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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ftdatacite:10.7892/boris.130378 2023-05-15T16:27:34+02:00 Decadal-scale progression of the onset of Dansgaard–Oeschger warming events Erhardt, Tobias Capron, Emilie Rasmussen, Sune Olander Schüpbach, Simon Bigler, Matthias Adolphi, Florian Fischer, Hubertus 2019 application/pdf https://dx.doi.org/10.7892/boris.130378 https://boris.unibe.ch/130378/ en eng Copernicus Publications info:eu-repo/semantics/openAccess 530 Physics 550 Earth sciences & geology Text article-journal ScholarlyArticle 2019 ftdatacite https://doi.org/10.7892/boris.130378 2021-11-05T12:55:41Z 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 the progression of environmental changes at the onset of the warming events at annual to multi-annual resolution. Our results show on average a small lead of the changes in both local precipitation and terrestrial dust aerosol concentrations over the change in sea-salt aerosol concentrations and local temperature of approximately one decade. This suggests that, connected to the reinvigoration of the Atlantic meridional overturning circulation and the warming in the North Atlantic, both synoptic and hemispheric atmospheric circulation changes at the onset of the DO warming, affecting both the moisture transport to Greenland and the Asian monsoon systems. Taken at face value, this suggests that a collapse of the sea-ice cover may not have been the initial trigger for the DO warming. Text Greenland Greenland ice core Greenland Ice core Project ice core NGRIP North Atlantic North Greenland North Greenland Ice Core Project Sea ice DataCite Metadata Store (German National Library of Science and Technology) Greenland |
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English |
topic |
530 Physics 550 Earth sciences & geology |
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530 Physics 550 Earth sciences & geology Erhardt, Tobias Capron, Emilie Rasmussen, Sune Olander Schüpbach, Simon Bigler, Matthias Adolphi, Florian Fischer, Hubertus Decadal-scale progression of the onset of Dansgaard–Oeschger warming events |
topic_facet |
530 Physics 550 Earth sciences & geology |
description |
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 the progression of environmental changes at the onset of the warming events at annual to multi-annual resolution. Our results show on average a small lead of the changes in both local precipitation and terrestrial dust aerosol concentrations over the change in sea-salt aerosol concentrations and local temperature of approximately one decade. This suggests that, connected to the reinvigoration of the Atlantic meridional overturning circulation and the warming in the North Atlantic, both synoptic and hemispheric atmospheric circulation changes at the onset of the DO warming, affecting both the moisture transport to Greenland and the Asian monsoon systems. Taken at face value, this suggests that a collapse of the sea-ice cover may not have been the initial trigger for the DO warming. |
format |
Text |
author |
Erhardt, Tobias Capron, Emilie Rasmussen, Sune Olander Schüpbach, Simon Bigler, Matthias Adolphi, Florian Fischer, Hubertus |
author_facet |
Erhardt, Tobias Capron, Emilie Rasmussen, Sune Olander Schüpbach, Simon Bigler, Matthias Adolphi, Florian Fischer, Hubertus |
author_sort |
Erhardt, Tobias |
title |
Decadal-scale progression of the onset of Dansgaard–Oeschger warming events |
title_short |
Decadal-scale progression of the onset of Dansgaard–Oeschger warming events |
title_full |
Decadal-scale progression of the onset of Dansgaard–Oeschger warming events |
title_fullStr |
Decadal-scale progression of the onset of Dansgaard–Oeschger warming events |
title_full_unstemmed |
Decadal-scale progression of the onset of Dansgaard–Oeschger warming events |
title_sort |
decadal-scale progression of the onset of dansgaard–oeschger warming events |
publisher |
Copernicus Publications |
publishDate |
2019 |
url |
https://dx.doi.org/10.7892/boris.130378 https://boris.unibe.ch/130378/ |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Greenland ice core Greenland Ice core Project ice core NGRIP North Atlantic North Greenland North Greenland Ice Core Project Sea ice |
genre_facet |
Greenland Greenland ice core Greenland Ice core Project ice core NGRIP North Atlantic North Greenland North Greenland Ice Core Project Sea ice |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.7892/boris.130378 |
_version_ |
1766016966430031872 |