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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Online Access: | https://doi.org/10.5194/cp-10-591-2014 https://cp.copernicus.org/articles/10/591/2014/ |
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fttriple:oai:gotriple.eu:k26IV-KxGqiJhiOOX9N9O 2023-05-15T15:43:35+02:00 Pulses of enhanced North Pacific Intermediate Water ventilation from the Okhotsk Sea and Bering Sea during the last deglaciation Max, L. Lembke-Jene, L. Riethdorf, J.-R. Tiedemann, R. Nürnberg, D. Kühn, H. Mackensen, A. 2018-09-27 https://doi.org/10.5194/cp-10-591-2014 https://cp.copernicus.org/articles/10/591/2014/ en eng Copernicus Publications doi:10.5194/cp-10-591-2014 10670/1.2zgybc 1814-9324 1814-9332 https://cp.copernicus.org/articles/10/591/2014/ undefined Geographica Helvetica - geography eISSN: 1814-9332 envir geo Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2018 fttriple https://doi.org/10.5194/cp-10-591-2014 2023-01-22T17:34:26Z 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 δ13C 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 δ13C 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 Unknown Bering Sea Okhotsk Pacific Climate of the Past 10 2 591 605 |
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envir geo Max, L. Lembke-Jene, L. Riethdorf, J.-R. Tiedemann, R. Nürnberg, D. Kühn, H. Mackensen, A. Pulses of enhanced North Pacific Intermediate Water ventilation from the Okhotsk Sea and Bering Sea during the last deglaciation |
topic_facet |
envir geo |
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 δ13C 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 δ13C 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 |
Max, L. Lembke-Jene, L. Riethdorf, J.-R. Tiedemann, R. Nürnberg, D. Kühn, H. Mackensen, A. |
author_facet |
Max, L. Lembke-Jene, L. Riethdorf, J.-R. Tiedemann, R. Nürnberg, D. Kühn, H. Mackensen, A. |
author_sort |
Max, L. |
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 |
2018 |
url |
https://doi.org/10.5194/cp-10-591-2014 https://cp.copernicus.org/articles/10/591/2014/ |
geographic |
Bering Sea Okhotsk Pacific |
geographic_facet |
Bering Sea Okhotsk Pacific |
genre |
Bering Sea okhotsk sea |
genre_facet |
Bering Sea okhotsk sea |
op_source |
Geographica Helvetica - geography eISSN: 1814-9332 |
op_relation |
doi:10.5194/cp-10-591-2014 10670/1.2zgybc 1814-9324 1814-9332 https://cp.copernicus.org/articles/10/591/2014/ |
op_rights |
undefined |
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 |
_version_ |
1766377766996934656 |