Eurasian Ice Sheet collapse was a major source of Meltwater Pulse 1A 14,600 years ago
Rapid sea-level rise caused by the collapse of large ice sheets is a threat to human societies. In the last deglacial period, the rate of global sea-level rise peaked at more than 4 cm yr−1 during Meltwater Pulse 1A, which coincided with the Bølling warming event some 14,650 years ago. However, the...
Published in: | Nature Geoscience |
---|---|
Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Nature
2020
|
Subjects: | |
Online Access: | https://hdl.handle.net/11250/2755925 https://doi.org/10.1038/s41561-020-0567-4 |
id |
ftunivbergen:oai:bora.uib.no:11250/2755925 |
---|---|
record_format |
openpolar |
spelling |
ftunivbergen:oai:bora.uib.no:11250/2755925 2023-05-15T15:07:55+02:00 Eurasian Ice Sheet collapse was a major source of Meltwater Pulse 1A 14,600 years ago Brendryen, Jo Haflidason, Haflidi Yokoyama, Yusuke Haaga, Kristian Agasøster Hannisdal, Bjarte 2020 application/pdf https://hdl.handle.net/11250/2755925 https://doi.org/10.1038/s41561-020-0567-4 eng eng Nature https://rdcu.be/cddpj Trond Mohn stiftelse: Earth System Interactions and Information Transfer Andre: JSPS KAKENHI 17H01168 and 15KK0151 Norges forskningsråd: 221999 Norges forskningsråd: 231259 urn:issn:1752-0894 https://hdl.handle.net/11250/2755925 https://doi.org/10.1038/s41561-020-0567-4 cristin:1817898 Nature Geoscience. 2020, 13, 363–368 Copyright 2020 The Authors Nature Geoscience 13 363-368 Journal article Peer reviewed 2020 ftunivbergen https://doi.org/10.1038/s41561-020-0567-4 2023-03-14T17:39:31Z Rapid sea-level rise caused by the collapse of large ice sheets is a threat to human societies. In the last deglacial period, the rate of global sea-level rise peaked at more than 4 cm yr−1 during Meltwater Pulse 1A, which coincided with the Bølling warming event some 14,650 years ago. However, the sources of the meltwater have proven elusive, and the contribution from Eurasian ice sheets has been considered negligible. Here, we present a regional carbon-14 calibration curve for the Norwegian Sea and recalibrate marine 14C dates linked to the Eurasian Ice Sheet retreat. We find that marine-based sectors of the Eurasian Ice Sheet collapsed at the Bølling transition and lost an ice volume of 4.5–7.9 m sea-level equivalents (SLE) over 500 years. During peak melting, 3.3–6.7 m SLE of ice was lost, potentially explaining up to half of Meltwater Pulse 1A. A mean meltwater flux of 0.2 Sv over 300 years was injected into the Norwegian Sea and the Arctic Ocean at a time when proxy evidence suggests vigorous Atlantic meridional overturning circulation. Our reconstruction shows that massive marine-based ice sheets can collapse in as little as 300–500 years. acceptedVersion Article in Journal/Newspaper Arctic Arctic Ocean Ice Sheet Norwegian Sea University of Bergen: Bergen Open Research Archive (BORA-UiB) Arctic Arctic Ocean Norwegian Sea Nature Geoscience 13 5 363 368 |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
description |
Rapid sea-level rise caused by the collapse of large ice sheets is a threat to human societies. In the last deglacial period, the rate of global sea-level rise peaked at more than 4 cm yr−1 during Meltwater Pulse 1A, which coincided with the Bølling warming event some 14,650 years ago. However, the sources of the meltwater have proven elusive, and the contribution from Eurasian ice sheets has been considered negligible. Here, we present a regional carbon-14 calibration curve for the Norwegian Sea and recalibrate marine 14C dates linked to the Eurasian Ice Sheet retreat. We find that marine-based sectors of the Eurasian Ice Sheet collapsed at the Bølling transition and lost an ice volume of 4.5–7.9 m sea-level equivalents (SLE) over 500 years. During peak melting, 3.3–6.7 m SLE of ice was lost, potentially explaining up to half of Meltwater Pulse 1A. A mean meltwater flux of 0.2 Sv over 300 years was injected into the Norwegian Sea and the Arctic Ocean at a time when proxy evidence suggests vigorous Atlantic meridional overturning circulation. Our reconstruction shows that massive marine-based ice sheets can collapse in as little as 300–500 years. acceptedVersion |
format |
Article in Journal/Newspaper |
author |
Brendryen, Jo Haflidason, Haflidi Yokoyama, Yusuke Haaga, Kristian Agasøster Hannisdal, Bjarte |
spellingShingle |
Brendryen, Jo Haflidason, Haflidi Yokoyama, Yusuke Haaga, Kristian Agasøster Hannisdal, Bjarte Eurasian Ice Sheet collapse was a major source of Meltwater Pulse 1A 14,600 years ago |
author_facet |
Brendryen, Jo Haflidason, Haflidi Yokoyama, Yusuke Haaga, Kristian Agasøster Hannisdal, Bjarte |
author_sort |
Brendryen, Jo |
title |
Eurasian Ice Sheet collapse was a major source of Meltwater Pulse 1A 14,600 years ago |
title_short |
Eurasian Ice Sheet collapse was a major source of Meltwater Pulse 1A 14,600 years ago |
title_full |
Eurasian Ice Sheet collapse was a major source of Meltwater Pulse 1A 14,600 years ago |
title_fullStr |
Eurasian Ice Sheet collapse was a major source of Meltwater Pulse 1A 14,600 years ago |
title_full_unstemmed |
Eurasian Ice Sheet collapse was a major source of Meltwater Pulse 1A 14,600 years ago |
title_sort |
eurasian ice sheet collapse was a major source of meltwater pulse 1a 14,600 years ago |
publisher |
Nature |
publishDate |
2020 |
url |
https://hdl.handle.net/11250/2755925 https://doi.org/10.1038/s41561-020-0567-4 |
geographic |
Arctic Arctic Ocean Norwegian Sea |
geographic_facet |
Arctic Arctic Ocean Norwegian Sea |
genre |
Arctic Arctic Ocean Ice Sheet Norwegian Sea |
genre_facet |
Arctic Arctic Ocean Ice Sheet Norwegian Sea |
op_source |
Nature Geoscience 13 363-368 |
op_relation |
https://rdcu.be/cddpj Trond Mohn stiftelse: Earth System Interactions and Information Transfer Andre: JSPS KAKENHI 17H01168 and 15KK0151 Norges forskningsråd: 221999 Norges forskningsråd: 231259 urn:issn:1752-0894 https://hdl.handle.net/11250/2755925 https://doi.org/10.1038/s41561-020-0567-4 cristin:1817898 Nature Geoscience. 2020, 13, 363–368 |
op_rights |
Copyright 2020 The Authors |
op_doi |
https://doi.org/10.1038/s41561-020-0567-4 |
container_title |
Nature Geoscience |
container_volume |
13 |
container_issue |
5 |
container_start_page |
363 |
op_container_end_page |
368 |
_version_ |
1766339349768568832 |