FN Archimer Export Format PT J TI The role of Northeast Pacific meltwater events in deglacial climate change BT AF Praetorius, Summer K. Condron, Alan Mix, Alan C. Walczak, Maureen H. McKay, Jennifer L. Du, Jianghui AS 1:1;2:2;3:3;4:3;5:3;6:3; FF 1:;2:;3:;4:;5:;6:; C1 U.S. Geological Survey, Menlo Park, CA, USA Woods Hole Oceanographic Institution, Woods Hole, MA, USA. College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR, USA. C2 US GEOL SURVEY, USA WHOI, USA UNIV OREGON STATE, USA IN DOAJ IF 14.136 TC 42 UR 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 LA English DT Article CR MD 126 / MONA BO Marion Dufresne AB 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. PY 2020 PD FEB SO Science Advances SN 2375-2548 PU American Association for the Advancement of Science (AAAS) VL 6 IS 9 UT 000518999500016 DI 10.1126/sciadv.aay2915 ID 72288 ER EF