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120,000 year record of sea ice in the North Atlantic ArchiMer
Maffezzoli, Niccolò; Vallelonga, Paul; Edwards, Ross; Saiz-lopez, Alfonso; Turetta, Clara; Kjær, Helle Astrid; Barbante, Carlo; Vinther, Bo; Spolaor, Andrea.
Although it has been demonstrated that the speed and magnitude of recent Arctic sea ice decline is unprecedented for the past 1,450 years, few records are available to provide a paleoclimate context for Arctic sea ice extent. Here we present a 120 kyr record of bromine enrichment from the RECAP ice core, coastal East Greenland, and reconstruct past sea ice conditions in the North Atlantic as far north as the entrance of the Arctic Ocean (50–85° N). Bromine enrichment has been previously employed to reconstruct first-year sea ice (FYSI) in the Canadian Arctic over the last glacial cycle. We find that during the last deglaciation, the transition from multi-year sea ice (MYSI) to FYSI started at ∼ 17.6 kyr, synchronous with sea ice reductions observed in the...
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Ano: 2018 URL: https://archimer.ifremer.fr/doc/00504/61580/65511.pdf
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Ice core evidence for decoupling between midlatitude atmospheric water cycle and Greenland temperature during the last deglaciation ArchiMer
Landais, Amaelle; Capron, Emilie; Masson-delmotte, Valerie; Toucanne, Samuel; Rhodes, Rachael; Popp, Trevor; Vinther, Bo; Minster, Benedicte; Prie, Frederic.
The last deglaciation represents the most recent example of natural global warming associated with largescale climate changes. In addition to the long-term global temperature increase, the last deglaciation onset is punctuated by a sequence of abrupt changes in the Northern Hemisphere. Such interplay between orbital-and millennial-scale variability is widely documented in paleoclimatic records but the underlying mechanisms are not fully understood. Limitations arise from the difficulty in constraining the sequence of events between external forcing, high-and low-latitude climate, and environmental changes. Greenland ice cores provide sub-decadal-scale records across the last deglaciation and contain fingerprints of climate variations occurring in different...
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Ano: 2018 URL: https://archimer.ifremer.fr/doc/00462/57349/59446.pdf
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