# Beaufort Sea Foraminiferal d18O and d13C Data around the Younger Dryas
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#               World Data Service for Paleoclimatology, Boulder
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#                      NOAA Paleoclimatology Program
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# Template Version 3.0
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# 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.
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# Description/Documentation lines begin with #
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# 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-jpc6.txt
#      Description: NOAA location of the template
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# Archive: Paleoceanography
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# Dataset_DOI:
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# Parameter_Keywords: oxygen isotopes, carbon isotopes
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# Contribution_Date
#    Date: 2018-07-30
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# File_Last_Modified_Date
#    Date: 2018-07-30
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# Title
#    Study_Name: Beaufort Sea Foraminiferal d18O and d13C Data around the Younger Dryas
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# Investigators
#      Investigators: Keigwin, Lloyd D.; Klotsko, Shannon; Zhao, Ning; Reilly, Brendan; Giosan, L.; Driscoll, Neal W.
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# Description_Notes_and_Keywords
#        Description: 
#         Provided Keywords: North Atlantic Oscillation, radiocarbon dating, foraminifera, oxygen isotopes
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# 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
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# DOI: 10.1038/s41561-018-0169-6
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# 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.
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# Funding_Agency
#    Funding_Agency_Name: National Science Foundation
#    Grant: ARC1204045
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# Site_Information
# Site_Name: HLY1302 JPC06
# Location: Beaufort Sea
# Country: 
# Northernmost_Latitude: 70.9531
# Southernmost_Latitude: 70.9531
# Easternmost_Longitude: -145.656817
# Westernmost_Longitude: -145.656817
# Elevation: -373
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# Data_Collection
#   Collection_Name: JPC6 isotopes Keigwin2018
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# Chronology_Information 
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# 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
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# 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	
1016	-0.350	2.950	
1026	-0.204	3.144	
1036	-0.014	2.921	
1044	-0.009	1.984	
1050	-0.088	1.926	
1064	0.057	2.158	
1070	-0.124	1.609	
1076	-0.064	1.955	
1082	-0.158	2.340