The role of Northeast Pacific meltwater events in deglacial climate change
Columbia River megafloods occurred repeatedly during the last deglaciation, but the impacts of this fresh water on Pacific hydrography are largely unknown. To reconstruct changes in ocean circulation during this period, we used a numerical model to simulate the flow trajectory of Columbia River mega...
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American Association for the Advancement of Science (AAAS)
2020
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Online Access: | https://archimer.ifremer.fr/doc/00611/72288/71102.pdf https://archimer.ifremer.fr/doc/00611/72288/71103.pdf https://archimer.ifremer.fr/doc/00611/72288/71104.xlsx https://archimer.ifremer.fr/doc/00611/72288/71105.xlsx https://archimer.ifremer.fr/doc/00611/72288/71106.xlsx https://archimer.ifremer.fr/doc/00611/72288/71107.xlsx https://doi.org/10.1126/sciadv.aay2915 https://archimer.ifremer.fr/doc/00611/72288/ |
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ftarchimer:oai:archimer.ifremer.fr:72288 2024-01-14T10:09:01+01:00 The role of Northeast Pacific meltwater events in deglacial climate change Praetorius, Summer K. Condron, Alan Mix, Alan C. Walczak, Maureen H. Mckay, Jennifer L. Du, Jianghui 2020-02 application/pdf https://archimer.ifremer.fr/doc/00611/72288/71102.pdf https://archimer.ifremer.fr/doc/00611/72288/71103.pdf https://archimer.ifremer.fr/doc/00611/72288/71104.xlsx https://archimer.ifremer.fr/doc/00611/72288/71105.xlsx https://archimer.ifremer.fr/doc/00611/72288/71106.xlsx https://archimer.ifremer.fr/doc/00611/72288/71107.xlsx https://doi.org/10.1126/sciadv.aay2915 https://archimer.ifremer.fr/doc/00611/72288/ eng eng American Association for the Advancement of Science (AAAS) https://archimer.ifremer.fr/doc/00611/72288/71102.pdf https://archimer.ifremer.fr/doc/00611/72288/71103.pdf https://archimer.ifremer.fr/doc/00611/72288/71104.xlsx https://archimer.ifremer.fr/doc/00611/72288/71105.xlsx https://archimer.ifremer.fr/doc/00611/72288/71106.xlsx https://archimer.ifremer.fr/doc/00611/72288/71107.xlsx doi:10.1126/sciadv.aay2915 https://archimer.ifremer.fr/doc/00611/72288/ info:eu-repo/semantics/openAccess restricted use Science Advances (2375-2548) (American Association for the Advancement of Science (AAAS)), 2020-02 , Vol. 6 , N. 9 , P. eaay2915 ( 18p.) text Article info:eu-repo/semantics/article 2020 ftarchimer https://doi.org/10.1126/sciadv.aay2915 2023-12-19T23:51:09Z Columbia River megafloods occurred repeatedly during the last deglaciation, but the impacts of this fresh water on Pacific hydrography are largely unknown. To reconstruct changes in ocean circulation during this period, we used a numerical model to simulate the flow trajectory of Columbia River megafloods and compiled records of sea surface temperature, paleo-salinity, and deep-water radiocarbon from marine sediment cores in the Northeast Pacific. The North Pacific sea surface cooled and freshened during the early deglacial (19.0-16.5 ka) and Younger Dryas (12.9-11.7 ka) intervals, coincident with the appearance of subsurface water masses depleted in radiocarbon relative to the sea surface. We infer that Pacific meltwater fluxes contributed to net Northern Hemisphere cooling prior to North Atlantic Heinrich Events, and again during the Younger Dryas stadial. Abrupt warming in the Northeast Pacific similarly contributed to hemispheric warming during the Bølling and Holocene transitions. These findings underscore the importance of changes in North Pacific freshwater fluxes and circulation in deglacial climate events. Article in Journal/Newspaper North Atlantic Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Pacific Science Advances 6 9 eaay2915 |
institution |
Open Polar |
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Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
description |
Columbia River megafloods occurred repeatedly during the last deglaciation, but the impacts of this fresh water on Pacific hydrography are largely unknown. To reconstruct changes in ocean circulation during this period, we used a numerical model to simulate the flow trajectory of Columbia River megafloods and compiled records of sea surface temperature, paleo-salinity, and deep-water radiocarbon from marine sediment cores in the Northeast Pacific. The North Pacific sea surface cooled and freshened during the early deglacial (19.0-16.5 ka) and Younger Dryas (12.9-11.7 ka) intervals, coincident with the appearance of subsurface water masses depleted in radiocarbon relative to the sea surface. We infer that Pacific meltwater fluxes contributed to net Northern Hemisphere cooling prior to North Atlantic Heinrich Events, and again during the Younger Dryas stadial. Abrupt warming in the Northeast Pacific similarly contributed to hemispheric warming during the Bølling and Holocene transitions. These findings underscore the importance of changes in North Pacific freshwater fluxes and circulation in deglacial climate events. |
format |
Article in Journal/Newspaper |
author |
Praetorius, Summer K. Condron, Alan Mix, Alan C. Walczak, Maureen H. Mckay, Jennifer L. Du, Jianghui |
spellingShingle |
Praetorius, Summer K. Condron, Alan Mix, Alan C. Walczak, Maureen H. Mckay, Jennifer L. Du, Jianghui The role of Northeast Pacific meltwater events in deglacial climate change |
author_facet |
Praetorius, Summer K. Condron, Alan Mix, Alan C. Walczak, Maureen H. Mckay, Jennifer L. Du, Jianghui |
author_sort |
Praetorius, Summer K. |
title |
The role of Northeast Pacific meltwater events in deglacial climate change |
title_short |
The role of Northeast Pacific meltwater events in deglacial climate change |
title_full |
The role of Northeast Pacific meltwater events in deglacial climate change |
title_fullStr |
The role of Northeast Pacific meltwater events in deglacial climate change |
title_full_unstemmed |
The role of Northeast Pacific meltwater events in deglacial climate change |
title_sort |
role of northeast pacific meltwater events in deglacial climate change |
publisher |
American Association for the Advancement of Science (AAAS) |
publishDate |
2020 |
url |
https://archimer.ifremer.fr/doc/00611/72288/71102.pdf https://archimer.ifremer.fr/doc/00611/72288/71103.pdf https://archimer.ifremer.fr/doc/00611/72288/71104.xlsx https://archimer.ifremer.fr/doc/00611/72288/71105.xlsx https://archimer.ifremer.fr/doc/00611/72288/71106.xlsx https://archimer.ifremer.fr/doc/00611/72288/71107.xlsx https://doi.org/10.1126/sciadv.aay2915 https://archimer.ifremer.fr/doc/00611/72288/ |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Science Advances (2375-2548) (American Association for the Advancement of Science (AAAS)), 2020-02 , Vol. 6 , N. 9 , P. eaay2915 ( 18p.) |
op_relation |
https://archimer.ifremer.fr/doc/00611/72288/71102.pdf https://archimer.ifremer.fr/doc/00611/72288/71103.pdf https://archimer.ifremer.fr/doc/00611/72288/71104.xlsx https://archimer.ifremer.fr/doc/00611/72288/71105.xlsx https://archimer.ifremer.fr/doc/00611/72288/71106.xlsx https://archimer.ifremer.fr/doc/00611/72288/71107.xlsx doi:10.1126/sciadv.aay2915 https://archimer.ifremer.fr/doc/00611/72288/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1126/sciadv.aay2915 |
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Science Advances |
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6 |
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9 |
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