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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Online Access: | https://hdl.handle.net/10278/5013401 https://doi.org/10.1073/pnas.2203468119 |
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ftuniveneziairis:oai:iris.unive.it:10278/5013401 2024-04-21T07:57:38+00:00 Sea ice fluctuations in the Baffin Bay and the Labrador Sea during glacial abrupt climate changes Scoto, Federico Sadatzki, Henrik Maffezzoli, Niccolò Barbante, Carlo Gagliardi, Alessandro Varin, Cristiano Vallelonga, Paul Gkinis, Vasileios Dahl-Jensen, Dorthe Kjær, Helle Astrid Burgay, François Saiz-Lopez, Alfonso Stein, Ruediger Spolaor, Andrea Scoto, Federico Sadatzki, Henrik Maffezzoli, Niccolò Barbante, Carlo Gagliardi, Alessandro Varin, Cristiano Vallelonga, Paul Gkinis, Vasileio Dahl-Jensen, Dorthe Kjær, Helle Astrid Burgay, Françoi Saiz-Lopez, Alfonso Stein, Ruediger Spolaor, Andrea 2022 https://hdl.handle.net/10278/5013401 https://doi.org/10.1073/pnas.2203468119 eng eng info:eu-repo/semantics/altIdentifier/pmid/36279448 info:eu-repo/semantics/altIdentifier/wos/WOS:000892368900019 volume:119 issue:44 journal:PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA info:eu-repo/grantAgreement/EC/FP7/243908, 610055 https://hdl.handle.net/10278/5013401 doi:10.1073/pnas.2203468119 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85140561832 info:eu-repo/semantics/closedAccess Baffin Bay Dansgaard-Oeschger event Labrador Sea abrupt climate change sea ice reconstruction Settore CHIM/01 - Chimica Analitica info:eu-repo/semantics/article 2022 ftuniveneziairis https://doi.org/10.1073/pnas.2203468119 2024-03-28T01:22:06Z 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 Greenland Greenland ice cores ice core Labrador Sea Nordic Seas North Atlantic Sea ice Università Ca’ Foscari Venezia: ARCA (Archivio Istituzionale della Ricerca) Proceedings of the National Academy of Sciences 119 44 |
institution |
Open Polar |
collection |
Università Ca’ Foscari Venezia: ARCA (Archivio Istituzionale della Ricerca) |
op_collection_id |
ftuniveneziairis |
language |
English |
topic |
Baffin Bay Dansgaard-Oeschger event Labrador Sea abrupt climate change sea ice reconstruction Settore CHIM/01 - Chimica Analitica |
spellingShingle |
Baffin Bay Dansgaard-Oeschger event Labrador Sea abrupt climate change sea ice reconstruction Settore CHIM/01 - Chimica Analitica Scoto, Federico Sadatzki, Henrik Maffezzoli, Niccolò Barbante, Carlo Gagliardi, Alessandro Varin, Cristiano Vallelonga, Paul Gkinis, Vasileios Dahl-Jensen, Dorthe Kjær, Helle Astrid Burgay, François 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 |
Baffin Bay Dansgaard-Oeschger event Labrador Sea abrupt climate change sea ice reconstruction Settore CHIM/01 - Chimica Analitica |
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. |
author2 |
Scoto, Federico Sadatzki, Henrik Maffezzoli, Niccolò Barbante, Carlo Gagliardi, Alessandro Varin, Cristiano Vallelonga, Paul Gkinis, Vasileio Dahl-Jensen, Dorthe Kjær, Helle Astrid Burgay, Françoi Saiz-Lopez, Alfonso Stein, Ruediger Spolaor, Andrea |
format |
Article in Journal/Newspaper |
author |
Scoto, Federico Sadatzki, Henrik Maffezzoli, Niccolò Barbante, Carlo Gagliardi, Alessandro Varin, Cristiano Vallelonga, Paul Gkinis, Vasileios Dahl-Jensen, Dorthe Kjær, Helle Astrid Burgay, François Saiz-Lopez, Alfonso Stein, Ruediger Spolaor, Andrea |
author_facet |
Scoto, Federico Sadatzki, Henrik Maffezzoli, Niccolò Barbante, Carlo Gagliardi, Alessandro Varin, Cristiano Vallelonga, Paul Gkinis, Vasileios Dahl-Jensen, Dorthe Kjær, Helle Astrid Burgay, François 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://hdl.handle.net/10278/5013401 https://doi.org/10.1073/pnas.2203468119 |
genre |
Baffin Bay Baffin Bay Baffin Greenland Greenland ice cores ice core Labrador Sea Nordic Seas North Atlantic Sea ice |
genre_facet |
Baffin Bay Baffin Bay Baffin Greenland Greenland ice cores ice core Labrador Sea Nordic Seas North Atlantic Sea ice |
op_relation |
info:eu-repo/semantics/altIdentifier/pmid/36279448 info:eu-repo/semantics/altIdentifier/wos/WOS:000892368900019 volume:119 issue:44 journal:PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA info:eu-repo/grantAgreement/EC/FP7/243908, 610055 https://hdl.handle.net/10278/5013401 doi:10.1073/pnas.2203468119 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85140561832 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1073/pnas.2203468119 |
container_title |
Proceedings of the National Academy of Sciences |
container_volume |
119 |
container_issue |
44 |
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1796939200078020608 |