gyre: impact of circulation and biogeochemical processes |
publishDate |
2010 |
url |
https://epic.awi.de/id/eprint/21789/ https://doi.org/10.1016/j.marchem.2010.07.005 https://hdl.handle.net/10013/epic.36178 |
genre |
Antarc* Antarctic Sea ice Southern Ocean Weddell Sea |
genre_facet |
Antarc* Antarctic Sea ice Southern Ocean Weddell Sea |
op_source |
EPIC3Marine Chemistry 122, pp. 118-129 |
op_relation |
Hoppema, M. orcid:0000-0002-2326-619X , Dehairs, F. , Navez, J. , Monnin, C. , Jeandel, C. , Fahrbach, E. and De Baar, H. J. W. (2010) Distribution of barium in the Weddell Gyre: Impact of circulation and biogeochemical processes , Marine Chemistry 122, pp. 118-129 . doi:10.1016/j.marchem.2010.07.005 <https://doi.org/10.1016/j.marchem.2010.07.005> , hdl:10013/epic.36178 |
op_doi |
https://doi.org/10.1016/j.marchem.2010.07.005 |
container_title |
Marine Chemistry |
container_volume |
122 |
container_issue |
1-4 |
container_start_page |
118 |
op_container_end_page |
129 |
_version_ |
1810487305277800448 |