The Bering Strait was flooded 10,000 years before the Last Glacial Maximum
The cyclic growth and decay of continental ice sheets can be reconstructed from the history of global sea level. Sea level is relatively well constrained for the Last Glacial Maximum (LGM, 26,500 to 19,000 y ago, 26.5 to 19 ka) and the ensuing deglaciation. However, sea-level estimates for the perio...
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ftpubmed:oai:pubmedcentral.nih.gov:9910591 2023-05-15T13:46:06+02:00 The Bering Strait was flooded 10,000 years before the Last Glacial Maximum Farmer, Jesse R. Pico, Tamara Underwood, Ona M. Cleveland Stout, Rebecca Granger, Julie Cronin, Thomas M. Fripiat, François Martínez-García, Alfredo Haug, Gerald H. Sigman, Daniel M. 2022-12-27 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9910591/ http://www.ncbi.nlm.nih.gov/pubmed/36574665 https://doi.org/10.1073/pnas.2206742119 en eng National Academy of Sciences http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9910591/ http://www.ncbi.nlm.nih.gov/pubmed/36574665 http://dx.doi.org/10.1073/pnas.2206742119 Copyright © 2022 the Author(s). Published by PNAS. https://creativecommons.org/licenses/by-nc-nd/4.0/This open access article is distributed under Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND) (https://creativecommons.org/licenses/by-nc-nd/4.0/) . CC-BY-NC-ND Proc Natl Acad Sci U S A Physical Sciences Text 2022 ftpubmed https://doi.org/10.1073/pnas.2206742119 2023-02-12T02:11:44Z The cyclic growth and decay of continental ice sheets can be reconstructed from the history of global sea level. Sea level is relatively well constrained for the Last Glacial Maximum (LGM, 26,500 to 19,000 y ago, 26.5 to 19 ka) and the ensuing deglaciation. However, sea-level estimates for the period of ice-sheet growth before the LGM vary by > 60 m, an uncertainty comparable to the sea-level equivalent of the contemporary Antarctic Ice Sheet. Here, we constrain sea level prior to the LGM by reconstructing the flooding history of the shallow Bering Strait since 46 ka. Using a geochemical proxy of Pacific nutrient input to the Arctic Ocean, we find that the Bering Strait was flooded from the beginning of our records at 46 ka until [Formula: see text] ka. To match this flooding history, our sea-level model requires an ice history in which over 50% of the LGM’s global peak ice volume grew after 46 ka. This finding implies that global ice volume and climate were not linearly coupled during the last ice age, with implications for the controls on each. Moreover, our results shorten the time window between the opening of the Bering Land Bridge and the arrival of humans in the Americas. Text Antarc* Antarctic Arctic Arctic Ocean Bering Land Bridge Bering Strait Ice Sheet PubMed Central (PMC) Antarctic Arctic Arctic Ocean Bering Strait Pacific Proceedings of the National Academy of Sciences 120 1 |
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English |
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Physical Sciences |
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Physical Sciences Farmer, Jesse R. Pico, Tamara Underwood, Ona M. Cleveland Stout, Rebecca Granger, Julie Cronin, Thomas M. Fripiat, François Martínez-García, Alfredo Haug, Gerald H. Sigman, Daniel M. The Bering Strait was flooded 10,000 years before the Last Glacial Maximum |
topic_facet |
Physical Sciences |
description |
The cyclic growth and decay of continental ice sheets can be reconstructed from the history of global sea level. Sea level is relatively well constrained for the Last Glacial Maximum (LGM, 26,500 to 19,000 y ago, 26.5 to 19 ka) and the ensuing deglaciation. However, sea-level estimates for the period of ice-sheet growth before the LGM vary by > 60 m, an uncertainty comparable to the sea-level equivalent of the contemporary Antarctic Ice Sheet. Here, we constrain sea level prior to the LGM by reconstructing the flooding history of the shallow Bering Strait since 46 ka. Using a geochemical proxy of Pacific nutrient input to the Arctic Ocean, we find that the Bering Strait was flooded from the beginning of our records at 46 ka until [Formula: see text] ka. To match this flooding history, our sea-level model requires an ice history in which over 50% of the LGM’s global peak ice volume grew after 46 ka. This finding implies that global ice volume and climate were not linearly coupled during the last ice age, with implications for the controls on each. Moreover, our results shorten the time window between the opening of the Bering Land Bridge and the arrival of humans in the Americas. |
format |
Text |
author |
Farmer, Jesse R. Pico, Tamara Underwood, Ona M. Cleveland Stout, Rebecca Granger, Julie Cronin, Thomas M. Fripiat, François Martínez-García, Alfredo Haug, Gerald H. Sigman, Daniel M. |
author_facet |
Farmer, Jesse R. Pico, Tamara Underwood, Ona M. Cleveland Stout, Rebecca Granger, Julie Cronin, Thomas M. Fripiat, François Martínez-García, Alfredo Haug, Gerald H. Sigman, Daniel M. |
author_sort |
Farmer, Jesse R. |
title |
The Bering Strait was flooded 10,000 years before the Last Glacial Maximum |
title_short |
The Bering Strait was flooded 10,000 years before the Last Glacial Maximum |
title_full |
The Bering Strait was flooded 10,000 years before the Last Glacial Maximum |
title_fullStr |
The Bering Strait was flooded 10,000 years before the Last Glacial Maximum |
title_full_unstemmed |
The Bering Strait was flooded 10,000 years before the Last Glacial Maximum |
title_sort |
bering strait was flooded 10,000 years before the last glacial maximum |
publisher |
National Academy of Sciences |
publishDate |
2022 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9910591/ http://www.ncbi.nlm.nih.gov/pubmed/36574665 https://doi.org/10.1073/pnas.2206742119 |
geographic |
Antarctic Arctic Arctic Ocean Bering Strait Pacific |
geographic_facet |
Antarctic Arctic Arctic Ocean Bering Strait Pacific |
genre |
Antarc* Antarctic Arctic Arctic Ocean Bering Land Bridge Bering Strait Ice Sheet |
genre_facet |
Antarc* Antarctic Arctic Arctic Ocean Bering Land Bridge Bering Strait Ice Sheet |
op_source |
Proc Natl Acad Sci U S A |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9910591/ http://www.ncbi.nlm.nih.gov/pubmed/36574665 http://dx.doi.org/10.1073/pnas.2206742119 |
op_rights |
Copyright © 2022 the Author(s). Published by PNAS. https://creativecommons.org/licenses/by-nc-nd/4.0/This open access article is distributed under Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND) (https://creativecommons.org/licenses/by-nc-nd/4.0/) . |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1073/pnas.2206742119 |
container_title |
Proceedings of the National Academy of Sciences |
container_volume |
120 |
container_issue |
1 |
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1766236994775547904 |