Late Quaternary changes in intermediate water oxygenation and oxygen minimum zone, northern Japan: A benthic foraminiferal perspective
A strong oxygen minimum zone (OMZ) currently exists at upper intermediate water depths on the northern Japanese margin, NW Pacific. The OMZ results largely from a combination of high surface water productivity and poor ventilation of upper intermediate waters. We investigated late Quaternary history...
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Amer Geophysical Union
2007
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Online Access: | https://doi.org/10.1029/2005PA001234 https://archimer.ifremer.fr/doc/00236/34733/33182.pdf https://archimer.ifremer.fr/doc/00236/34733/ |
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fttriple:oai:gotriple.eu:10670/1.g0rypz 2023-05-15T16:30:21+02:00 Late Quaternary changes in intermediate water oxygenation and oxygen minimum zone, northern Japan: A benthic foraminiferal perspective Shibahara, Akihiko Ohkushi, Ken'Ichi Kennett, James P. Ikehara, Ken 2007-01-01 https://doi.org/10.1029/2005PA001234 https://archimer.ifremer.fr/doc/00236/34733/33182.pdf https://archimer.ifremer.fr/doc/00236/34733/ en eng Amer Geophysical Union doi:10.1029/2005PA001234 10670/1.g0rypz https://archimer.ifremer.fr/doc/00236/34733/33182.pdf https://archimer.ifremer.fr/doc/00236/34733/ other Archimer, archive institutionnelle de l'Ifremer Paleoceanography (0883-8305) (Amer Geophysical Union), 2007-08 , Vol. 22 , N. 3/PA3213 , P. 1-13 geo envir Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ 2007 fttriple https://doi.org/10.1029/2005PA001234 2023-01-22T18:37:30Z A strong oxygen minimum zone (OMZ) currently exists at upper intermediate water depths on the northern Japanese margin, NW Pacific. The OMZ results largely from a combination of high surface water productivity and poor ventilation of upper intermediate waters. We investigated late Quaternary history ( last 34 kyr) of ocean floor oxygenation and the OMZ using quantitative changes in benthic foraminiferal assemblages in three sediment cores taken from the continental slope off Shimokita Peninsula and Tokachi, northern Japan, at water depths between 975 and 1363 m. These cores are well located within the present-day OMZ, a region of high surface water productivity, and in close proximity to the source region of North Pacific Intermediate Water. Late Quaternary benthic foraminiferal assemblages experienced major changes in response to changes in dissolved oxygen concentration in ocean floor sediments. Foraminiferal assemblages are interpreted to represent three main groups representing oxic, suboxic, and dysoxic conditions. Assemblage changes in all three cores and hence in bottom water oxygenation coincided with late Quaternary climatic episodes, similar to that known for the southern California margin. These episodes, in turn, are correlated with orbital and millennial climate episodes in the Greenland ice core including the last glacial episode, Bolling-Allerod (B/ A), Younger Dryas, Preboreal ( earliest Holocene), early Holocene, and late Holocene. The lowest oxygen conditions, marked by dysoxic taxa and laminated sediments in one core, occurred during the B/ A and the Preboreal intervals. Suboxic taxa dominated mainly during the last glacial, the Younger Dryas, and most of the Holocene. Dysoxic conditions during the B/ A and Preboreal intervals in this region were possibly caused by high surface water productivity at times of reduced intermediate ventilation in the northwestern Pacific. Remarkable similarities are evident in the late Quaternary sequence of benthic foraminiferal assemblage change between the two ... Text Greenland Greenland ice core ice core Unknown Greenland Pacific Paleoceanography 22 3 n/a n/a |
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geo envir Shibahara, Akihiko Ohkushi, Ken'Ichi Kennett, James P. Ikehara, Ken Late Quaternary changes in intermediate water oxygenation and oxygen minimum zone, northern Japan: A benthic foraminiferal perspective |
topic_facet |
geo envir |
description |
A strong oxygen minimum zone (OMZ) currently exists at upper intermediate water depths on the northern Japanese margin, NW Pacific. The OMZ results largely from a combination of high surface water productivity and poor ventilation of upper intermediate waters. We investigated late Quaternary history ( last 34 kyr) of ocean floor oxygenation and the OMZ using quantitative changes in benthic foraminiferal assemblages in three sediment cores taken from the continental slope off Shimokita Peninsula and Tokachi, northern Japan, at water depths between 975 and 1363 m. These cores are well located within the present-day OMZ, a region of high surface water productivity, and in close proximity to the source region of North Pacific Intermediate Water. Late Quaternary benthic foraminiferal assemblages experienced major changes in response to changes in dissolved oxygen concentration in ocean floor sediments. Foraminiferal assemblages are interpreted to represent three main groups representing oxic, suboxic, and dysoxic conditions. Assemblage changes in all three cores and hence in bottom water oxygenation coincided with late Quaternary climatic episodes, similar to that known for the southern California margin. These episodes, in turn, are correlated with orbital and millennial climate episodes in the Greenland ice core including the last glacial episode, Bolling-Allerod (B/ A), Younger Dryas, Preboreal ( earliest Holocene), early Holocene, and late Holocene. The lowest oxygen conditions, marked by dysoxic taxa and laminated sediments in one core, occurred during the B/ A and the Preboreal intervals. Suboxic taxa dominated mainly during the last glacial, the Younger Dryas, and most of the Holocene. Dysoxic conditions during the B/ A and Preboreal intervals in this region were possibly caused by high surface water productivity at times of reduced intermediate ventilation in the northwestern Pacific. Remarkable similarities are evident in the late Quaternary sequence of benthic foraminiferal assemblage change between the two ... |
format |
Text |
author |
Shibahara, Akihiko Ohkushi, Ken'Ichi Kennett, James P. Ikehara, Ken |
author_facet |
Shibahara, Akihiko Ohkushi, Ken'Ichi Kennett, James P. Ikehara, Ken |
author_sort |
Shibahara, Akihiko |
title |
Late Quaternary changes in intermediate water oxygenation and oxygen minimum zone, northern Japan: A benthic foraminiferal perspective |
title_short |
Late Quaternary changes in intermediate water oxygenation and oxygen minimum zone, northern Japan: A benthic foraminiferal perspective |
title_full |
Late Quaternary changes in intermediate water oxygenation and oxygen minimum zone, northern Japan: A benthic foraminiferal perspective |
title_fullStr |
Late Quaternary changes in intermediate water oxygenation and oxygen minimum zone, northern Japan: A benthic foraminiferal perspective |
title_full_unstemmed |
Late Quaternary changes in intermediate water oxygenation and oxygen minimum zone, northern Japan: A benthic foraminiferal perspective |
title_sort |
late quaternary changes in intermediate water oxygenation and oxygen minimum zone, northern japan: a benthic foraminiferal perspective |
publisher |
Amer Geophysical Union |
publishDate |
2007 |
url |
https://doi.org/10.1029/2005PA001234 https://archimer.ifremer.fr/doc/00236/34733/33182.pdf https://archimer.ifremer.fr/doc/00236/34733/ |
geographic |
Greenland Pacific |
geographic_facet |
Greenland Pacific |
genre |
Greenland Greenland ice core ice core |
genre_facet |
Greenland Greenland ice core ice core |
op_source |
Archimer, archive institutionnelle de l'Ifremer Paleoceanography (0883-8305) (Amer Geophysical Union), 2007-08 , Vol. 22 , N. 3/PA3213 , P. 1-13 |
op_relation |
doi:10.1029/2005PA001234 10670/1.g0rypz https://archimer.ifremer.fr/doc/00236/34733/33182.pdf https://archimer.ifremer.fr/doc/00236/34733/ |
op_rights |
other |
op_doi |
https://doi.org/10.1029/2005PA001234 |
container_title |
Paleoceanography |
container_volume |
22 |
container_issue |
3 |
container_start_page |
n/a |
op_container_end_page |
n/a |
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1766020067158392832 |