Age determination and model of sediment core RAPiD-15-4P
Greenland ice core records indicate that the last deglaciation (~7-21 ka) was punctuated by numerous abrupt climate reversals involving temperature changes of up to 5°C-10°C within decades. However, the cause behind many of these events is uncertain. A likely candidate may have been the input of deg...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.831613 2023-05-15T16:30:14+02:00 Age determination and model of sediment core RAPiD-15-4P Thornalley, David JR McCave, I Nick Elderfield, Henry LATITUDE: 62.293000 * LONGITUDE: -17.134000 2010-04-09 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.831613 https://doi.org/10.1594/PANGAEA.831613 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.831613 https://doi.org/10.1594/PANGAEA.831613 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Thornalley, David JR; McCave, I Nick; Elderfield, Henry (2010): Freshwater input and abrupt deglacial climate change in the North Atlantic. Paleoceanography, 25(1), PA1201, https://doi.org/10.1029/2009PA001772 CD159 CD159-15 Charles Darwin PC Piston corer RAPiD-15-4P South of Iceland Dataset 2010 ftpangaea https://doi.org/10.1594/PANGAEA.831613 https://doi.org/10.1029/2009PA001772 2023-01-20T07:33:16Z Greenland ice core records indicate that the last deglaciation (~7-21 ka) was punctuated by numerous abrupt climate reversals involving temperature changes of up to 5°C-10°C within decades. However, the cause behind many of these events is uncertain. A likely candidate may have been the input of deglacial meltwater, from the Laurentide ice sheet (LIS), to the high-latitude North Atlantic, which disrupted ocean circulation and triggered cooling. Yet the direct evidence of meltwater input for many of these events has so far remained undetected. In this study, we use the geochemistry (paired Mg/Ca-d18O) of planktonic foraminifera from a sediment core south of Iceland to reconstruct the input of freshwater to the northern North Atlantic during abrupt deglacial climate change. Our record can be placed on the same timescale as ice cores and therefore provides a direct comparison between the timing of freshwater input and climate variability. Meltwater events coincide with the onset of numerous cold intervals, including the Older Dryas (14.0 ka), two events during the Allerød (at ~13.1 and 13.6 ka), the Younger Dryas (12.9 ka), and the 8.2 ka event, supporting a causal link between these abrupt climate changes and meltwater input. During the Bølling-Allerød warm interval, we find that periods of warming are associated with an increased meltwater flux to the northern North Atlantic, which in turn induces abrupt cooling, a cessation in meltwater input, and eventual climate recovery. This implies that feedback between climate and meltwater input produced a highly variable climate. A comparison to published data sets suggests that this feedback likely included fluctuations in the southern margin of the LIS causing rerouting of LIS meltwater between southern and eastern drainage outlets, as proposed by Clark et al. (2001, doi:10.1126/science.1062517). Dataset Greenland Greenland ice core ice core Ice Sheet Iceland North Atlantic Planktonic foraminifera PANGAEA - Data Publisher for Earth & Environmental Science Greenland ENVELOPE(-17.134000,-17.134000,62.293000,62.293000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
CD159 CD159-15 Charles Darwin PC Piston corer RAPiD-15-4P South of Iceland |
spellingShingle |
CD159 CD159-15 Charles Darwin PC Piston corer RAPiD-15-4P South of Iceland Thornalley, David JR McCave, I Nick Elderfield, Henry Age determination and model of sediment core RAPiD-15-4P |
topic_facet |
CD159 CD159-15 Charles Darwin PC Piston corer RAPiD-15-4P South of Iceland |
description |
Greenland ice core records indicate that the last deglaciation (~7-21 ka) was punctuated by numerous abrupt climate reversals involving temperature changes of up to 5°C-10°C within decades. However, the cause behind many of these events is uncertain. A likely candidate may have been the input of deglacial meltwater, from the Laurentide ice sheet (LIS), to the high-latitude North Atlantic, which disrupted ocean circulation and triggered cooling. Yet the direct evidence of meltwater input for many of these events has so far remained undetected. In this study, we use the geochemistry (paired Mg/Ca-d18O) of planktonic foraminifera from a sediment core south of Iceland to reconstruct the input of freshwater to the northern North Atlantic during abrupt deglacial climate change. Our record can be placed on the same timescale as ice cores and therefore provides a direct comparison between the timing of freshwater input and climate variability. Meltwater events coincide with the onset of numerous cold intervals, including the Older Dryas (14.0 ka), two events during the Allerød (at ~13.1 and 13.6 ka), the Younger Dryas (12.9 ka), and the 8.2 ka event, supporting a causal link between these abrupt climate changes and meltwater input. During the Bølling-Allerød warm interval, we find that periods of warming are associated with an increased meltwater flux to the northern North Atlantic, which in turn induces abrupt cooling, a cessation in meltwater input, and eventual climate recovery. This implies that feedback between climate and meltwater input produced a highly variable climate. A comparison to published data sets suggests that this feedback likely included fluctuations in the southern margin of the LIS causing rerouting of LIS meltwater between southern and eastern drainage outlets, as proposed by Clark et al. (2001, doi:10.1126/science.1062517). |
format |
Dataset |
author |
Thornalley, David JR McCave, I Nick Elderfield, Henry |
author_facet |
Thornalley, David JR McCave, I Nick Elderfield, Henry |
author_sort |
Thornalley, David JR |
title |
Age determination and model of sediment core RAPiD-15-4P |
title_short |
Age determination and model of sediment core RAPiD-15-4P |
title_full |
Age determination and model of sediment core RAPiD-15-4P |
title_fullStr |
Age determination and model of sediment core RAPiD-15-4P |
title_full_unstemmed |
Age determination and model of sediment core RAPiD-15-4P |
title_sort |
age determination and model of sediment core rapid-15-4p |
publisher |
PANGAEA |
publishDate |
2010 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.831613 https://doi.org/10.1594/PANGAEA.831613 |
op_coverage |
LATITUDE: 62.293000 * LONGITUDE: -17.134000 |
long_lat |
ENVELOPE(-17.134000,-17.134000,62.293000,62.293000) |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Greenland ice core ice core Ice Sheet Iceland North Atlantic Planktonic foraminifera |
genre_facet |
Greenland Greenland ice core ice core Ice Sheet Iceland North Atlantic Planktonic foraminifera |
op_source |
Supplement to: Thornalley, David JR; McCave, I Nick; Elderfield, Henry (2010): Freshwater input and abrupt deglacial climate change in the North Atlantic. Paleoceanography, 25(1), PA1201, https://doi.org/10.1029/2009PA001772 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.831613 https://doi.org/10.1594/PANGAEA.831613 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.831613 https://doi.org/10.1029/2009PA001772 |
_version_ |
1766019948801425408 |