Beaufort Sea Foraminiferal d18O and d13C Data around the Younger Dryas Keigwin, L.D.; Klotsko, S.; Zhao, N.; Reilly, B.; Giosan, L.; Driscoll, N.W. Keigwin, L.D. Klotsko, S. Zhao, N. Reilly, B. Giosan, L. Driscoll, N.W. earth science/paleoclimate/paleoceanography (depth,null,null,centimeter,null,paleoceanography,null,null,N,mid point of 1-cm slice down the core) earth science/paleoclimate/paleoceanography (delta 13C,Neogloboquadrina pachyderma sinistral,null,per mil PDB,null,paleoceanography,null,isotope ratio mass spectrometry,N,measured on Prism isotope ratio mass spectrometer NOSAMS) earth science/paleoclimate/paleoceanography (depth,null,null,centimeter,null,paleoceanography,null,null,N,mid point of 1-cm slice down the core; depth at JPC15/27 is a composite as described in Keigwin et al. 2018) earth science/paleoclimate/paleoceanography (notes,null,null,null,null,paleoceanography,null,null,C,core name) earth science/paleoclimate/paleoceanography (delta 18O,Neogloboquadrina pachyderma sinistral,null,per mil PDB,null,paleoceanography,null,isotope ratio mass spectrometry,N,measured on Prism isotope ratio mass spectrometer NOSAMS) earth science/paleoclimate/paleoceanography (delta 18O,benthic foraminifer,null,per mil PDB,null,paleoceanography,null,isotope ratio mass spectrometry,N,Cassidulina neoteretis; measured on Prism isotope ratio mass spectrometer NOSAMS) earth science/paleoclimate/paleoceanography (delta 13C,benthic foraminifer,null,per mil PDB,null,paleoceanography,null,isotope ratio mass spectrometry,N,Cassidulina neoteretis; measured on Prism isotope ratio mass spectrometer NOSAMS) earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean (HLY1302 JPC15/27>LATITUDE 71.105>LONGITUDE -135.147) (HLY1302 JPC06>LATITUDE 70.9531>LONGITUDE -145.656817) (HLY1302 JPC09>LATITUDE 70.58255>LONGITUDE -142.417) (HLY1302 JPC02>LATITUDE 72.144417>LONGITUDE -155.368483) A period of cooling about 13,000 years ago interrupted about 2,000 years of deglacial warming. Known as the Younger Dryas (YD), the event is thought to have resulted from a slowdown of the Atlantic meridional overturning circulation in response to a sudden flood of Laurentide Ice Sheet meltwater that reached the Nordic Seas. Oxygen isotope evidence for a local source of meltwater to the open western North Atlantic from the Gulf of St Lawrence has been lacking. Here we report that the eastern Beaufort Sea contains the long-sought signal of 18O-depleted water. Beginning at ~12.94?±?0.15 thousand years ago, oxygen isotopes in the planktonic foraminifera from two sediment cores as well as sediment and seismic data indicate a flood of meltwater, ice and sediment to the Arctic via the Mackenzie River that lasted about 700 years. The minimum in the oxygen isotope ratios lasted ~130 years. We suggest that the floodwater travelled north along the Canadian Archipelago and then through the Fram Strait to the Nordic Seas, where freshening and freezing near sites of deep-water formation would have suppressed convection and caused the YD cooling by reducing the meridional overturning. STUDY NOTES: Provided Keywords: North Atlantic Oscillation, radiocarbon dating, foraminifera, oxygen isotopes NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Keigwin, L.D. Investigator : Klotsko, S. Investigator : Zhao, N. Investigator : Reilly, B. Investigator : Giosan, L. Investigator : Driscoll, N.W. 2018-07-27 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/24790 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/keigwin2018-ng/keigwin2018-jpc15_27.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/keigwin2018-ng/keigwin2018-jpc9.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/keigwin2018-ng/keigwin2018-jpc2.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/keigwin2018-ng/keigwin2018-jpc6.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/keigwin2018-ng/keigwin2018-jpc15_27.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/keigwin2018-ng/keigwin2018-jpc9.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/keigwin2018-ng/keigwin2018-jpc2.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/keigwin2018-ng/keigwin2018-jpc6.txt English https://www.ncdc.noaa.gov/paleo/study/24790 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/keigwin2018-ng/keigwin2018-jpc15_27.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/keigwin2018-ng/keigwin2018-jpc9.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/keigwin2018-ng/keigwin2018-jpc2.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/keigwin2018-ng/keigwin2018-jpc6.txt Keigwin, L.D., S. Klotsko, N. Zhao, B. Reilly, L. Giosan, and N.W. Driscoll2018Deglacial floods in the Beaufort Sea preceded Younger Dryas coolingNature Geoscience10.1038/s41561-018-0169-6 -155.368483 70.58255 -135.135483 72.144417