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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Published in:Paleoceanography
Main Authors: Cartapanis, Olivier, Tachikawa, Kazuyo, Bard, Edouard
Format: Text
Language:English
Published: Amer Geophysical Union
Subjects:
geo
Online Access:https://doi.org/10.1029/2011PA002126
https://archimer.ifremer.fr/doc/00227/33799/32550.pdf
https://archimer.ifremer.fr/doc/00227/33799/
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spelling fttriple:oai:gotriple.eu:10670/1.jodggt 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 https://doi.org/10.1029/2011PA002126 https://archimer.ifremer.fr/doc/00227/33799/32550.pdf https://archimer.ifremer.fr/doc/00227/33799/ en eng Amer Geophysical Union doi:10.1029/2011PA002126 10670/1.jodggt https://archimer.ifremer.fr/doc/00227/33799/32550.pdf https://archimer.ifremer.fr/doc/00227/33799/ other Archimer, archive institutionnelle de l'Ifremer Paleoceanography (0883-8305) (Amer Geophysical Union), 2011-10 , Vol. 26 , N. 4 / PA4208 , P. 1-17 envir geo Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ fttriple https://doi.org/10.1029/2011PA002126 2023-01-22T17:22:00Z 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. Text Dansgaard-Oeschger events Unknown Baja Pacific Paleoceanography 26 4
institution Open Polar
collection Unknown
op_collection_id fttriple
language English
topic envir
geo
spellingShingle envir
geo
Cartapanis, Olivier
Tachikawa, Kazuyo
Bard, Edouard
Northeastern Pacific oxygen minimum zone variability over the past 70 kyr: Impact of biological production and oceanic ventilation
topic_facet envir
geo
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 Text
author Cartapanis, Olivier
Tachikawa, Kazuyo
Bard, Edouard
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
url https://doi.org/10.1029/2011PA002126
https://archimer.ifremer.fr/doc/00227/33799/32550.pdf
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 Archimer, archive institutionnelle de l'Ifremer
Paleoceanography (0883-8305) (Amer Geophysical Union), 2011-10 , Vol. 26 , N. 4 / PA4208 , P. 1-17
op_relation doi:10.1029/2011PA002126
10670/1.jodggt
https://archimer.ifremer.fr/doc/00227/33799/32550.pdf
https://archimer.ifremer.fr/doc/00227/33799/
op_rights other
op_doi https://doi.org/10.1029/2011PA002126
container_title Paleoceanography
container_volume 26
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