Ba distribution in surface Southern Ocean sediments and export production estimates
We present excess Ba (Baxs) data (i.e., total Ba corrected for lithogenic Ba) for surface sediments from a north-south transect between the Polar Front Zone and the northern Weddell Gyre in the Atlantic sector and between the Polar Front Zone and the Antarctic continent in the Indian sector. Focus i...
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Amer Geophysical Union
2002
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Online Access: | https://doi.org/10.1029/2000PA000552 https://archimer.ifremer.fr/doc/00223/33392/31868.pdf https://archimer.ifremer.fr/doc/00223/33392/ |
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fttriple:oai:gotriple.eu:10670/1.ko2voe 2023-05-15T14:05:29+02:00 Ba distribution in surface Southern Ocean sediments and export production estimates Fagel, N Dehairs, F Andre, L Bareille, G Monnin, C 2002-01-01 https://doi.org/10.1029/2000PA000552 https://archimer.ifremer.fr/doc/00223/33392/31868.pdf https://archimer.ifremer.fr/doc/00223/33392/ en eng Amer Geophysical Union doi:10.1029/2000PA000552 10670/1.ko2voe https://archimer.ifremer.fr/doc/00223/33392/31868.pdf https://archimer.ifremer.fr/doc/00223/33392/ other Archimer, archive institutionnelle de l'Ifremer Paleoceanography (0883-8305) (Amer Geophysical Union), 2002-03 , Vol. 17 , N. 2 , P. 1.1-1.20 geo envir Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ 2002 fttriple https://doi.org/10.1029/2000PA000552 2023-01-22T16:43:50Z We present excess Ba (Baxs) data (i.e., total Ba corrected for lithogenic Ba) for surface sediments from a north-south transect between the Polar Front Zone and the northern Weddell Gyre in the Atlantic sector and between the Polar Front Zone and the Antarctic continent in the Indian sector. Focus is on two different processes that affect excess Ba accumulation in the sediments: sediment redistribution and excess Ba dissolution. The effect of these processes needs to be corrected for in order to convert accumulation rate into vertical rain rate, the flux component that can be linked to export production. In the Southern Ocean a major process affecting Ba accumulation rate is sediment focusing, which is corrected for using excess (230)Th. This correction, however, may not always be straightforward because of boundary scavenging effects. A further major process affecting excess Ba accumulation is barite dissolution during exposure at the sediment-water column interface. Export production estimates derived from excess (230)Th and barite dissolution corrected Baxs accumulation rates (i.e., excess Ba vertical rain rates) are of the same magnitude but generally larger than export production estimates based on water column proxies ((234)Th-deficit in the upper water column; particulate excess Ba enrichment in the mesopelagic water column). We believe export production values based on excess Ba vertical rain rate might be overestimated due to inaccurate assessment of the Baxs preservation rate. Barite dissolution has, in general, been taken into account by relating it to exposure time before burial depending on the rate of sediment accumulation. However, the observed decrease of excess Ba content with increasing water column depth (or increasing hydrostatic pressure) illustrates the dependence of barite preservation on degree of saturation in the deep water column in accordance with available thermodynamic data. Therefore correction for barite dissolution would not be appropriate by considering only exposure time of the ... Text Antarc* Antarctic Southern Ocean Unknown Antarctic Indian Southern Ocean The Antarctic Weddell Paleoceanography 17 2 1-1 1-20 |
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English |
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geo envir Fagel, N Dehairs, F Andre, L Bareille, G Monnin, C Ba distribution in surface Southern Ocean sediments and export production estimates |
topic_facet |
geo envir |
description |
We present excess Ba (Baxs) data (i.e., total Ba corrected for lithogenic Ba) for surface sediments from a north-south transect between the Polar Front Zone and the northern Weddell Gyre in the Atlantic sector and between the Polar Front Zone and the Antarctic continent in the Indian sector. Focus is on two different processes that affect excess Ba accumulation in the sediments: sediment redistribution and excess Ba dissolution. The effect of these processes needs to be corrected for in order to convert accumulation rate into vertical rain rate, the flux component that can be linked to export production. In the Southern Ocean a major process affecting Ba accumulation rate is sediment focusing, which is corrected for using excess (230)Th. This correction, however, may not always be straightforward because of boundary scavenging effects. A further major process affecting excess Ba accumulation is barite dissolution during exposure at the sediment-water column interface. Export production estimates derived from excess (230)Th and barite dissolution corrected Baxs accumulation rates (i.e., excess Ba vertical rain rates) are of the same magnitude but generally larger than export production estimates based on water column proxies ((234)Th-deficit in the upper water column; particulate excess Ba enrichment in the mesopelagic water column). We believe export production values based on excess Ba vertical rain rate might be overestimated due to inaccurate assessment of the Baxs preservation rate. Barite dissolution has, in general, been taken into account by relating it to exposure time before burial depending on the rate of sediment accumulation. However, the observed decrease of excess Ba content with increasing water column depth (or increasing hydrostatic pressure) illustrates the dependence of barite preservation on degree of saturation in the deep water column in accordance with available thermodynamic data. Therefore correction for barite dissolution would not be appropriate by considering only exposure time of the ... |
format |
Text |
author |
Fagel, N Dehairs, F Andre, L Bareille, G Monnin, C |
author_facet |
Fagel, N Dehairs, F Andre, L Bareille, G Monnin, C |
author_sort |
Fagel, N |
title |
Ba distribution in surface Southern Ocean sediments and export production estimates |
title_short |
Ba distribution in surface Southern Ocean sediments and export production estimates |
title_full |
Ba distribution in surface Southern Ocean sediments and export production estimates |
title_fullStr |
Ba distribution in surface Southern Ocean sediments and export production estimates |
title_full_unstemmed |
Ba distribution in surface Southern Ocean sediments and export production estimates |
title_sort |
ba distribution in surface southern ocean sediments and export production estimates |
publisher |
Amer Geophysical Union |
publishDate |
2002 |
url |
https://doi.org/10.1029/2000PA000552 https://archimer.ifremer.fr/doc/00223/33392/31868.pdf https://archimer.ifremer.fr/doc/00223/33392/ |
geographic |
Antarctic Indian Southern Ocean The Antarctic Weddell |
geographic_facet |
Antarctic Indian Southern Ocean The Antarctic Weddell |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
Archimer, archive institutionnelle de l'Ifremer Paleoceanography (0883-8305) (Amer Geophysical Union), 2002-03 , Vol. 17 , N. 2 , P. 1.1-1.20 |
op_relation |
doi:10.1029/2000PA000552 10670/1.ko2voe https://archimer.ifremer.fr/doc/00223/33392/31868.pdf https://archimer.ifremer.fr/doc/00223/33392/ |
op_rights |
other |
op_doi |
https://doi.org/10.1029/2000PA000552 |
container_title |
Paleoceanography |
container_volume |
17 |
container_issue |
2 |
container_start_page |
1-1 |
op_container_end_page |
1-20 |
_version_ |
1766277390964621312 |