Decadal-scale progression of the onset of Dansgaard–Oeschger warming events ...

During the last glacial period, proxy records throughout the Northern Hemisphere document a succession of rapid millennial-scale warming events, called Dansgaard–Oeschger (DO) events. A range of different mechanisms has been proposed that can produce similar warming in model experiments; however, th...

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Bibliographic Details
Main Authors: Erhardt, Tobias, Capron, Emilie, Rasmussen, Sune Olander, Schüpbach, Simon, Bigler, Matthias, Adolphi, Florian, Fischer, Hubertus
Format: Text
Language:English
Published: Copernicus Publications 2019
Subjects:
530 Physics
550 Earth sciences & geology
Greenland
Greenland ice core
Greenland Ice core Project
ice core
NGRIP
North Atlantic
North Greenland
North Greenland Ice Core Project
Sea ice
Online Access:https://dx.doi.org/10.7892/boris.130378
https://boris.unibe.ch/130378/
Description
Summary:During the last glacial period, proxy records throughout the Northern Hemisphere document a succession of rapid millennial-scale warming events, called Dansgaard–Oeschger (DO) events. A range of different mechanisms has been proposed that can produce similar warming in model experiments; however, the progression and ultimate trigger of the events are still unknown. Because of their fast nature, the progression is challenging to reconstruct from paleoclimate data due to the limited temporal resolution achievable in many archives and cross-dating uncertainties between records. Here, we use new high-resolution multi-proxy records of sea-salt (derived from sea spray and sea ice over the North Atlantic) and terrestrial (derived from the central Asian deserts) aerosol concentrations over the period 10–60 ka from the North Greenland Ice Core Project (NGRIP) and North Greenland Eemian Ice Drilling (NEEM) ice cores in conjunction with local precipitation and temperature proxies from the NGRIP ice core to investigate ...

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