Glacial water mass geometry and the distribution of δ13C of ΣCO2 in the western Atlantic Ocean
Author Posting. © American Geophysical Union, 2005. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Paleoceanography 20 (2005): PA1017, doi:10.1029/2004PA001021. Oxygen and carbon isotopic data...
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/3432 2023-05-15T18:21:14+02:00 Glacial water mass geometry and the distribution of δ13C of ΣCO2 in the western Atlantic Ocean Curry, William B. Oppo, Delia W. 2005-03-18 application/pdf text/plain application/postscript https://hdl.handle.net/1912/3432 en_US eng American Geophysical Union https://doi.org/10.1029/2004PA001021 Paleoceanography 20 (2005): PA1017 https://hdl.handle.net/1912/3432 doi:10.1029/2004PA001021 Paleoceanography 20 (2005): PA1017 doi:10.1029/2004PA001021 Ice age Ocean circulation Ocean chemistry Article 2005 ftwhoas https://doi.org/10.1029/2004PA001021 2022-05-28T22:57:58Z Author Posting. © American Geophysical Union, 2005. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Paleoceanography 20 (2005): PA1017, doi:10.1029/2004PA001021. Oxygen and carbon isotopic data were produced on the benthic foraminiferal taxa Cibicidoides and Planulina from 25 new piston cores, gravity cores, and multicores from the Brazil margin. The cores span water depths from about 400 to 3000 m and intersect the major water masses in this region. These new data fill a critical gap in the South Atlantic Ocean and provide the motivation for updating the classic glacial western Atlantic δ13C transect of Duplessy et al. (1988). The distribution of δ13C of ΣCO2 requires the presence of three distinct water masses in the glacial Atlantic Ocean: a shallow (∼1000 m), southern source water mass with an end-member δ13C value of about 0.3–0.5‰ VPDB, a middepth (∼1500 m), northern source water mass with an end-member value of about 1.5‰, and a deep (>2000 m), southern source water with an end-member value of less than −0.2‰, and perhaps as low as the −0.9‰ values observed in the South Atlantic sector of the Southern Ocean (Ninnemann and Charles, 2002). The origins of the water masses are supported by the meridional gradients in benthic foraminiferal δ18O. A revised glacial section of deep water δ13C documents the positions and gradients among these end-member intermediate and deep water masses. The large property gradients in the presence of strong vertical mixing can only be maintained by a vigorous overturning circulation. This research was supported by the National Science Foundation by grants OCE-9986748 and OCE-9905605. Article in Journal/Newspaper South Atlantic Ocean Southern Ocean Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Southern Ocean Paleoceanography 20 1 n/a n/a |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
Ice age Ocean circulation Ocean chemistry |
spellingShingle |
Ice age Ocean circulation Ocean chemistry Curry, William B. Oppo, Delia W. Glacial water mass geometry and the distribution of δ13C of ΣCO2 in the western Atlantic Ocean |
topic_facet |
Ice age Ocean circulation Ocean chemistry |
description |
Author Posting. © American Geophysical Union, 2005. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Paleoceanography 20 (2005): PA1017, doi:10.1029/2004PA001021. Oxygen and carbon isotopic data were produced on the benthic foraminiferal taxa Cibicidoides and Planulina from 25 new piston cores, gravity cores, and multicores from the Brazil margin. The cores span water depths from about 400 to 3000 m and intersect the major water masses in this region. These new data fill a critical gap in the South Atlantic Ocean and provide the motivation for updating the classic glacial western Atlantic δ13C transect of Duplessy et al. (1988). The distribution of δ13C of ΣCO2 requires the presence of three distinct water masses in the glacial Atlantic Ocean: a shallow (∼1000 m), southern source water mass with an end-member δ13C value of about 0.3–0.5‰ VPDB, a middepth (∼1500 m), northern source water mass with an end-member value of about 1.5‰, and a deep (>2000 m), southern source water with an end-member value of less than −0.2‰, and perhaps as low as the −0.9‰ values observed in the South Atlantic sector of the Southern Ocean (Ninnemann and Charles, 2002). The origins of the water masses are supported by the meridional gradients in benthic foraminiferal δ18O. A revised glacial section of deep water δ13C documents the positions and gradients among these end-member intermediate and deep water masses. The large property gradients in the presence of strong vertical mixing can only be maintained by a vigorous overturning circulation. This research was supported by the National Science Foundation by grants OCE-9986748 and OCE-9905605. |
format |
Article in Journal/Newspaper |
author |
Curry, William B. Oppo, Delia W. |
author_facet |
Curry, William B. Oppo, Delia W. |
author_sort |
Curry, William B. |
title |
Glacial water mass geometry and the distribution of δ13C of ΣCO2 in the western Atlantic Ocean |
title_short |
Glacial water mass geometry and the distribution of δ13C of ΣCO2 in the western Atlantic Ocean |
title_full |
Glacial water mass geometry and the distribution of δ13C of ΣCO2 in the western Atlantic Ocean |
title_fullStr |
Glacial water mass geometry and the distribution of δ13C of ΣCO2 in the western Atlantic Ocean |
title_full_unstemmed |
Glacial water mass geometry and the distribution of δ13C of ΣCO2 in the western Atlantic Ocean |
title_sort |
glacial water mass geometry and the distribution of δ13c of σco2 in the western atlantic ocean |
publisher |
American Geophysical Union |
publishDate |
2005 |
url |
https://hdl.handle.net/1912/3432 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
South Atlantic Ocean Southern Ocean |
genre_facet |
South Atlantic Ocean Southern Ocean |
op_source |
Paleoceanography 20 (2005): PA1017 doi:10.1029/2004PA001021 |
op_relation |
https://doi.org/10.1029/2004PA001021 Paleoceanography 20 (2005): PA1017 https://hdl.handle.net/1912/3432 doi:10.1029/2004PA001021 |
op_doi |
https://doi.org/10.1029/2004PA001021 |
container_title |
Paleoceanography |
container_volume |
20 |
container_issue |
1 |
container_start_page |
n/a |
op_container_end_page |
n/a |
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1766200398781087744 |