On suspended barite and the oxygen minimum in the Southern Ocean
Particulate Ba profiles were measured in the Indian sector of the southern ocean. The largest fraction (>80%) of this barium is present as barite microcrystals. The profiles of total barium are characterized by a subsurface maximum between 200 and 500 m depth in the vicinity of the oxygen minimum...
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ftvliz:oai:oma.vliz.be:3076 2023-05-15T13:40:24+02:00 On suspended barite and the oxygen minimum in the Southern Ocean Dehairs, F.A. Goeyens, L. Stroobants, N. Bernard, P. Goyet, C. Poisson, A. Chesselet, R. 1990 http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3076 en eng http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3076 info:eu-repo/semantics/restrictedAccess iGlobal+Biogeochem.+Cycles+41i+85-102 Barite Oxygen PS Southern Ocean info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 1990 ftvliz 2022-05-01T08:14:46Z Particulate Ba profiles were measured in the Indian sector of the southern ocean. The largest fraction (>80%) of this barium is present as barite microcrystals. The profiles of total barium are characterized by a subsurface maximum between 200 and 500 m depth in the vicinity of the oxygen minimum. Highest barium values are found just south of the Polar Front, while lowest values occur close to the Antarctic Divergence. Between the divergence and the Polar front a tight inverse relationship is observed between oxygen in the oxygen minimum and barium in the barium maximum. This relationship disappears north of the Polar Front. Since suspended barite is known to be of biological origin, the correlation of barite with oxygen suggests that the observed decrease of oxygen in the oxygen minimum, between the divergence and the Polar Front is due to local consumption of oxygen. It is proposed that deep low oxygen water is advected towards the Divergence where upwelling occurs and where this water subsequently partly spreads out to the north, north-east, as entrained by the Antarctic Circumpolar Current.Oxidation of locally produced organic matter, with which barite crystals are associated, consumes oxygen and sets free individual discrete barites. As a result, oxygen decreases and barite increases away from the divergence, with barite integrating former biological processes. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean Flanders Marine Institute (VLIZ): Open Marine Archive (OMA) Antarctic Indian Southern Ocean The Antarctic |
institution |
Open Polar |
collection |
Flanders Marine Institute (VLIZ): Open Marine Archive (OMA) |
op_collection_id |
ftvliz |
language |
English |
topic |
Barite Oxygen PS Southern Ocean |
spellingShingle |
Barite Oxygen PS Southern Ocean Dehairs, F.A. Goeyens, L. Stroobants, N. Bernard, P. Goyet, C. Poisson, A. Chesselet, R. On suspended barite and the oxygen minimum in the Southern Ocean |
topic_facet |
Barite Oxygen PS Southern Ocean |
description |
Particulate Ba profiles were measured in the Indian sector of the southern ocean. The largest fraction (>80%) of this barium is present as barite microcrystals. The profiles of total barium are characterized by a subsurface maximum between 200 and 500 m depth in the vicinity of the oxygen minimum. Highest barium values are found just south of the Polar Front, while lowest values occur close to the Antarctic Divergence. Between the divergence and the Polar front a tight inverse relationship is observed between oxygen in the oxygen minimum and barium in the barium maximum. This relationship disappears north of the Polar Front. Since suspended barite is known to be of biological origin, the correlation of barite with oxygen suggests that the observed decrease of oxygen in the oxygen minimum, between the divergence and the Polar Front is due to local consumption of oxygen. It is proposed that deep low oxygen water is advected towards the Divergence where upwelling occurs and where this water subsequently partly spreads out to the north, north-east, as entrained by the Antarctic Circumpolar Current.Oxidation of locally produced organic matter, with which barite crystals are associated, consumes oxygen and sets free individual discrete barites. As a result, oxygen decreases and barite increases away from the divergence, with barite integrating former biological processes. |
format |
Article in Journal/Newspaper |
author |
Dehairs, F.A. Goeyens, L. Stroobants, N. Bernard, P. Goyet, C. Poisson, A. Chesselet, R. |
author_facet |
Dehairs, F.A. Goeyens, L. Stroobants, N. Bernard, P. Goyet, C. Poisson, A. Chesselet, R. |
author_sort |
Dehairs, F.A. |
title |
On suspended barite and the oxygen minimum in the Southern Ocean |
title_short |
On suspended barite and the oxygen minimum in the Southern Ocean |
title_full |
On suspended barite and the oxygen minimum in the Southern Ocean |
title_fullStr |
On suspended barite and the oxygen minimum in the Southern Ocean |
title_full_unstemmed |
On suspended barite and the oxygen minimum in the Southern Ocean |
title_sort |
on suspended barite and the oxygen minimum in the southern ocean |
publishDate |
1990 |
url |
http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3076 |
geographic |
Antarctic Indian Southern Ocean The Antarctic |
geographic_facet |
Antarctic Indian Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
iGlobal+Biogeochem.+Cycles+41i+85-102 |
op_relation |
http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3076 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
_version_ |
1766133089748123648 |