Rapid reductions and millennial-scale variability in Nordic Seas sea ice cover during abrupt glacial climate changes
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Rapid reductions and millennial-scale variability in Nordic Seas sea ice cover during abrupt glacial climate changes. / Sadatzki, Henrik; Maffezzoli, Niccolo; Dokken, Trond M.; Simon, Margit H.; Berben, Sarah M. P.; Fahl, Kirsten; Kjor, Helle A.; Spolaor, Andrea; Stein, Ruediger; Vallelonga, Paul; Vinther, Bo M.; Jansen, Eystein.
I: Proceedings of the National Academy of Sciences of the United States of America, Bind 117, Nr. 47, 24.11.2020, s. 29478-29486.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Rapid reductions and millennial-scale variability in Nordic Seas sea ice cover during abrupt glacial climate changes
AU - Sadatzki, Henrik
AU - Maffezzoli, Niccolo
AU - Dokken, Trond M.
AU - Simon, Margit H.
AU - Berben, Sarah M. P.
AU - Fahl, Kirsten
AU - Kjor, Helle A.
AU - Spolaor, Andrea
AU - Stein, Ruediger
AU - Vallelonga, Paul
AU - Vinther, Bo M.
AU - Jansen, Eystein
PY - 2020/11/24
Y1 - 2020/11/24
N2 - Constraining the past sea ice variability in the Nordic Seas is critical for a comprehensive understanding of the abrupt DansgaardOeschger (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.
AB - Constraining the past sea ice variability in the Nordic Seas is critical for a comprehensive understanding of the abrupt DansgaardOeschger (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.
KW - sea ice
KW - Nordic Seas
KW - Dansgaard-Oeschger events
KW - abrupt climate change
KW - HIGH-RESOLUTION RECORD
KW - NORTH-ATLANTIC
KW - HALOGEN DEPOSITION
KW - OCEAN CIRCULATION
KW - BIOMARKER
KW - MARINE
KW - RECONSTRUCTIONS
KW - INSTABILITY
KW - CONVECTION
KW - ANOMALIES
U2 - 10.1073/pnas.2005849117
DO - 10.1073/pnas.2005849117
M3 - Journal article
C2 - 33168751
VL - 117
SP - 29478
EP - 29486
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 - 47
ER -
ID: 253650208