Barium accumulation in the Atlantic sector of the Southern Ocean - results from 190,000 year records..

Nürnberg, Christine C., Bohrmann, Gerhard, Schlüter, Michael and Frank, Martin (1997) Barium accumulation in the Atlantic sector of the Southern Ocean - results from 190,000 year records.. Open Access Paleoceanography, 12 (4). pp. 594-603. DOI 10.1029/97PA01130.

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Abstract

Extensive investigations of sedimentary barium were performed in the southern South Atlantic in order to assess the reliability of the barium signal in Antarctic sediments as a proxy for paleoproductivity. Maximum accumulation rates of excess barium were calculated for the Antarctic zone south of the polar front where silica accumulates at high rates. The correspondence between barium and opal supports the applicability of barium as a proxy for productivity. Within the Antarctic zone north of today's average sea ice maximum, interglacial vertical rain rates of excess barium are high, with a maximum occurring during the last deglaciation and early Holocene and during oxygen isotope chronozone 5.5. During these periods, the maximum silica accumulation was supposedly located south of the polar front. Glacial paleoproductivity, instead, was low within the Antarctic zone. North of the polar front, significantly higher barium accumulation occurs during glacial times. The vertical rain rates, however, are as high as in the glacial Antarctic zone. Therefore there was no evidence for an increased productivity in the glacial Southern Ocean.

Document Type: Article
Keywords: Barium, southern South Atlantic, Antarctic zone
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1029/97PA01130
ISSN: 0883-8305
Date Deposited: 12 Sep 2008 15:05
Last Modified: 09 Jan 2018 13:41
URI: http://oceanrep.geomar.de/id/eprint/5821

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