Lacustrine leaf wax hydrogen isotopes indicate strong regional climate feedbacks in Beringia since the last ice age
The Late-Quaternary climate of Beringia remains unresolved despite the region's role in modulating glacial-interglacial climate and as the likely conduit for human dispersal into the Americas. Here, we investigate Beringian temperature change using an similar to 32,000-year lacustrine record of...
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Online Access: | https://doi.org/10.1016/j.quascirev.2021.107130 |
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ftncar:oai:drupal-site.org:articles_24713 2024-04-28T08:08:31+00:00 Lacustrine leaf wax hydrogen isotopes indicate strong regional climate feedbacks in Beringia since the last ice age Daniels, W.C. (author) Russell, J.M. (author) Morrill, C. (author) Longo, W.M. (author) Giblin, A.E. (author) Holland-Stergar, P. (author) Welker, J.M. (author) Wen, X. (author) Hu, Aixue (author) Huang, Y. (author) 2021-10 https://doi.org/10.1016/j.quascirev.2021.107130 en eng Quaternary Science Reviews--Quaternary Science Reviews--02773791 articles:24713 doi:10.1016/j.quascirev.2021.107130 ark:/85065/d7fx7dx6 Copyright 2021 Elsevier. article Text 2021 ftncar https://doi.org/10.1016/j.quascirev.2021.107130 2024-04-04T17:34:52Z The Late-Quaternary climate of Beringia remains unresolved despite the region's role in modulating glacial-interglacial climate and as the likely conduit for human dispersal into the Americas. Here, we investigate Beringian temperature change using an similar to 32,000-year lacustrine record of leaf wax hydrogen isotope ratios (delta H-2(wax)) from Arctic Alaska. Based on Monte Carlo iterations accounting for multiple sources of uncertainty, the reconstructed summertime temperatures were similar to 3 degrees C colder (range: -8 to +3 degrees C) during the Last Glacial Maximum (LGM; 21-25 ka) than the pre-industrial era (PI; 2-0.1 ka). This ice-age summer cooling is substantially smaller than in other parts of the Arctic, reflecting altered atmospheric circulation and increased continentality which weakened glacial cooling in the region. Deglacial warming was punctuated by abrupt events that are largely synchronous with events seen in Greenland ice cores that originate in the North Atlantic but which are also controlled locally, such as by the opening of the Bering Strait between 13.4 and 11 ka. Our reconstruction, together with climate modeling experiments, indicates that Beringia responds more strongly to North Atlantic freshwater forcing under modern-day, open-Bering Strait conditions than under glacial conditions. Furthermore, a 2 degrees C increase (Monte Carlo range: -1 to +5 degrees C) over the anthropogenic era reverses a 6 degrees C decline (Monte Carlo range: -10 to 0 degrees C) through the Holocene, indicating that recent warming in Arctic Alaska has not surpassed peak Holocene summer warmth. (C) 2021 Elsevier Ltd. All rights reserved. Article in Journal/Newspaper Arctic Bering Strait Greenland Greenland ice cores North Atlantic Alaska Beringia OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Quaternary Science Reviews 269 107130 |
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Open Polar |
collection |
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
op_collection_id |
ftncar |
language |
English |
description |
The Late-Quaternary climate of Beringia remains unresolved despite the region's role in modulating glacial-interglacial climate and as the likely conduit for human dispersal into the Americas. Here, we investigate Beringian temperature change using an similar to 32,000-year lacustrine record of leaf wax hydrogen isotope ratios (delta H-2(wax)) from Arctic Alaska. Based on Monte Carlo iterations accounting for multiple sources of uncertainty, the reconstructed summertime temperatures were similar to 3 degrees C colder (range: -8 to +3 degrees C) during the Last Glacial Maximum (LGM; 21-25 ka) than the pre-industrial era (PI; 2-0.1 ka). This ice-age summer cooling is substantially smaller than in other parts of the Arctic, reflecting altered atmospheric circulation and increased continentality which weakened glacial cooling in the region. Deglacial warming was punctuated by abrupt events that are largely synchronous with events seen in Greenland ice cores that originate in the North Atlantic but which are also controlled locally, such as by the opening of the Bering Strait between 13.4 and 11 ka. Our reconstruction, together with climate modeling experiments, indicates that Beringia responds more strongly to North Atlantic freshwater forcing under modern-day, open-Bering Strait conditions than under glacial conditions. Furthermore, a 2 degrees C increase (Monte Carlo range: -1 to +5 degrees C) over the anthropogenic era reverses a 6 degrees C decline (Monte Carlo range: -10 to 0 degrees C) through the Holocene, indicating that recent warming in Arctic Alaska has not surpassed peak Holocene summer warmth. (C) 2021 Elsevier Ltd. All rights reserved. |
author2 |
Daniels, W.C. (author) Russell, J.M. (author) Morrill, C. (author) Longo, W.M. (author) Giblin, A.E. (author) Holland-Stergar, P. (author) Welker, J.M. (author) Wen, X. (author) Hu, Aixue (author) Huang, Y. (author) |
format |
Article in Journal/Newspaper |
title |
Lacustrine leaf wax hydrogen isotopes indicate strong regional climate feedbacks in Beringia since the last ice age |
spellingShingle |
Lacustrine leaf wax hydrogen isotopes indicate strong regional climate feedbacks in Beringia since the last ice age |
title_short |
Lacustrine leaf wax hydrogen isotopes indicate strong regional climate feedbacks in Beringia since the last ice age |
title_full |
Lacustrine leaf wax hydrogen isotopes indicate strong regional climate feedbacks in Beringia since the last ice age |
title_fullStr |
Lacustrine leaf wax hydrogen isotopes indicate strong regional climate feedbacks in Beringia since the last ice age |
title_full_unstemmed |
Lacustrine leaf wax hydrogen isotopes indicate strong regional climate feedbacks in Beringia since the last ice age |
title_sort |
lacustrine leaf wax hydrogen isotopes indicate strong regional climate feedbacks in beringia since the last ice age |
publishDate |
2021 |
url |
https://doi.org/10.1016/j.quascirev.2021.107130 |
genre |
Arctic Bering Strait Greenland Greenland ice cores North Atlantic Alaska Beringia |
genre_facet |
Arctic Bering Strait Greenland Greenland ice cores North Atlantic Alaska Beringia |
op_relation |
Quaternary Science Reviews--Quaternary Science Reviews--02773791 articles:24713 doi:10.1016/j.quascirev.2021.107130 ark:/85065/d7fx7dx6 |
op_rights |
Copyright 2021 Elsevier. |
op_doi |
https://doi.org/10.1016/j.quascirev.2021.107130 |
container_title |
Quaternary Science Reviews |
container_volume |
269 |
container_start_page |
107130 |
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1797577276629450752 |