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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ftosti:oai:osti.gov:1626037 2023-07-30T04:05:25+02:00 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 2023-07-03 application/pdf http://www.osti.gov/servlets/purl/1626037 https://www.osti.gov/biblio/1626037 https://doi.org/10.1126/sciadv.aay2915 unknown http://www.osti.gov/servlets/purl/1626037 https://www.osti.gov/biblio/1626037 https://doi.org/10.1126/sciadv.aay2915 doi:10.1126/sciadv.aay2915 54 ENVIRONMENTAL SCIENCES 2023 ftosti https://doi.org/10.1126/sciadv.aay2915 2023-07-11T09:42:29Z 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. Other/Unknown Material North Atlantic SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Pacific Science Advances 6 9 |
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SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
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54 ENVIRONMENTAL SCIENCES 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 |
topic_facet |
54 ENVIRONMENTAL SCIENCES |
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. |
author |
Praetorius, Summer K. Condron, Alan Mix, Alan C. Walczak, Maureen H. McKay, Jennifer L. Du, Jianghui |
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 |
publishDate |
2023 |
url |
http://www.osti.gov/servlets/purl/1626037 https://www.osti.gov/biblio/1626037 https://doi.org/10.1126/sciadv.aay2915 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
http://www.osti.gov/servlets/purl/1626037 https://www.osti.gov/biblio/1626037 https://doi.org/10.1126/sciadv.aay2915 doi:10.1126/sciadv.aay2915 |
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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1772817304735711232 |