Rapid reductions and millennial-scale variability in Nordic Seas sea ice cover during abrupt glacial climate changes.
Dansgaard–Oeschger events
Nordic Seas
abrupt climate change
sea ice
Journal
Proceedings of the National Academy of Sciences of the United States of America
ISSN: 1091-6490
Titre abrégé: Proc Natl Acad Sci U S A
Pays: United States
ID NLM: 7505876
Informations de publication
Date de publication:
24 11 2020
24 11 2020
Historique:
pubmed:
11
11
2020
medline:
11
11
2020
entrez:
10
11
2020
Statut:
ppublish
Résumé
Constraining the past sea ice variability in the Nordic Seas is critical for a comprehensive understanding of the abrupt Dansgaard-Oeschger (D-O) climate changes during the last glacial. Here we present unprecedentedly detailed sea ice proxy evidence from two Norwegian Sea sediment cores and an East Greenland ice core to resolve and constrain sea ice variations during four D-O events between 32 and 41 ka. Our independent sea ice records consistently reveal a millennial-scale variability and threshold response between an extensive seasonal sea ice cover in the Nordic Seas during cold stadials and reduced seasonal sea ice conditions during warmer interstadials. They document substantial and rapid sea ice reductions that may have happened within 250 y or less, concomitant with reinvigoration of deep convection in the Nordic Seas and the abrupt warming transitions in Greenland. Our empirical evidence thus underpins the cardinal role of rapid sea ice decline and related feedbacks to trigger abrupt and large-amplitude climate change of the glacial D-O events.
Identifiants
pubmed: 33168751
pii: 2005849117
doi: 10.1073/pnas.2005849117
pmc: PMC7703592
doi:
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
29478-29486Déclaration de conflit d'intérêts
The authors declare no competing interest.
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