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Sea level fingerprinting of the Bering Strait flooding history detects the source of the Younger Dryas climate event
During the Last Glacial Maximum, expansive continental ice sheets lowered globally averaged sea level ~130 m, exposing a land bridge at the Bering Strait. During the subsequent deglaciation, sea level rose rapidly and ultimately flooded the Bering Strait, linking the Arctic and Pacific Oceans. Obser...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Association for the Advancement of Science
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7043918/ https://www.ncbi.nlm.nih.gov/pubmed/32133400 http://dx.doi.org/10.1126/sciadv.aay2935 |
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author | Pico, T. Mitrovica, J. X. Mix, A. C. |
author_facet | Pico, T. Mitrovica, J. X. Mix, A. C. |
author_sort | Pico, T. |
collection | PubMed |
description | During the Last Glacial Maximum, expansive continental ice sheets lowered globally averaged sea level ~130 m, exposing a land bridge at the Bering Strait. During the subsequent deglaciation, sea level rose rapidly and ultimately flooded the Bering Strait, linking the Arctic and Pacific Oceans. Observational records of the Bering Strait flooding have suggested two apparently contradictory scenarios for the timing of the reconnection. We reconcile these enigmatic datasets using gravitationally self-consistent sea-level simulations that vary the timing and geometry of ice retreat between the Laurentide and Cordilleran Ice Sheets to the southwest of the Bering Strait to fit observations of a two-phased flooding history. Assuming the datasets are robust, we demonstrate that their reconciliation requires a substantial melting of the Cordilleran and western Laurentide Ice Sheet from 13,000 to 11,500 years ago. This timing provides a freshwater source for the widely debated Younger Dryas cold episode (12,900 to 11,700 years ago). |
format | Online Article Text |
id | pubmed-7043918 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | American Association for the Advancement of Science |
record_format | MEDLINE/PubMed |
spelling | pubmed-70439182020-03-04 Sea level fingerprinting of the Bering Strait flooding history detects the source of the Younger Dryas climate event Pico, T. Mitrovica, J. X. Mix, A. C. Sci Adv Research Articles During the Last Glacial Maximum, expansive continental ice sheets lowered globally averaged sea level ~130 m, exposing a land bridge at the Bering Strait. During the subsequent deglaciation, sea level rose rapidly and ultimately flooded the Bering Strait, linking the Arctic and Pacific Oceans. Observational records of the Bering Strait flooding have suggested two apparently contradictory scenarios for the timing of the reconnection. We reconcile these enigmatic datasets using gravitationally self-consistent sea-level simulations that vary the timing and geometry of ice retreat between the Laurentide and Cordilleran Ice Sheets to the southwest of the Bering Strait to fit observations of a two-phased flooding history. Assuming the datasets are robust, we demonstrate that their reconciliation requires a substantial melting of the Cordilleran and western Laurentide Ice Sheet from 13,000 to 11,500 years ago. This timing provides a freshwater source for the widely debated Younger Dryas cold episode (12,900 to 11,700 years ago). American Association for the Advancement of Science 2020-02-26 /pmc/articles/PMC7043918/ /pubmed/32133400 http://dx.doi.org/10.1126/sciadv.aay2935 Text en Copyright © 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution License 4.0 (CC BY). http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Research Articles Pico, T. Mitrovica, J. X. Mix, A. C. Sea level fingerprinting of the Bering Strait flooding history detects the source of the Younger Dryas climate event |
title | Sea level fingerprinting of the Bering Strait flooding history detects the source of the Younger Dryas climate event |
title_full | Sea level fingerprinting of the Bering Strait flooding history detects the source of the Younger Dryas climate event |
title_fullStr | Sea level fingerprinting of the Bering Strait flooding history detects the source of the Younger Dryas climate event |
title_full_unstemmed | Sea level fingerprinting of the Bering Strait flooding history detects the source of the Younger Dryas climate event |
title_short | Sea level fingerprinting of the Bering Strait flooding history detects the source of the Younger Dryas climate event |
title_sort | sea level fingerprinting of the bering strait flooding history detects the source of the younger dryas climate event |
topic | Research Articles |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7043918/ https://www.ncbi.nlm.nih.gov/pubmed/32133400 http://dx.doi.org/10.1126/sciadv.aay2935 |
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