Northeastern Pacific oxygen minimum zone variability over the past 70 kyr: Impact of biological production and oceanic ventilation
During the last glacial period, the Oxygen Minimum Zone (OMZ) within the northeastern Pacific Ocean strengthened and weakened on a millennial time scale, demonstrating a tight linkage with northern high latitude climate, although the precise mechanisms responsible remain unknown. Core MD02-2508, ret...
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ftarchimer:oai:archimer.ifremer.fr:33799 2023-05-15T16:00:04+02:00 Northeastern Pacific oxygen minimum zone variability over the past 70 kyr: Impact of biological production and oceanic ventilation Cartapanis, Olivier Tachikawa, Kazuyo Bard, Edouard 2011-10 application/pdf https://archimer.ifremer.fr/doc/00227/33799/32550.pdf https://doi.org/10.1029/2011PA002126 https://archimer.ifremer.fr/doc/00227/33799/ eng eng Amer Geophysical Union https://archimer.ifremer.fr/doc/00227/33799/32550.pdf doi:10.1029/2011PA002126 https://archimer.ifremer.fr/doc/00227/33799/ Copyright 2011 by the American Geophysical Union. info:eu-repo/semantics/openAccess restricted use Paleoceanography (0883-8305) (Amer Geophysical Union), 2011-10 , Vol. 26 , N. 4 / PA4208 , P. 1-17 text Publication info:eu-repo/semantics/article 2011 ftarchimer https://doi.org/10.1029/2011PA002126 2021-09-23T20:25:10Z During the last glacial period, the Oxygen Minimum Zone (OMZ) within the northeastern Pacific Ocean strengthened and weakened on a millennial time scale, demonstrating a tight linkage with northern high latitude climate, although the precise mechanisms responsible remain unknown. Core MD02-2508, retrieved off Baja California, was analyzed for major and trace elements (Br, Ca, Ti, Fe, Mn, and Sr) using a XRF scanner and redox-sensitive trace elements (Cu, Ni, Cd, As, V, Cr, Mo, and U) using the ICP-MS. The trace element content, the Fe/Ti ratio, and Br-based organic carbon exhibit higher values during the Holocene and during warm Dansgaard-Oeschger events than during the Last Glacial Maximum (LGM), stadials, and Heinrich (H) events. A principal component analysis of the element/Al ratio indicated that the following two main factors controlled the chemical composition of the sediments: (1) export production, as represented by organic carbon, that was lower during cold periods; and (2) regional intermediate water oxygenation, as represented by U and Mo variability, that was not supported by a change in export production. The latter suggests that intermediate water oxygenation improved during H events, but slightly deteriorated during late Marine Isotope Stage (MIS) 3 and MIS 2. A local biogeochemical effect, forced by atmospheric processes, impacted the LGM and H events in the same manner. Whereas regional intermediate oceanic circulation varied in an opposite manner during the LGM and H events, possibly as a result of the global reorganization of intermediate water circulation during the LGM. Article in Journal/Newspaper Dansgaard-Oeschger events Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Baja Pacific Paleoceanography 26 4 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
description |
During the last glacial period, the Oxygen Minimum Zone (OMZ) within the northeastern Pacific Ocean strengthened and weakened on a millennial time scale, demonstrating a tight linkage with northern high latitude climate, although the precise mechanisms responsible remain unknown. Core MD02-2508, retrieved off Baja California, was analyzed for major and trace elements (Br, Ca, Ti, Fe, Mn, and Sr) using a XRF scanner and redox-sensitive trace elements (Cu, Ni, Cd, As, V, Cr, Mo, and U) using the ICP-MS. The trace element content, the Fe/Ti ratio, and Br-based organic carbon exhibit higher values during the Holocene and during warm Dansgaard-Oeschger events than during the Last Glacial Maximum (LGM), stadials, and Heinrich (H) events. A principal component analysis of the element/Al ratio indicated that the following two main factors controlled the chemical composition of the sediments: (1) export production, as represented by organic carbon, that was lower during cold periods; and (2) regional intermediate water oxygenation, as represented by U and Mo variability, that was not supported by a change in export production. The latter suggests that intermediate water oxygenation improved during H events, but slightly deteriorated during late Marine Isotope Stage (MIS) 3 and MIS 2. A local biogeochemical effect, forced by atmospheric processes, impacted the LGM and H events in the same manner. Whereas regional intermediate oceanic circulation varied in an opposite manner during the LGM and H events, possibly as a result of the global reorganization of intermediate water circulation during the LGM. |
format |
Article in Journal/Newspaper |
author |
Cartapanis, Olivier Tachikawa, Kazuyo Bard, Edouard |
spellingShingle |
Cartapanis, Olivier Tachikawa, Kazuyo Bard, Edouard Northeastern Pacific oxygen minimum zone variability over the past 70 kyr: Impact of biological production and oceanic ventilation |
author_facet |
Cartapanis, Olivier Tachikawa, Kazuyo Bard, Edouard |
author_sort |
Cartapanis, Olivier |
title |
Northeastern Pacific oxygen minimum zone variability over the past 70 kyr: Impact of biological production and oceanic ventilation |
title_short |
Northeastern Pacific oxygen minimum zone variability over the past 70 kyr: Impact of biological production and oceanic ventilation |
title_full |
Northeastern Pacific oxygen minimum zone variability over the past 70 kyr: Impact of biological production and oceanic ventilation |
title_fullStr |
Northeastern Pacific oxygen minimum zone variability over the past 70 kyr: Impact of biological production and oceanic ventilation |
title_full_unstemmed |
Northeastern Pacific oxygen minimum zone variability over the past 70 kyr: Impact of biological production and oceanic ventilation |
title_sort |
northeastern pacific oxygen minimum zone variability over the past 70 kyr: impact of biological production and oceanic ventilation |
publisher |
Amer Geophysical Union |
publishDate |
2011 |
url |
https://archimer.ifremer.fr/doc/00227/33799/32550.pdf https://doi.org/10.1029/2011PA002126 https://archimer.ifremer.fr/doc/00227/33799/ |
geographic |
Baja Pacific |
geographic_facet |
Baja Pacific |
genre |
Dansgaard-Oeschger events |
genre_facet |
Dansgaard-Oeschger events |
op_source |
Paleoceanography (0883-8305) (Amer Geophysical Union), 2011-10 , Vol. 26 , N. 4 / PA4208 , P. 1-17 |
op_relation |
https://archimer.ifremer.fr/doc/00227/33799/32550.pdf doi:10.1029/2011PA002126 https://archimer.ifremer.fr/doc/00227/33799/ |
op_rights |
Copyright 2011 by the American Geophysical Union. info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1029/2011PA002126 |
container_title |
Paleoceanography |
container_volume |
26 |
container_issue |
4 |
_version_ |
1766395943582695424 |