Image2_Intermediate- and Deep-Water Oxygenation History in the Subarctic North Pacific During the Last Deglacial Period.JPEG

Deglacial dissolved oxygen concentrations were semiquantitatively estimated for intermediate and deep waters in the western Bering Sea using the benthic foraminiferal-based transfer function developed by Tetard et al. (2017), Tetard et al. (2021a). Benthic foraminiferal assemblages were analyzed fro...

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Main Authors: Ekaterina Ovsepyan (11381676), Elena Ivanova (150268), Martin Tetard (11381679), Lars Max (11381682), Ralf Tiedemann (3003807)
Format: Still Image
Language:unknown
Published: 2021
Subjects:
Online Access:https://doi.org/10.3389/feart.2021.638069.s004
id ftsmithonian:oai:figshare.com:article/16565505
record_format openpolar
spelling ftsmithonian:oai:figshare.com:article/16565505 2023-05-15T13:44:11+02:00 Image2_Intermediate- and Deep-Water Oxygenation History in the Subarctic North Pacific During the Last Deglacial Period.JPEG Ekaterina Ovsepyan (11381676) Elena Ivanova (150268) Martin Tetard (11381679) Lars Max (11381682) Ralf Tiedemann (3003807) 2021-09-03T05:41:35Z https://doi.org/10.3389/feart.2021.638069.s004 unknown https://figshare.com/articles/figure/Image2_Intermediate-_and_Deep-Water_Oxygenation_History_in_the_Subarctic_North_Pacific_During_the_Last_Deglacial_Period_JPEG/16565505 doi:10.3389/feart.2021.638069.s004 CC BY 4.0 CC-BY Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change oxygen minimum zone ocean circulation sea-surface bioproductivity teleconnections transfer function benthic foraminifers North Pacific Southern Ocean Image Figure 2021 ftsmithonian https://doi.org/10.3389/feart.2021.638069.s004 2021-12-20T02:56:20Z Deglacial dissolved oxygen concentrations were semiquantitatively estimated for intermediate and deep waters in the western Bering Sea using the benthic foraminiferal-based transfer function developed by Tetard et al. (2017), Tetard et al. (2021a). Benthic foraminiferal assemblages were analyzed from two sediment cores, SO201-2-85KL (963 m below sea level (mbsl), the intermediate-water core) and SO201-2-77KL (2,163 mbsl, the deep-water core), collected from the Shirshov Ridge in the western Bering Sea. Intermediate waters were characterized by an oxygen content of ∼2.0 ml L −1 or more during the Last Glacial Maximum (LGM)–Heinrich 1 (H1), around 0.15 ml L −1 during the middle Bølling/Allerød (B/A)–Early Holocene (EH), and a slight increase in [O 2 ] (∼0.20 ml L −1 ) at the beginning of the Younger Dryas (YD) mbsl. Deep-water oxygen concentrations ranged from 0.9 to 2.5 ml L −1 during the LGM–H1, hovered around 0.08 ml L −1 at the onset of B/A, and were within the 0.30–0.85 ml L −1 range from the middle B/A to the first half of YD and the 1.0–1.7 ml L −1 range from the middle to late Holocene. The [O 2 ] variations remind the δ 18 O NGRIP record thereby providing evidence for a link between the Bering Sea oxygenation at intermediate depths and the deglacial North Atlantic climate. Changes in the deep-water oxygen concentrations mostly resemble the deglacial dynamics of the Southern Ocean upwelling intensity which is supposed to be closely coupled with the Antarctic climate variability. This coherence suggests that deglacial deep-water [O 2 ] variations were primarily controlled by changes in the circulation of southern-sourced waters. Nevertheless, the signal from the south at the deeper site might be amplified by the Northern Hemisphere climate warming via an increase in sea-surface bioproductivity during the B/A and EH. A semi-enclosed position of the Bering Sea and sea-level oscillations might significantly contribute to the magnitude of oxygenation changes in the study area during the last deglaciation. Interregional correlation of different proxy data from a wide range of water depths indicates that deglacial oxygenation changes were more pronounced in the Bering and Okhotsk marginal seas than along the open-ocean continental margin and abyssal settings of the North Pacific. Still Image Antarc* Antarctic Bering Sea NGRIP North Atlantic Southern Ocean Subarctic Unknown Antarctic Southern Ocean The Antarctic Bering Sea Okhotsk Pacific Shirshov Ridge ENVELOPE(171.000,171.000,57.500,57.500)
institution Open Polar
collection Unknown
op_collection_id ftsmithonian
language unknown
topic Solid Earth Sciences
Climate Science
Atmospheric Sciences not elsewhere classified
Exploration Geochemistry
Inorganic Geochemistry
Isotope Geochemistry
Organic Geochemistry
Geochemistry not elsewhere classified
Igneous and Metamorphic Petrology
Ore Deposit Petrology
Palaeontology (incl. Palynology)
Structural Geology
Tectonics
Volcanology
Geology not elsewhere classified
Seismology and Seismic Exploration
Glaciology
Hydrogeology
Natural Hazards
Quaternary Environments
Earth Sciences not elsewhere classified
Evolutionary Impacts of Climate Change
oxygen minimum zone
ocean circulation
sea-surface bioproductivity
teleconnections
transfer function
benthic foraminifers
North Pacific
Southern Ocean
spellingShingle Solid Earth Sciences
Climate Science
Atmospheric Sciences not elsewhere classified
Exploration Geochemistry
Inorganic Geochemistry
Isotope Geochemistry
Organic Geochemistry
Geochemistry not elsewhere classified
Igneous and Metamorphic Petrology
Ore Deposit Petrology
Palaeontology (incl. Palynology)
Structural Geology
Tectonics
Volcanology
Geology not elsewhere classified
Seismology and Seismic Exploration
Glaciology
Hydrogeology
Natural Hazards
Quaternary Environments
Earth Sciences not elsewhere classified
Evolutionary Impacts of Climate Change
oxygen minimum zone
ocean circulation
sea-surface bioproductivity
teleconnections
transfer function
benthic foraminifers
North Pacific
Southern Ocean
Ekaterina Ovsepyan (11381676)
Elena Ivanova (150268)
Martin Tetard (11381679)
Lars Max (11381682)
Ralf Tiedemann (3003807)
Image2_Intermediate- and Deep-Water Oxygenation History in the Subarctic North Pacific During the Last Deglacial Period.JPEG
topic_facet Solid Earth Sciences
Climate Science
Atmospheric Sciences not elsewhere classified
Exploration Geochemistry
Inorganic Geochemistry
Isotope Geochemistry
Organic Geochemistry
Geochemistry not elsewhere classified
Igneous and Metamorphic Petrology
Ore Deposit Petrology
Palaeontology (incl. Palynology)
Structural Geology
Tectonics
Volcanology
Geology not elsewhere classified
Seismology and Seismic Exploration
Glaciology
Hydrogeology
Natural Hazards
Quaternary Environments
Earth Sciences not elsewhere classified
Evolutionary Impacts of Climate Change
oxygen minimum zone
ocean circulation
sea-surface bioproductivity
teleconnections
transfer function
benthic foraminifers
North Pacific
Southern Ocean
description Deglacial dissolved oxygen concentrations were semiquantitatively estimated for intermediate and deep waters in the western Bering Sea using the benthic foraminiferal-based transfer function developed by Tetard et al. (2017), Tetard et al. (2021a). Benthic foraminiferal assemblages were analyzed from two sediment cores, SO201-2-85KL (963 m below sea level (mbsl), the intermediate-water core) and SO201-2-77KL (2,163 mbsl, the deep-water core), collected from the Shirshov Ridge in the western Bering Sea. Intermediate waters were characterized by an oxygen content of ∼2.0 ml L −1 or more during the Last Glacial Maximum (LGM)–Heinrich 1 (H1), around 0.15 ml L −1 during the middle Bølling/Allerød (B/A)–Early Holocene (EH), and a slight increase in [O 2 ] (∼0.20 ml L −1 ) at the beginning of the Younger Dryas (YD) mbsl. Deep-water oxygen concentrations ranged from 0.9 to 2.5 ml L −1 during the LGM–H1, hovered around 0.08 ml L −1 at the onset of B/A, and were within the 0.30–0.85 ml L −1 range from the middle B/A to the first half of YD and the 1.0–1.7 ml L −1 range from the middle to late Holocene. The [O 2 ] variations remind the δ 18 O NGRIP record thereby providing evidence for a link between the Bering Sea oxygenation at intermediate depths and the deglacial North Atlantic climate. Changes in the deep-water oxygen concentrations mostly resemble the deglacial dynamics of the Southern Ocean upwelling intensity which is supposed to be closely coupled with the Antarctic climate variability. This coherence suggests that deglacial deep-water [O 2 ] variations were primarily controlled by changes in the circulation of southern-sourced waters. Nevertheless, the signal from the south at the deeper site might be amplified by the Northern Hemisphere climate warming via an increase in sea-surface bioproductivity during the B/A and EH. A semi-enclosed position of the Bering Sea and sea-level oscillations might significantly contribute to the magnitude of oxygenation changes in the study area during the last deglaciation. Interregional correlation of different proxy data from a wide range of water depths indicates that deglacial oxygenation changes were more pronounced in the Bering and Okhotsk marginal seas than along the open-ocean continental margin and abyssal settings of the North Pacific.
format Still Image
author Ekaterina Ovsepyan (11381676)
Elena Ivanova (150268)
Martin Tetard (11381679)
Lars Max (11381682)
Ralf Tiedemann (3003807)
author_facet Ekaterina Ovsepyan (11381676)
Elena Ivanova (150268)
Martin Tetard (11381679)
Lars Max (11381682)
Ralf Tiedemann (3003807)
author_sort Ekaterina Ovsepyan (11381676)
title Image2_Intermediate- and Deep-Water Oxygenation History in the Subarctic North Pacific During the Last Deglacial Period.JPEG
title_short Image2_Intermediate- and Deep-Water Oxygenation History in the Subarctic North Pacific During the Last Deglacial Period.JPEG
title_full Image2_Intermediate- and Deep-Water Oxygenation History in the Subarctic North Pacific During the Last Deglacial Period.JPEG
title_fullStr Image2_Intermediate- and Deep-Water Oxygenation History in the Subarctic North Pacific During the Last Deglacial Period.JPEG
title_full_unstemmed Image2_Intermediate- and Deep-Water Oxygenation History in the Subarctic North Pacific During the Last Deglacial Period.JPEG
title_sort image2_intermediate- and deep-water oxygenation history in the subarctic north pacific during the last deglacial period.jpeg
publishDate 2021
url https://doi.org/10.3389/feart.2021.638069.s004
long_lat ENVELOPE(171.000,171.000,57.500,57.500)
geographic Antarctic
Southern Ocean
The Antarctic
Bering Sea
Okhotsk
Pacific
Shirshov Ridge
geographic_facet Antarctic
Southern Ocean
The Antarctic
Bering Sea
Okhotsk
Pacific
Shirshov Ridge
genre Antarc*
Antarctic
Bering Sea
NGRIP
North Atlantic
Southern Ocean
Subarctic
genre_facet Antarc*
Antarctic
Bering Sea
NGRIP
North Atlantic
Southern Ocean
Subarctic
op_relation https://figshare.com/articles/figure/Image2_Intermediate-_and_Deep-Water_Oxygenation_History_in_the_Subarctic_North_Pacific_During_the_Last_Deglacial_Period_JPEG/16565505
doi:10.3389/feart.2021.638069.s004
op_rights CC BY 4.0
op_rightsnorm CC-BY
op_doi https://doi.org/10.3389/feart.2021.638069.s004
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