noaa-ocean-24790 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. Beaufort Sea Foraminiferal d18O and d13C Data around the Younger Dryas 2018-07-27 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/24790 Investigator L.D. Keigwin Investigator S. Klotsko Investigator N. Zhao Investigator B. Reilly Investigator L. Giosan Investigator N.W. Driscoll 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 oxygen isotopes earth science paleoclimate paleocean carbon isotopes geoscientificInformation Complete 70.58255 72.144417 -155.368483 -135.135483 -401 -373 Ocean Arctic Ocean Beaufort Sea HLY1302 JPC15/27>LATITUDE 71.105>LONGITUDE -135.147 Ocean Arctic Ocean Beaufort Sea HLY1302 JPC06>LATITUDE 70.9531>LONGITUDE -145.656817 Ocean Arctic Ocean Beaufort Sea HLY1302 JPC09>LATITUDE 70.58255>LONGITUDE -142.417 Ocean Arctic Ocean Beaufort Sea HLY1302 JPC02>LATITUDE 72.144417>LONGITUDE -155.368483 None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

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Boulder CO 80305-3328 USA online ASCII Keigwin, L.D., S. Klotsko, N. Zhao, B. Reilly, L. Giosan, and N.W. Driscoll 2018 Nature Geoscience 10.1038/s41561-018-0169-6

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

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/keigwin2018-ng/keigwin2018-jpc15_27.txt NOAA Template File; JPC15/27 d18O and d13C Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/keigwin2018-ng/keigwin2018-jpc9.txt NOAA Template File; JPC09 d18O and d13C Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/keigwin2018-ng/keigwin2018-jpc2.txt NOAA Template File; JPC02 d18O and d13C Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/keigwin2018-ng/keigwin2018-jpc6.txt NOAA Template File; JPC06 d18O and d13C Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11