A multicentennial mode of North Atlantic climate variability throughout the Last Glacial Maximum
Paleoclimate proxy records from the North Atlantic region reveal substantially greater multicentennial temperature variability during the Last Glacial Maximum (LGM) compared to the current interglacial. As there was no obvious change in external forcing, causes for the increased variability remain u...
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Online Access: | http://dx.doi.org/10.1126/sciadv.adh1106 https://www.science.org/doi/pdf/10.1126/sciadv.adh1106 |
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craaas:10.1126/sciadv.adh1106 2024-09-30T14:39:13+00:00 A multicentennial mode of North Atlantic climate variability throughout the Last Glacial Maximum Prange, Matthias Jonkers, Lukas Merkel, Ute Schulz, Michael Bakker, Pepijn 2023 http://dx.doi.org/10.1126/sciadv.adh1106 https://www.science.org/doi/pdf/10.1126/sciadv.adh1106 en eng American Association for the Advancement of Science (AAAS) Science Advances volume 9, issue 44 ISSN 2375-2548 journal-article 2023 craaas https://doi.org/10.1126/sciadv.adh1106 2024-09-19T04:00:58Z Paleoclimate proxy records from the North Atlantic region reveal substantially greater multicentennial temperature variability during the Last Glacial Maximum (LGM) compared to the current interglacial. As there was no obvious change in external forcing, causes for the increased variability remain unknown. Exploiting LGM simulations with a comprehensive coupled climate model along with high-resolution proxy records, we introduce an oscillatory mode of multicentennial variability, which is associated with moderate variations in the Atlantic meridional overturning circulation and depends on the large-scale salinity distribution. This self-sustained mode is amplified by sea-ice feedbacks and induces maximum surface temperature variability in the subpolar North Atlantic region. Characterized by a distinct climatic imprint and different dynamics, the multicentennial oscillation has to be distinguished from Dansgaard-Oeschger variability and emerges only under full LGM climate forcing. The potential of multicentennial modes of variability to emerge or disappear in response to changing climate forcing may have implications for future climate change. Article in Journal/Newspaper North Atlantic Sea ice AAAS Resource Center (American Association for the Advancement of Science) Science Advances 9 44 |
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Open Polar |
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AAAS Resource Center (American Association for the Advancement of Science) |
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English |
description |
Paleoclimate proxy records from the North Atlantic region reveal substantially greater multicentennial temperature variability during the Last Glacial Maximum (LGM) compared to the current interglacial. As there was no obvious change in external forcing, causes for the increased variability remain unknown. Exploiting LGM simulations with a comprehensive coupled climate model along with high-resolution proxy records, we introduce an oscillatory mode of multicentennial variability, which is associated with moderate variations in the Atlantic meridional overturning circulation and depends on the large-scale salinity distribution. This self-sustained mode is amplified by sea-ice feedbacks and induces maximum surface temperature variability in the subpolar North Atlantic region. Characterized by a distinct climatic imprint and different dynamics, the multicentennial oscillation has to be distinguished from Dansgaard-Oeschger variability and emerges only under full LGM climate forcing. The potential of multicentennial modes of variability to emerge or disappear in response to changing climate forcing may have implications for future climate change. |
format |
Article in Journal/Newspaper |
author |
Prange, Matthias Jonkers, Lukas Merkel, Ute Schulz, Michael Bakker, Pepijn |
spellingShingle |
Prange, Matthias Jonkers, Lukas Merkel, Ute Schulz, Michael Bakker, Pepijn A multicentennial mode of North Atlantic climate variability throughout the Last Glacial Maximum |
author_facet |
Prange, Matthias Jonkers, Lukas Merkel, Ute Schulz, Michael Bakker, Pepijn |
author_sort |
Prange, Matthias |
title |
A multicentennial mode of North Atlantic climate variability throughout the Last Glacial Maximum |
title_short |
A multicentennial mode of North Atlantic climate variability throughout the Last Glacial Maximum |
title_full |
A multicentennial mode of North Atlantic climate variability throughout the Last Glacial Maximum |
title_fullStr |
A multicentennial mode of North Atlantic climate variability throughout the Last Glacial Maximum |
title_full_unstemmed |
A multicentennial mode of North Atlantic climate variability throughout the Last Glacial Maximum |
title_sort |
multicentennial mode of north atlantic climate variability throughout the last glacial maximum |
publisher |
American Association for the Advancement of Science (AAAS) |
publishDate |
2023 |
url |
http://dx.doi.org/10.1126/sciadv.adh1106 https://www.science.org/doi/pdf/10.1126/sciadv.adh1106 |
genre |
North Atlantic Sea ice |
genre_facet |
North Atlantic Sea ice |
op_source |
Science Advances volume 9, issue 44 ISSN 2375-2548 |
op_doi |
https://doi.org/10.1126/sciadv.adh1106 |
container_title |
Science Advances |
container_volume |
9 |
container_issue |
44 |
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1811641742730985472 |