Controls on Terrigenous Detritus Deposition and Oceanography Changes in the Central Okhotsk Sea Over the Past 1550 ka
The Okhotsk Sea, which connects the high latitude Asian continent and the North Pacific, plays an important role in modern and past climate changes due to seasonal sea ice coverage and as a precursor of the North Pacific Intermediate Water. The long-term glacial-interglacial changes of sea ice cover...
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crfrontiers:10.3389/feart.2021.683984 2024-02-11T10:05:24+01:00 Controls on Terrigenous Detritus Deposition and Oceanography Changes in the Central Okhotsk Sea Over the Past 1550 ka Chou, Yu-Min Jiang, Xiaodong Lo, Li Wang, Liang-Chi Lee, Teh-Quei Wang, Chun-Chieh Pan, Yongxin Zou, Jianjun Humbert, Fabien Liu, Zhiqiang 2021 http://dx.doi.org/10.3389/feart.2021.683984 https://www.frontiersin.org/articles/10.3389/feart.2021.683984/full unknown Frontiers Media SA https://creativecommons.org/licenses/by/4.0/ Frontiers in Earth Science volume 9 ISSN 2296-6463 General Earth and Planetary Sciences journal-article 2021 crfrontiers https://doi.org/10.3389/feart.2021.683984 2024-01-26T09:59:57Z The Okhotsk Sea, which connects the high latitude Asian continent and the North Pacific, plays an important role in modern and past climate changes due to seasonal sea ice coverage and as a precursor of the North Pacific Intermediate Water. The long-term glacial-interglacial changes of sea ice coverage and its impacts on terrigenous transport and surface primary productivity in the Okhotsk Sea remain, however, not well constrained. Base on the paleomagnetic, rock magnetic, micropaleontological (diatom), and geochemical studies of the marine sediment core MD01-2414 (53°11.77′N, 149°34.80′E, water depth: 1,123 m) taken in the central Okhotsk Sea, we reconstruct the terrigenous sediment transport and paleoceanographic variations during the past 1550 thousand years (kyr). Seventeen geomagnetic excursions are identified from the paleomagnetic directional record. Close to the bottom of the core, an excursion was observed, which is proposed to be the Gilsa event ∼1550 thousand years ago (ka). During glacial intervals, our records reveal a wide extension of sea ice coverage and low marine productivity. We observed ice-rafted debris from mountain icebergs composed of coarse and high magnetic terrigenous detritus which were derived from the Kamchatka Peninsula to the central Okhotsk basin. Still during glacial intervals, the initiation (i.e., at ∼900 ka) of the Mid-Pleistocene Transition marks the changes to even lower marine productivity, suggesting that sea-ice coverage became larger during the last 900 ka. During interglacial intervals, the central Okhotsk Sea was either devoid of sea-ice or the ice was at best seasonal; resulting in high marine productivity. The weaker formation of Okhotsk Sea Intermediate Water, lower ventilation, and microbial degradation of organic matter depleted the oxygen concentration in the bottom water and created a reduced environment condition in the sea basin. The freshwater supplied by snow or glacier melting from Siberia and Kamchatka delivered fine grain sediments to the Okhotsk Sea. ... Article in Journal/Newspaper Kamchatka Kamchatka Peninsula okhotsk sea Sea ice Siberia Frontiers (Publisher) Kamchatka Peninsula ENVELOPE(160.000,160.000,56.000,56.000) Okhotsk Pacific Frontiers in Earth Science 9 |
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Open Polar |
collection |
Frontiers (Publisher) |
op_collection_id |
crfrontiers |
language |
unknown |
topic |
General Earth and Planetary Sciences |
spellingShingle |
General Earth and Planetary Sciences Chou, Yu-Min Jiang, Xiaodong Lo, Li Wang, Liang-Chi Lee, Teh-Quei Wang, Chun-Chieh Pan, Yongxin Zou, Jianjun Humbert, Fabien Liu, Zhiqiang Controls on Terrigenous Detritus Deposition and Oceanography Changes in the Central Okhotsk Sea Over the Past 1550 ka |
topic_facet |
General Earth and Planetary Sciences |
description |
The Okhotsk Sea, which connects the high latitude Asian continent and the North Pacific, plays an important role in modern and past climate changes due to seasonal sea ice coverage and as a precursor of the North Pacific Intermediate Water. The long-term glacial-interglacial changes of sea ice coverage and its impacts on terrigenous transport and surface primary productivity in the Okhotsk Sea remain, however, not well constrained. Base on the paleomagnetic, rock magnetic, micropaleontological (diatom), and geochemical studies of the marine sediment core MD01-2414 (53°11.77′N, 149°34.80′E, water depth: 1,123 m) taken in the central Okhotsk Sea, we reconstruct the terrigenous sediment transport and paleoceanographic variations during the past 1550 thousand years (kyr). Seventeen geomagnetic excursions are identified from the paleomagnetic directional record. Close to the bottom of the core, an excursion was observed, which is proposed to be the Gilsa event ∼1550 thousand years ago (ka). During glacial intervals, our records reveal a wide extension of sea ice coverage and low marine productivity. We observed ice-rafted debris from mountain icebergs composed of coarse and high magnetic terrigenous detritus which were derived from the Kamchatka Peninsula to the central Okhotsk basin. Still during glacial intervals, the initiation (i.e., at ∼900 ka) of the Mid-Pleistocene Transition marks the changes to even lower marine productivity, suggesting that sea-ice coverage became larger during the last 900 ka. During interglacial intervals, the central Okhotsk Sea was either devoid of sea-ice or the ice was at best seasonal; resulting in high marine productivity. The weaker formation of Okhotsk Sea Intermediate Water, lower ventilation, and microbial degradation of organic matter depleted the oxygen concentration in the bottom water and created a reduced environment condition in the sea basin. The freshwater supplied by snow or glacier melting from Siberia and Kamchatka delivered fine grain sediments to the Okhotsk Sea. ... |
format |
Article in Journal/Newspaper |
author |
Chou, Yu-Min Jiang, Xiaodong Lo, Li Wang, Liang-Chi Lee, Teh-Quei Wang, Chun-Chieh Pan, Yongxin Zou, Jianjun Humbert, Fabien Liu, Zhiqiang |
author_facet |
Chou, Yu-Min Jiang, Xiaodong Lo, Li Wang, Liang-Chi Lee, Teh-Quei Wang, Chun-Chieh Pan, Yongxin Zou, Jianjun Humbert, Fabien Liu, Zhiqiang |
author_sort |
Chou, Yu-Min |
title |
Controls on Terrigenous Detritus Deposition and Oceanography Changes in the Central Okhotsk Sea Over the Past 1550 ka |
title_short |
Controls on Terrigenous Detritus Deposition and Oceanography Changes in the Central Okhotsk Sea Over the Past 1550 ka |
title_full |
Controls on Terrigenous Detritus Deposition and Oceanography Changes in the Central Okhotsk Sea Over the Past 1550 ka |
title_fullStr |
Controls on Terrigenous Detritus Deposition and Oceanography Changes in the Central Okhotsk Sea Over the Past 1550 ka |
title_full_unstemmed |
Controls on Terrigenous Detritus Deposition and Oceanography Changes in the Central Okhotsk Sea Over the Past 1550 ka |
title_sort |
controls on terrigenous detritus deposition and oceanography changes in the central okhotsk sea over the past 1550 ka |
publisher |
Frontiers Media SA |
publishDate |
2021 |
url |
http://dx.doi.org/10.3389/feart.2021.683984 https://www.frontiersin.org/articles/10.3389/feart.2021.683984/full |
long_lat |
ENVELOPE(160.000,160.000,56.000,56.000) |
geographic |
Kamchatka Peninsula Okhotsk Pacific |
geographic_facet |
Kamchatka Peninsula Okhotsk Pacific |
genre |
Kamchatka Kamchatka Peninsula okhotsk sea Sea ice Siberia |
genre_facet |
Kamchatka Kamchatka Peninsula okhotsk sea Sea ice Siberia |
op_source |
Frontiers in Earth Science volume 9 ISSN 2296-6463 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3389/feart.2021.683984 |
container_title |
Frontiers in Earth Science |
container_volume |
9 |
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1790602431043731456 |