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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National Academy of Sciences
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ftethz:oai:www.research-collection.ethz.ch:20.500.11850/589649 2023-08-20T04:00:27+02:00 The Bering Strait was flooded 10,000 years before the Last Glacial Maximum Farmer, Jesse R. Pico, Tamara Underwood, Ona M. Stout, Rebecca Cleveland Granger, Julie Cronin, Thomas M. Fripiat, François Martínez-García, Alfredo Haug, Gerald H. Sigman, Daniel M. 2023-01-03 application/application/pdf https://hdl.handle.net/20.500.11850/589649 https://doi.org/10.3929/ethz-b-000589649 en eng National Academy of Sciences info:eu-repo/semantics/altIdentifier/doi/10.1073/pnas.2206742119 info:eu-repo/semantics/altIdentifier/wos/001023658500005 http://hdl.handle.net/20.500.11850/589649 doi:10.3929/ethz-b-000589649 info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-nd/4.0/ Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Proceedings of the National Academy of Sciences of the United States of America, 120 (1) Arctic Ocean Bering Strait sea level foraminifera-bound N isotopes lacial isostatic adjustment info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2023 ftethz https://doi.org/20.500.11850/58964910.3929/ethz-b-00058964910.1073/pnas.2206742119 2023-07-30T23:55:04Z 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. ISSN:0027-8424 ISSN:1091-6490 Article in Journal/Newspaper Antarc* Antarctic Arctic Arctic Ocean Bering Land Bridge Bering Strait Foraminifera* Ice Sheet ETH Zürich Research Collection Antarctic Arctic Arctic Ocean Bering Strait Pacific |
institution |
Open Polar |
collection |
ETH Zürich Research Collection |
op_collection_id |
ftethz |
language |
English |
topic |
Arctic Ocean Bering Strait sea level foraminifera-bound N isotopes lacial isostatic adjustment |
spellingShingle |
Arctic Ocean Bering Strait sea level foraminifera-bound N isotopes lacial isostatic adjustment Farmer, Jesse R. Pico, Tamara Underwood, Ona M. Stout, Rebecca Cleveland 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 |
Arctic Ocean Bering Strait sea level foraminifera-bound N isotopes lacial isostatic adjustment |
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. ISSN:0027-8424 ISSN:1091-6490 |
format |
Article in Journal/Newspaper |
author |
Farmer, Jesse R. Pico, Tamara Underwood, Ona M. Stout, Rebecca Cleveland 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. Stout, Rebecca Cleveland 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 |
2023 |
url |
https://hdl.handle.net/20.500.11850/589649 https://doi.org/10.3929/ethz-b-000589649 |
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 Foraminifera* Ice Sheet |
genre_facet |
Antarc* Antarctic Arctic Arctic Ocean Bering Land Bridge Bering Strait Foraminifera* Ice Sheet |
op_source |
Proceedings of the National Academy of Sciences of the United States of America, 120 (1) |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1073/pnas.2206742119 info:eu-repo/semantics/altIdentifier/wos/001023658500005 http://hdl.handle.net/20.500.11850/589649 doi:10.3929/ethz-b-000589649 |
op_rights |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-nd/4.0/ Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International |
op_doi |
https://doi.org/20.500.11850/58964910.3929/ethz-b-00058964910.1073/pnas.2206742119 |
_version_ |
1774718317470154752 |