Pulses of enhanced North Pacific Intermediate Water ventilation from the Okhotsk Sea and Bering Sea during the last deglaciation
Under modern conditions only North Pacific Intermediate Water is formed in the northwest Pacific Ocean. This situation might have changed in the past. Recent studies with general circulation models indicate a switch to deep-water formation in the northwest Pacific during Heinrich Stadial 1 (17.5–15....
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ftdoajarticles:oai:doaj.org/article:81403064469f4cb29d007830e9e7fabd 2023-05-15T15:43:38+02:00 Pulses of enhanced North Pacific Intermediate Water ventilation from the Okhotsk Sea and Bering Sea during the last deglaciation L. Max L. Lembke-Jene J.-R. Riethdorf R. Tiedemann D. Nürnberg H. Kühn A. Mackensen 2014-03-01T00:00:00Z https://doi.org/10.5194/cp-10-591-2014 https://doaj.org/article/81403064469f4cb29d007830e9e7fabd EN eng Copernicus Publications http://www.clim-past.net/10/591/2014/cp-10-591-2014.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 1814-9324 1814-9332 doi:10.5194/cp-10-591-2014 https://doaj.org/article/81403064469f4cb29d007830e9e7fabd Climate of the Past, Vol 10, Iss 2, Pp 591-605 (2014) Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 article 2014 ftdoajarticles https://doi.org/10.5194/cp-10-591-2014 2022-12-31T09:23:52Z Under modern conditions only North Pacific Intermediate Water is formed in the northwest Pacific Ocean. This situation might have changed in the past. Recent studies with general circulation models indicate a switch to deep-water formation in the northwest Pacific during Heinrich Stadial 1 (17.5–15.0 ka) of the last glacial termination. Reconstructions of past ventilation changes based on paleoceanographic proxy records are still insufficient to test whether a deglacial mode of deep-water formation in the North Pacific Ocean existed. Here we present deglacial ventilation records based on radiocarbon-derived ventilation ages in combination with epibenthic stable carbon isotopes from the northwest Pacific including the Okhotsk Sea and Bering Sea, the two potential source regions for past North Pacific ventilation changes. Evidence for most rigorous ventilation of the intermediate-depth North Pacific occurred during Heinrich Stadial 1 and the Younger Dryas, simultaneous to significant reductions in Atlantic Meridional Overturning Circulation. Concurrent changes in δ 13 C and ventilation ages point to the Okhotsk Sea as driver of millennial-scale changes in North Pacific Intermediate Water ventilation during the last deglaciation. Our records additionally indicate that changes in the δ 13 C intermediate-water (700–1750 m water depth) signature and radiocarbon-derived ventilation ages are in antiphase to those of the deep North Pacific Ocean (>2100 m water depth) during the last glacial termination. Thus, intermediate- and deep-water masses of the northwest Pacific have a differing ventilation history during the last deglaciation. Article in Journal/Newspaper Bering Sea okhotsk sea Directory of Open Access Journals: DOAJ Articles Bering Sea Okhotsk Pacific Climate of the Past 10 2 591 605 |
institution |
Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
spellingShingle |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 L. Max L. Lembke-Jene J.-R. Riethdorf R. Tiedemann D. Nürnberg H. Kühn A. Mackensen Pulses of enhanced North Pacific Intermediate Water ventilation from the Okhotsk Sea and Bering Sea during the last deglaciation |
topic_facet |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
description |
Under modern conditions only North Pacific Intermediate Water is formed in the northwest Pacific Ocean. This situation might have changed in the past. Recent studies with general circulation models indicate a switch to deep-water formation in the northwest Pacific during Heinrich Stadial 1 (17.5–15.0 ka) of the last glacial termination. Reconstructions of past ventilation changes based on paleoceanographic proxy records are still insufficient to test whether a deglacial mode of deep-water formation in the North Pacific Ocean existed. Here we present deglacial ventilation records based on radiocarbon-derived ventilation ages in combination with epibenthic stable carbon isotopes from the northwest Pacific including the Okhotsk Sea and Bering Sea, the two potential source regions for past North Pacific ventilation changes. Evidence for most rigorous ventilation of the intermediate-depth North Pacific occurred during Heinrich Stadial 1 and the Younger Dryas, simultaneous to significant reductions in Atlantic Meridional Overturning Circulation. Concurrent changes in δ 13 C and ventilation ages point to the Okhotsk Sea as driver of millennial-scale changes in North Pacific Intermediate Water ventilation during the last deglaciation. Our records additionally indicate that changes in the δ 13 C intermediate-water (700–1750 m water depth) signature and radiocarbon-derived ventilation ages are in antiphase to those of the deep North Pacific Ocean (>2100 m water depth) during the last glacial termination. Thus, intermediate- and deep-water masses of the northwest Pacific have a differing ventilation history during the last deglaciation. |
format |
Article in Journal/Newspaper |
author |
L. Max L. Lembke-Jene J.-R. Riethdorf R. Tiedemann D. Nürnberg H. Kühn A. Mackensen |
author_facet |
L. Max L. Lembke-Jene J.-R. Riethdorf R. Tiedemann D. Nürnberg H. Kühn A. Mackensen |
author_sort |
L. Max |
title |
Pulses of enhanced North Pacific Intermediate Water ventilation from the Okhotsk Sea and Bering Sea during the last deglaciation |
title_short |
Pulses of enhanced North Pacific Intermediate Water ventilation from the Okhotsk Sea and Bering Sea during the last deglaciation |
title_full |
Pulses of enhanced North Pacific Intermediate Water ventilation from the Okhotsk Sea and Bering Sea during the last deglaciation |
title_fullStr |
Pulses of enhanced North Pacific Intermediate Water ventilation from the Okhotsk Sea and Bering Sea during the last deglaciation |
title_full_unstemmed |
Pulses of enhanced North Pacific Intermediate Water ventilation from the Okhotsk Sea and Bering Sea during the last deglaciation |
title_sort |
pulses of enhanced north pacific intermediate water ventilation from the okhotsk sea and bering sea during the last deglaciation |
publisher |
Copernicus Publications |
publishDate |
2014 |
url |
https://doi.org/10.5194/cp-10-591-2014 https://doaj.org/article/81403064469f4cb29d007830e9e7fabd |
geographic |
Bering Sea Okhotsk Pacific |
geographic_facet |
Bering Sea Okhotsk Pacific |
genre |
Bering Sea okhotsk sea |
genre_facet |
Bering Sea okhotsk sea |
op_source |
Climate of the Past, Vol 10, Iss 2, Pp 591-605 (2014) |
op_relation |
http://www.clim-past.net/10/591/2014/cp-10-591-2014.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 1814-9324 1814-9332 doi:10.5194/cp-10-591-2014 https://doaj.org/article/81403064469f4cb29d007830e9e7fabd |
op_doi |
https://doi.org/10.5194/cp-10-591-2014 |
container_title |
Climate of the Past |
container_volume |
10 |
container_issue |
2 |
container_start_page |
591 |
op_container_end_page |
605 |
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1766377808385277952 |