# Beaufort Sea Foraminiferal d18O and d13C Data around the Younger Dryas #----------------------------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program #----------------------------------------------------------------------- # Template Version 3.0 # Encoding: UTF-8 # NOTE: Please cite original publication, online resource and date accessed when using this data. # If there is no publication information, please cite Investigator, title, online resource and date accessed. # # Description/Documentation lines begin with # # Data lines have no # # # Online_Resource: https://www.ncdc.noaa.gov/paleo/study/24790 # Description: NOAA Landing Page # Online_Resource: http://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/keigwin2018-ng/keigwin2018-jpc2.txt # Description: NOAA location of the template # # Archive: Paleoceanography # # Dataset_DOI: # # Parameter_Keywords: oxygen isotopes, carbon isotopes #--------------------------------------- # Contribution_Date # Date: 2018-07-30 #--------------------------------------- # File_Last_Modified_Date # Date: 2018-07-30 #--------------------------------------- # Title # Study_Name: Beaufort Sea Foraminiferal d18O and d13C Data around the Younger Dryas #--------------------------------------- # Investigators # Investigators: Keigwin, Lloyd D.; Klotsko, Shannon; Zhao, Ning; Reilly, Brendan; Giosan, L.; Driscoll, Neal W. #--------------------------------------- # Description_Notes_and_Keywords # Description: # Provided Keywords: North Atlantic Oscillation, radiocarbon dating, foraminifera, oxygen isotopes #--------------------------------------- # Publication # Authors: Keigwin, L.D., S. Klotsko, N. Zhao, B. Reilly, L. Giosan, and N.W. Driscoll # Published_Date_or_Year: 2018 # Published_Title: Deglacial floods in the Beaufort Sea preceded Younger Dryas cooling # Journal_Name: Nature Geoscience # Volume: # Edition: # Issue: # Pages: # Report_Number: # DOI: 10.1038/s41561-018-0169-6 # Online_Resource: # Full_Citation: # Abstract: 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. #--------------------------------------- # Funding_Agency # Funding_Agency_Name: National Science Foundation # Grant: ARC1204045 #--------------------------------------- # Site_Information # Site_Name: HLY1302 JPC02 # Location: Beaufort Sea # Country: # Northernmost_Latitude: 72.144417 # Southernmost_Latitude: 72.144417 # Easternmost_Longitude: -155.368483 # Westernmost_Longitude: -155.368483 # Elevation: -401 #--------------------------------------- # Data_Collection # Collection_Name: JPC2 isotopes Keigwin2018 # First_Year: # Last_Year: # Time_Unit: # Core_Length: # Notes: #--------------------------------------- # Chronology_Information # Chronology: # #--------------------------------------- # Variables # Data variables follow that are preceded by "##" in columns one and two. # Variables list, one per line, shortname-tab-longname components (9 components: what, material, error, units, seasonality, archive, detail, method, C or N for Character or Numeric data) ## depth depth,sediment,,centimeter,,paleoceanography,,,N,mid point of 1-cm slice down the core ## delta_13C_Nps delta 13C,Neogloboquadrina pachyderma sinistral,,per mil PDB,,paleoceanography,,isotope ratio mass spectrometry,N,measured on Prism isotope ratio mass spectrometer, NOSAMS, Woods Hole ## delta_18O_Nps delta 18O,Neogloboquadrina pachyderma sinistral,,per mil PDB,,paleoceanography,,isotope ratio mass spectrometry,N,measured on Prism isoope ratio mass spectrometer, NOSAMS, Woods Hole # #------------------------ # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing_Values: NaN depth delta_13C_Nps delta_18O_Nps 441 0.238 2.194 481 0.444 2.559 521 0.605 2.120 561 0.449 2.328 601 0.362 2.064 621 0.444 2.395 641 0.391 2.472 701 0.420 2.677 717 0.310 2.288 721 0.488 2.161 737 0.371 2.360 741 0.309 1.918 745 0.373 2.343 761 0.491 2.307 765 0.377 2.085 781 0.215 2.735 842 -0.103 2.664 850 -0.178 2.585 854 -0.181 2.473 858 -0.169 2.468 862 -0.168 2.520 866 -0.221 2.637 921 -0.361 3.578 922 -0.539 3.437