Orbital‐ and millennial‐scale paleoceanographic changes in the north‐eastern Japan Basin, East Sea/Japan Sea during the late Quaternary
Abstract Two gravity sediment cores (GH99‐1239 and GH99‐1246) obtained from the north‐eastern Japan Basin in the East Sea/Japan Sea were analyzed for the orbital‐ and millennial‐scale paleoceanographic changes. Chronostratigraphically, core GH99‐1239 represents a continuous sedimentary record since...
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crwiley:10.1002/jqs.1554 2024-06-02T08:14:21+00:00 Orbital‐ and millennial‐scale paleoceanographic changes in the north‐eastern Japan Basin, East Sea/Japan Sea during the late Quaternary Khim, Boo‐Keun Ikehara, Ken Irino, Tomohisa 2011 http://dx.doi.org/10.1002/jqs.1554 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjqs.1554 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.1554 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Quaternary Science volume 27, issue 3, page 328-335 ISSN 0267-8179 1099-1417 journal-article 2011 crwiley https://doi.org/10.1002/jqs.1554 2024-05-03T11:19:12Z Abstract Two gravity sediment cores (GH99‐1239 and GH99‐1246) obtained from the north‐eastern Japan Basin in the East Sea/Japan Sea were analyzed for the orbital‐ and millennial‐scale paleoceanographic changes. Chronostratigraphically, core GH99‐1239 represents a continuous sedimentary record since 32 ka, based on correlation of distinct lithological markers (i.e. dark layer or TL layer) with those in core GH98‐1232 collected nearby. For core GH99‐1246, the age model is constructed through correlation of lightness ( L *) values and tephra (Aso‐4 and Toya) layers with those in the well‐dated Oki Ridge core (MD01‐2407), indicating about 134 ka of sedimentation since the latest Marine Isotope Stage (MIS) 6. New geochemical data from both cores corroborate orbital‐scale paleoceanographic variation, such that surface‐water productivity, represented by biogenic opal and total organic carbon (TOC) contents, increased during MIS 1 and MIS 5; CaCO 3 contents do not show such distinct glacial–interglacial cycles, but were influenced by dissolution and preservation rather than foraminiferal production. During the glacial periods when sea ice was prevalent, surface‐water productivity was low, and bottom‐water conditions became anoxic, as indicated by high total sulfur (TS) contents and high Mo concentrations. The geochemical data further document millennial‐scale paleoceanographic variability, corresponding to a series of thin TL layers in response to Dansgaard–Oeschger cycles but irrespective of the glacial or interglacial periods. In particular, thin TL layers formed during MIS 3 are characterized by less TOC (about 1%) and TS (about 0.4%) contents and lower Mo (about 5 p.p.m.) concentration, whereas those during MIS 4 and MIS 5 exhibit more TOC (up to 4%) and TS (up to 5%) contents and higher Mo (up to 120 p.p.m.) concentration. Such a discrepancy is attributed to different degree of surface‐water productivity and of bottom‐water oxygenation, which is closely related to the sea level position and extent of ventilation. ... Article in Journal/Newspaper Sea ice Wiley Online Library Journal of Quaternary Science 27 3 328 335 |
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English |
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Abstract Two gravity sediment cores (GH99‐1239 and GH99‐1246) obtained from the north‐eastern Japan Basin in the East Sea/Japan Sea were analyzed for the orbital‐ and millennial‐scale paleoceanographic changes. Chronostratigraphically, core GH99‐1239 represents a continuous sedimentary record since 32 ka, based on correlation of distinct lithological markers (i.e. dark layer or TL layer) with those in core GH98‐1232 collected nearby. For core GH99‐1246, the age model is constructed through correlation of lightness ( L *) values and tephra (Aso‐4 and Toya) layers with those in the well‐dated Oki Ridge core (MD01‐2407), indicating about 134 ka of sedimentation since the latest Marine Isotope Stage (MIS) 6. New geochemical data from both cores corroborate orbital‐scale paleoceanographic variation, such that surface‐water productivity, represented by biogenic opal and total organic carbon (TOC) contents, increased during MIS 1 and MIS 5; CaCO 3 contents do not show such distinct glacial–interglacial cycles, but were influenced by dissolution and preservation rather than foraminiferal production. During the glacial periods when sea ice was prevalent, surface‐water productivity was low, and bottom‐water conditions became anoxic, as indicated by high total sulfur (TS) contents and high Mo concentrations. The geochemical data further document millennial‐scale paleoceanographic variability, corresponding to a series of thin TL layers in response to Dansgaard–Oeschger cycles but irrespective of the glacial or interglacial periods. In particular, thin TL layers formed during MIS 3 are characterized by less TOC (about 1%) and TS (about 0.4%) contents and lower Mo (about 5 p.p.m.) concentration, whereas those during MIS 4 and MIS 5 exhibit more TOC (up to 4%) and TS (up to 5%) contents and higher Mo (up to 120 p.p.m.) concentration. Such a discrepancy is attributed to different degree of surface‐water productivity and of bottom‐water oxygenation, which is closely related to the sea level position and extent of ventilation. ... |
format |
Article in Journal/Newspaper |
author |
Khim, Boo‐Keun Ikehara, Ken Irino, Tomohisa |
spellingShingle |
Khim, Boo‐Keun Ikehara, Ken Irino, Tomohisa Orbital‐ and millennial‐scale paleoceanographic changes in the north‐eastern Japan Basin, East Sea/Japan Sea during the late Quaternary |
author_facet |
Khim, Boo‐Keun Ikehara, Ken Irino, Tomohisa |
author_sort |
Khim, Boo‐Keun |
title |
Orbital‐ and millennial‐scale paleoceanographic changes in the north‐eastern Japan Basin, East Sea/Japan Sea during the late Quaternary |
title_short |
Orbital‐ and millennial‐scale paleoceanographic changes in the north‐eastern Japan Basin, East Sea/Japan Sea during the late Quaternary |
title_full |
Orbital‐ and millennial‐scale paleoceanographic changes in the north‐eastern Japan Basin, East Sea/Japan Sea during the late Quaternary |
title_fullStr |
Orbital‐ and millennial‐scale paleoceanographic changes in the north‐eastern Japan Basin, East Sea/Japan Sea during the late Quaternary |
title_full_unstemmed |
Orbital‐ and millennial‐scale paleoceanographic changes in the north‐eastern Japan Basin, East Sea/Japan Sea during the late Quaternary |
title_sort |
orbital‐ and millennial‐scale paleoceanographic changes in the north‐eastern japan basin, east sea/japan sea during the late quaternary |
publisher |
Wiley |
publishDate |
2011 |
url |
http://dx.doi.org/10.1002/jqs.1554 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjqs.1554 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.1554 |
genre |
Sea ice |
genre_facet |
Sea ice |
op_source |
Journal of Quaternary Science volume 27, issue 3, page 328-335 ISSN 0267-8179 1099-1417 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/jqs.1554 |
container_title |
Journal of Quaternary Science |
container_volume |
27 |
container_issue |
3 |
container_start_page |
328 |
op_container_end_page |
335 |
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1800738174966693888 |