Sea ice fluctuations in the Baffin Bay and the Labrador Sea during glacial abrupt climate changes

Research output: Contribution to journal › Journal article › Research › peer-review

Standard

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.

In: Proceedings of the National Academy of Sciences of the United States of America, Vol. 119, No. 44, 2203468119, 01.11.2022.

Research output: Contribution to journal › Journal article › Research › peer-review

Harvard

Scoto, F, Sadatzki, H, Maffezzoli, N, Barbante, C, Gagliardi, A, Varin, C, Vallelonga, P, Gkinis, V, Dahl-Jensen, D, Kjaer, HA, 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

APA

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, 119(44), [2203468119]. https://doi.org/10.1073/pnas.2203468119

Vancouver

Scoto F, Sadatzki H, Maffezzoli N, Barbante C, Gagliardi A, Varin C et al. 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. 2022 Nov 1;119(44). 2203468119. https://doi.org/10.1073/pnas.2203468119

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. / Sea ice fluctuations in the Baffin Bay and the Labrador Sea during glacial abrupt climate changes. In: Proceedings of the National Academy of Sciences of the United States of America. 2022 ; Vol. 119, No. 44.

Bibtex

@article{e0cc8595659c48a08fa5dbbbb040ad7f,
title = "Sea ice fluctuations in the Baffin Bay and the Labrador Sea during glacial abrupt climate changes",
abstract = "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.",
keywords = "sea ice reconstruction, Baffin Bay, Labrador Sea, abrupt climate changes, Dansgaard-Oeschger events, NORTH-ATLANTIC, GREENLAND, RECORD, RECONSTRUCTION, TEMPERATURE, CIRCULATION, MARINE, INFORMATION, INSTABILITY, SEASONALITY",
author = "Federico Scoto and Henrik Sadatzki and Niccolo Maffezzoli and Carlo Barbante and Alessandro Gagliardi and Cristiano Varin and Paul Vallelonga and Vasileios Gkinis and Dorthe Dahl-Jensen and Kjaer, {Helle Astrid} and Francois Burgay and Alfonso Saiz-Lopez and Ruediger Stein and Andrea Spolaor",
year = "2022",
month = nov,
day = "1",
doi = "10.1073/pnas.2203468119",
language = "English",
volume = "119",
journal = "Proceedings of the National Academy of Sciences of the United States of America",
issn = "0027-8424",
publisher = "The National Academy of Sciences of the United States of America",
number = "44",

}

RIS

TY - JOUR

T1 - Sea ice fluctuations in the Baffin Bay and the Labrador Sea during glacial abrupt climate changes

AU - Scoto, Federico

AU - Sadatzki, Henrik

AU - Maffezzoli, Niccolo

AU - Barbante, Carlo

AU - Gagliardi, Alessandro

AU - Varin, Cristiano

AU - Vallelonga, Paul

AU - Gkinis, Vasileios

AU - Dahl-Jensen, Dorthe

AU - Kjaer, Helle Astrid

AU - Burgay, Francois

AU - Saiz-Lopez, Alfonso

AU - Stein, Ruediger

AU - Spolaor, Andrea

PY - 2022/11/1

Y1 - 2022/11/1

N2 - 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.

AB - 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.

KW - sea ice reconstruction

KW - Baffin Bay

KW - Labrador Sea

KW - abrupt climate changes

KW - Dansgaard-Oeschger events

KW - NORTH-ATLANTIC

KW - GREENLAND

KW - RECORD

KW - RECONSTRUCTION

KW - TEMPERATURE

KW - CIRCULATION

KW - MARINE

KW - INFORMATION

KW - INSTABILITY

KW - SEASONALITY

U2 - 10.1073/pnas.2203468119

DO - 10.1073/pnas.2203468119

M3 - Journal article

C2 - 36279448

VL - 119

JO - Proceedings of the National Academy of Sciences of the United States of America

JF - Proceedings of the National Academy of Sciences of the United States of America

SN - 0027-8424

IS - 44

M1 - 2203468119

ER -

ID: 329244618