Sea ice fluctuations in the Baffin Bay and the Labrador Sea during glacial abrupt climate changes
Sea ice decline in the North Atlantic and Nordic Seas has been proposed to contribute to the repeated abrupt atmospheric warmings recorded in Greenland ice cores during the last glacial period, known as Dansgaard-Oeschger (D-O) events. However, the understanding of how sea ice changes were coupled w...
Published in: | Proceedings of the National Academy of Sciences |
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Format: | Article in Journal/Newspaper |
Language: | English |
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2022
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Online Access: | https://curis.ku.dk/portal/da/publications/sea-ice-fluctuations-in-the-baffin-bay-and-the-labrador-sea-during-glacial-abrupt-climate-changes(e0cc8595-659c-48a0-8fa5-dbbbb040ad7f).html https://doi.org/10.1073/pnas.2203468119 https://curis.ku.dk/ws/files/329244622/pnas.2203468119.pdf |
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ftcopenhagenunip:oai:pure.atira.dk:publications/e0cc8595-659c-48a0-8fa5-dbbbb040ad7f 2024-06-09T07:44:52+00:00 Sea ice fluctuations in the Baffin Bay and the Labrador Sea during glacial abrupt climate changes Scoto, Federico Sadatzki, Henrik Maffezzoli, Niccolo Barbante, Carlo Gagliardi, Alessandro Varin, Cristiano Vallelonga, Paul Gkinis, Vasileios Dahl-Jensen, Dorthe Kjaer, Helle Astrid Burgay, Francois Saiz-Lopez, Alfonso Stein, Ruediger Spolaor, Andrea 2022-11-01 application/pdf https://curis.ku.dk/portal/da/publications/sea-ice-fluctuations-in-the-baffin-bay-and-the-labrador-sea-during-glacial-abrupt-climate-changes(e0cc8595-659c-48a0-8fa5-dbbbb040ad7f).html https://doi.org/10.1073/pnas.2203468119 https://curis.ku.dk/ws/files/329244622/pnas.2203468119.pdf eng eng info:eu-repo/semantics/openAccess Scoto , F , Sadatzki , H , Maffezzoli , N , Barbante , C , Gagliardi , A , Varin , C , Vallelonga , P , Gkinis , V , Dahl-Jensen , D , Kjaer , H A , Burgay , F , Saiz-Lopez , A , Stein , R & Spolaor , A 2022 , ' Sea ice fluctuations in the Baffin Bay and the Labrador Sea during glacial abrupt climate changes ' , Proceedings of the National Academy of Sciences of the United States of America , vol. 119 , no. 44 , 2203468119 . https://doi.org/10.1073/pnas.2203468119 sea ice reconstruction Baffin Bay Labrador Sea abrupt climate changes Dansgaard-Oeschger events NORTH-ATLANTIC GREENLAND RECORD RECONSTRUCTION TEMPERATURE CIRCULATION MARINE INFORMATION INSTABILITY SEASONALITY article 2022 ftcopenhagenunip https://doi.org/10.1073/pnas.2203468119 2024-05-16T11:29:26Z Sea ice decline in the North Atlantic and Nordic Seas has been proposed to contribute to the repeated abrupt atmospheric warmings recorded in Greenland ice cores during the last glacial period, known as Dansgaard-Oeschger (D-O) events. However, the understanding of how sea ice changes were coupled with abrupt climate changes during D-O events has remained incomplete due to a lack of suitable high-resolution sea ice proxy records from northwestern North Atlantic regions. Here, we present a subdecadal-scale bromine enrichment (Brenr) record from the NEEM ice core (Northwest Greenland) and sediment core biomarker records to reconstruct the variability of seasonal sea ice in the Baffin Bay and Labrador Sea over a suite of D-O events between 34 and 42 ka. Our results reveal repeated shifts between stable, multiyear sea ice (MYSI) conditions during cold stadials and unstable, seasonal sea ice conditions during warmer interstadials. The shift from stadial to interstadial sea ice conditions occurred rapidly and synchronously with the atmospheric warming over Greenland, while the amplitude of high-frequency sea ice fluctuations increased through interstadials. Our findings suggest that the rapid replacement of widespread MYSI with seasonal sea ice amplified the abrupt climate warming over the course of D-O events and highlight the role of feedbacks associated with late-interstadial seasonal sea ice expansion in driving the North Atlantic ocean-climate system back to stadial conditions. Article in Journal/Newspaper Baffin Bay Baffin Bay Baffin Dansgaard-Oeschger events Greenland Greenland ice cores ice core Labrador Sea Nordic Seas North Atlantic Sea ice University of Copenhagen: Research Baffin Bay Greenland Proceedings of the National Academy of Sciences 119 44 |
institution |
Open Polar |
collection |
University of Copenhagen: Research |
op_collection_id |
ftcopenhagenunip |
language |
English |
topic |
sea ice reconstruction Baffin Bay Labrador Sea abrupt climate changes Dansgaard-Oeschger events NORTH-ATLANTIC GREENLAND RECORD RECONSTRUCTION TEMPERATURE CIRCULATION MARINE INFORMATION INSTABILITY SEASONALITY |
spellingShingle |
sea ice reconstruction Baffin Bay Labrador Sea abrupt climate changes Dansgaard-Oeschger events NORTH-ATLANTIC GREENLAND RECORD RECONSTRUCTION TEMPERATURE CIRCULATION MARINE INFORMATION INSTABILITY SEASONALITY Scoto, Federico Sadatzki, Henrik Maffezzoli, Niccolo Barbante, Carlo Gagliardi, Alessandro Varin, Cristiano Vallelonga, Paul Gkinis, Vasileios Dahl-Jensen, Dorthe Kjaer, Helle Astrid Burgay, Francois Saiz-Lopez, Alfonso Stein, Ruediger Spolaor, Andrea Sea ice fluctuations in the Baffin Bay and the Labrador Sea during glacial abrupt climate changes |
topic_facet |
sea ice reconstruction Baffin Bay Labrador Sea abrupt climate changes Dansgaard-Oeschger events NORTH-ATLANTIC GREENLAND RECORD RECONSTRUCTION TEMPERATURE CIRCULATION MARINE INFORMATION INSTABILITY SEASONALITY |
description |
Sea ice decline in the North Atlantic and Nordic Seas has been proposed to contribute to the repeated abrupt atmospheric warmings recorded in Greenland ice cores during the last glacial period, known as Dansgaard-Oeschger (D-O) events. However, the understanding of how sea ice changes were coupled with abrupt climate changes during D-O events has remained incomplete due to a lack of suitable high-resolution sea ice proxy records from northwestern North Atlantic regions. Here, we present a subdecadal-scale bromine enrichment (Brenr) record from the NEEM ice core (Northwest Greenland) and sediment core biomarker records to reconstruct the variability of seasonal sea ice in the Baffin Bay and Labrador Sea over a suite of D-O events between 34 and 42 ka. Our results reveal repeated shifts between stable, multiyear sea ice (MYSI) conditions during cold stadials and unstable, seasonal sea ice conditions during warmer interstadials. The shift from stadial to interstadial sea ice conditions occurred rapidly and synchronously with the atmospheric warming over Greenland, while the amplitude of high-frequency sea ice fluctuations increased through interstadials. Our findings suggest that the rapid replacement of widespread MYSI with seasonal sea ice amplified the abrupt climate warming over the course of D-O events and highlight the role of feedbacks associated with late-interstadial seasonal sea ice expansion in driving the North Atlantic ocean-climate system back to stadial conditions. |
format |
Article in Journal/Newspaper |
author |
Scoto, Federico Sadatzki, Henrik Maffezzoli, Niccolo Barbante, Carlo Gagliardi, Alessandro Varin, Cristiano Vallelonga, Paul Gkinis, Vasileios Dahl-Jensen, Dorthe Kjaer, Helle Astrid Burgay, Francois Saiz-Lopez, Alfonso Stein, Ruediger Spolaor, Andrea |
author_facet |
Scoto, Federico Sadatzki, Henrik Maffezzoli, Niccolo Barbante, Carlo Gagliardi, Alessandro Varin, Cristiano Vallelonga, Paul Gkinis, Vasileios Dahl-Jensen, Dorthe Kjaer, Helle Astrid Burgay, Francois Saiz-Lopez, Alfonso Stein, Ruediger Spolaor, Andrea |
author_sort |
Scoto, Federico |
title |
Sea ice fluctuations in the Baffin Bay and the Labrador Sea during glacial abrupt climate changes |
title_short |
Sea ice fluctuations in the Baffin Bay and the Labrador Sea during glacial abrupt climate changes |
title_full |
Sea ice fluctuations in the Baffin Bay and the Labrador Sea during glacial abrupt climate changes |
title_fullStr |
Sea ice fluctuations in the Baffin Bay and the Labrador Sea during glacial abrupt climate changes |
title_full_unstemmed |
Sea ice fluctuations in the Baffin Bay and the Labrador Sea during glacial abrupt climate changes |
title_sort |
sea ice fluctuations in the baffin bay and the labrador sea during glacial abrupt climate changes |
publishDate |
2022 |
url |
https://curis.ku.dk/portal/da/publications/sea-ice-fluctuations-in-the-baffin-bay-and-the-labrador-sea-during-glacial-abrupt-climate-changes(e0cc8595-659c-48a0-8fa5-dbbbb040ad7f).html https://doi.org/10.1073/pnas.2203468119 https://curis.ku.dk/ws/files/329244622/pnas.2203468119.pdf |
geographic |
Baffin Bay Greenland |
geographic_facet |
Baffin Bay Greenland |
genre |
Baffin Bay Baffin Bay Baffin Dansgaard-Oeschger events Greenland Greenland ice cores ice core Labrador Sea Nordic Seas North Atlantic Sea ice |
genre_facet |
Baffin Bay Baffin Bay Baffin Dansgaard-Oeschger events Greenland Greenland ice cores ice core Labrador Sea Nordic Seas North Atlantic Sea ice |
op_source |
Scoto , F , Sadatzki , H , Maffezzoli , N , Barbante , C , Gagliardi , A , Varin , C , Vallelonga , P , Gkinis , V , Dahl-Jensen , D , Kjaer , H A , Burgay , F , Saiz-Lopez , A , Stein , R & Spolaor , A 2022 , ' Sea ice fluctuations in the Baffin Bay and the Labrador Sea during glacial abrupt climate changes ' , Proceedings of the National Academy of Sciences of the United States of America , vol. 119 , no. 44 , 2203468119 . https://doi.org/10.1073/pnas.2203468119 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1073/pnas.2203468119 |
container_title |
Proceedings of the National Academy of Sciences |
container_volume |
119 |
container_issue |
44 |
_version_ |
1801373712454254592 |