Anatomy of Heinrich Layer 1 and its role in the last deglaciation

noaa-ocean-24670 North Atlantic Heinrich Layer 1 Geochemical and Stable Isotope Data Hodell, D.A.; Nicholl, J.A.; Bontognali, T.R.R.; Danino, S.; Dorador, J.; Dowdeswell, J.A.; Einsle, J.; Kuhlmann, H.; Martrat, B.; Vautravers, M.J.; Rodríguez-Tovar, F.J.; Röhl, U. North Atlantic Heinrich Layer 1 Geochemical and Stable Isotope Data 2018-07-17 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/24670 Investigator D.A. Hodell Investigator J.A. Nicholl Investigator T.R.R. Bontognali Investigator S. Danino Investigator J. Dorador Investigator J.A. Dowdeswell Investigator J. Einsle Investigator H. Kuhlmann Investigator B. Martrat Investigator M.J. Vautravers Investigator F.J. Rodríguez-Tovar Investigator U. Röhl earth science paleoclimate paleoceanography sample identification,null,null,null,null,paleoceanography,null,null,C,Section earth science paleoclimate paleoceanography mineral index,sediment,null,percent,null,paleoceanography,null,x-ray diffraction,N,dolomite + ankerite earth science paleoclimate paleoceanography depth,null,null,millimeter,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography silicon,sediment,chi-square,dimensionless,null,paleoceanography,null,energy-dispersive x-ray fluorescence spectroscopy,N,null earth science paleoclimate paleoceanography lead,sediment,null,peak area integral,null,paleoceanography,null,energy-dispersive x-ray fluorescence spectroscopy,N,null earth science paleoclimate paleoceanography identified foraminifer,sediment,null,count,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography organism index,sediment,null,count,null,paleoceanography,null,null,N,benthic including ostracods earth 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present,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography ice rafted debris,sediment,null,percent,null,paleoceanography,null,null,N,Counts of grains >1-mm in size from CT earth science paleoclimate paleoceanography Globigerina bulloides,sediment,null,count,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography identified foraminifer,sediment,null,count,null,paleoceanography,null,null,N,T. quinqueloba earth science paleoclimate paleoceanography total planktic foraminifers,sediment,null,percent,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography delta 13C,benthic foraminifer,null,per mil,null,paleoceanography,null,isotope ratio mass spectrometry,N,null earth science paleoclimate paleoceanography delta 18O,sediment,null,per mil,null,paleoceanography,null,isotope ratio mass spectrometry,N,null earth science paleoclimate paleoceanography bismuth,sediment,chi-square,dimensionless,null,paleoceanography,null,energy-dispersive x-ray fluorescence spectroscopy,N,null earth science paleoclimate paleoceanography ankerite,sediment,null,percent,null,paleoceanography,null,x-ray diffraction,N,null earth science paleoclimate paleoceanography depth at sample end,null,null,meter,null,paleoceanography,null,null,N,Top Interval earth science paleoclimate paleoceanography calcium,sediment,chi-square,dimensionless,null,paleoceanography,null,energy-dispersive x-ray fluorescence spectroscopy,N,null earth science paleoclimate paleoceanography total radiolarians,sediment,null,count,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography ice rafted debris,sediment,null,count,null,paleoceanography,null,null,N,other IRD earth science paleoclimate paleoceanography delta 18O,benthic foraminifer,null,per mil,null,paleoceanography,null,isotope ratio mass spectrometry,N,null earth science paleoclimate paleoceanography delta 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bromine,sediment,chi-square,dimensionless,null,paleoceanography,null,energy-dispersive x-ray fluorescence spectroscopy,N,null earth science paleoclimate paleoceanography delta 13C,sediment,null,per mil,null,paleoceanography,null,isotope ratio mass spectrometry,N,null earth science paleoclimate paleoceanography delta 18O,sediment,null,per mil,null,paleoceanography,null,isotope ratio mass spectrometry,N,replicate earth science paleoclimate paleoceanography age,null,null,calendar year before present,null,paleoceanography,null,null,N,Bacon Chronology earth science paleoclimate paleoceanography ice rafted debris,sediment,null,count,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography foraminiferal index,sediment,null,count,null,paleoceanography,null,null,N,Forams (non-Pachy) earth science paleoclimate paleoceanography ice rafted debris,sediment,null,count,null,paleoceanography,null,null,N,total lithics earth science paleoclimate paleoceanography delta 13C,Neogloboquadrina pachyderma,null,per mil,null,paleoceanography,null,isotope ratio mass spectrometry,N,replicate earth science paleoclimate paleoceanography sample identification,null,null,null,null,paleoceanography,null,null,C,Type earth science paleoclimate paleoceanography notes,null,null,null,null,paleoceanography,null,null,C,species earth science paleoclimate paleoceanography depth at sample start,null,null,meter,null,paleoceanography,null,null,N,bottom Interval earth science paleoclimate paleoceanography age,null,null,calendar year before present,null,paleoceanography,null,null,N,median earth science paleoclimate paleoceanography aragonite,sediment,null,percent,null,paleoceanography,null,x-ray diffraction,N,null earth science paleoclimate paleoceanography silicon,sediment,null,peak area integral,null,paleoceanography,null,energy-dispersive x-ray fluorescence spectroscopy,N,null earth science paleoclimate paleoceanography sulfur,sediment,null,peak area integral,null,paleoceanography,null,energy-dispersive x-ray fluorescence spectroscopy,N,null earth science paleoclimate paleoceanography titanium,sediment,chi-square,dimensionless,null,paleoceanography,null,energy-dispersive x-ray fluorescence spectroscopy,N,null earth science paleoclimate paleoceanography iron,sediment,null,peak area integral,null,paleoceanography,null,energy-dispersive x-ray fluorescence spectroscopy,N,null earth science paleoclimate paleoceanography Globigerinoides ruber,sediment,null,count,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography particles,sediment,null,count,null,paleoceanography,null,null,N,total grains = total lithics + total foraminifers earth science paleoclimate paleoceanography ice rafted debris,sediment,null,percent,null,paleoceanography,null,null,N,detrital carbonate earth science paleoclimate paleoceanography notes,null,null,null,null,paleoceanography,null,null,C,real time earth science paleoclimate paleoceanography titanium,sediment,null,peak area integral,null,paleoceanography,null,energy-dispersive x-ray fluorescence spectroscopy,N,null earth science paleoclimate paleoceanography quartz,sediment,null,percent,null,paleoceanography,null,x-ray diffraction,N,null earth science paleoclimate paleoceanography orthoclase,sediment,null,percent,null,paleoceanography,null,x-ray diffraction,N,null earth science paleoclimate paleoceanography depth,null,null,centimeter,null,paleoceanography,null,null,N,corrected earth science paleoclimate paleoceanography silicon/strontium,sediment,null,dimensionless,null,paleoceanography,null,energy-dispersive x-ray fluorescence spectroscopy,N,null earth science paleoclimate paleoceanography potassium,sediment,null,peak area integral,null,paleoceanography,null,energy-dispersive x-ray fluorescence spectroscopy,N,null earth science paleoclimate paleoceanography iron,sediment,chi-square,dimensionless,null,paleoceanography,null,energy-dispersive x-ray fluorescence spectroscopy,N,null earth science paleoclimate paleoceanography zinc,sediment,null,peak area integral,null,paleoceanography,null,energy-dispersive x-ray fluorescence spectroscopy,N,null earth science paleoclimate paleoceanography strontium,sediment,chi-square,dimensionless,null,paleoceanography,null,energy-dispersive x-ray fluorescence spectroscopy,N,null earth science paleoclimate paleoceanography age,null,null,calendar year before present,null,paleoceanography,null,null,N,median; Bacon Chronology earth science paleoclimate paleoceanography age,null,null,calendar year before present,null,paleoceanography,null,null,N,mean; Bacon Chronology earth science paleoclimate paleoceanography density,sediment,null,gram per cubic centimeter,null,paleoceanography,null,computed tomography,N,total density earth science paleoclimate paleoceanography Globorotalia inflata,sediment,null,count,null,paleoceanography,null,null,N,G. glutinata earth science paleoclimate paleoceanography identified foraminifer,sediment,null,count,null,paleoceanography,null,null,N,G. rubescens earth science paleoclimate paleoceanography Globorotalia truncatulinoides,sediment,null,count,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography foraminifer fragmentation,sediment,null,count,null,paleoceanography,null,null,N,planktic foram fragments earth science paleoclimate paleoceanography ice rafted debris,sediment,null,percent,null,paleoceanography,null,null,N,%IRD to total >150 particles earth science paleoclimate paleoceanography ice rafted debris,sediment,null,percent,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography Neogloboquadrina pachyderma,sediment,null,percent,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,median earth science paleoclimate paleoceanography bismuth,sediment,null,peak area 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integral,null,paleoceanography,null,energy-dispersive x-ray fluorescence spectroscopy,N,null earth science paleoclimate paleoceanography rubidium,sediment,chi-square,dimensionless,null,paleoceanography,null,energy-dispersive x-ray fluorescence spectroscopy,N,null earth science paleoclimate paleoceanography zirconium,sediment,null,peak area integral,null,paleoceanography,null,energy-dispersive x-ray fluorescence spectroscopy,N,null earth science paleoclimate paleoceanography zirconium,sediment,chi-square,dimensionless,null,paleoceanography,null,energy-dispersive x-ray fluorescence spectroscopy,N,null earth science paleoclimate paleoceanography molybdenum,sediment,null,peak area integral,null,paleoceanography,null,energy-dispersive x-ray fluorescence spectroscopy,N,null earth science paleoclimate paleoceanography molybdenum,sediment,chi-square,dimensionless,null,paleoceanography,null,energy-dispersive x-ray fluorescence spectroscopy,N,null earth science paleoclimate paleoceanography identified foraminifer,sediment,null,count,null,paleoceanography,null,null,N,G. scitula earth science paleoclimate paleoceanography identified foraminifer,sediment,null,count,null,paleoceanography,null,null,N,H. aequilateralis earth science paleoclimate paleoceanography identified foraminifer,sediment,null,count,null,paleoceanography,null,null,N,B. digitata earth science paleoclimate paleoceanography total planktic foraminifers,sediment,null,count,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography foraminiferal index,sediment,null,count,null,paleoceanography,null,null,N,other temperate species % in PF earth science paleoclimate paleoceanography ice rafted debris,sediment,null,count,null,paleoceanography,null,null,N,detrital carbonate earth science paleoclimate paleoceanography delta 18O,Neogloboquadrina pachyderma,null,per mil,null,paleoceanography,null,isotope ratio mass spectrometry,N,null earth science paleoclimate paleoceanography notes,null,null,null,null,paleoceanography,null,null,C,measurement date earth science paleoclimate paleoceanography dolomite,sediment,null,percent,null,paleoceanography,null,x-ray diffraction,N,null earth science paleoclimate paleoceanography albite,sediment,null,percent,null,paleoceanography,null,x-ray diffraction,N,null earth science paleoclimate paleoceanography calcium,sediment,null,peak area integral,null,paleoceanography,null,energy-dispersive x-ray fluorescence spectroscopy,N,null earth science paleoclimate paleoceanography bromine,sediment,null,peak area integral,null,paleoceanography,null,energy-dispersive x-ray fluorescence spectroscopy,N,null earth science paleoclimate paleoceanography strontium,sediment,null,peak area integral,null,paleoceanography,null,energy-dispersive x-ray fluorescence spectroscopy,N,null earth science paleoclimate paleoceanography lead,sediment,chi-square,dimensionless,null,paleoceanography,null,energy-dispersive x-ray fluorescence spectroscopy,N,null earth science paleoclimate paleoceanography density,sediment,null,gram per cubic centimeter,null,paleoceanography,null,computed tomography,N,Low Density Removed earth science paleoclimate paleoceanography identified foraminifer,sediment,null,count,null,paleoceanography,null,null,N,G. falconensis earth science paleoclimate paleoceanography foraminiferal index,sediment,null,percent,null,paleoceanography,null,null,N,% ruber+aeq+orb+rubes+falco+dig earth science paleoclimate paleoceanography Neogloboquadrina pachyderma,sediment,null,count,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,mean earth science paleoclimate paleoceanography delta 13C,Neogloboquadrina pachyderma,null,per mil,null,paleoceanography,null,isotope ratio mass spectrometry,N,null earth science paleoclimate paleoceanography depth,null,null,centimeter,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography chlorine,sediment,null,peak area integral,null,paleoceanography,null,energy-dispersive x-ray fluorescence spectroscopy,N,null earth science paleoclimate paleocean geochemistry earth science paleoclimate paleocean oxygen isotopes earth science paleoclimate paleocean carbon isotopes geoscientificInformation 29854 cal yr BP 9054 cal yr BP Complete 36.2053 49.8778 -24.2383 -4.3133 -3883 -1108 Ocean Atlantic Ocean North Atlantic Ocean U1308>LATITUDE 49.8778>LONGITUDE -24.2383 Ocean Atlantic Ocean North Atlantic Ocean ODP 976>LATITUDE 36.2053>LONGITUDE -4.3133 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 David A. Hodell, Joseph A. Nicholl, Tomaso R.R. Bontognali, Steffan Danino, Javier Dorador, Julian A. Dowdeswell, Joshua Einsle, Holger Kuhlmann, Belen Martrat, Maryline J. Mleneck-Vautravers, Francisco Javier Rodríguez-Tovar, Ursula Röhl 2017 Anatomy of Heinrich Layer 1 and its role in the last deglaciation Paleoceanography and Paleoclimatology 32 3 284-303 10.1002/2016PA003028 https://agupubs.onlinelibrary.wiley.com/doi/10.1002/2016PA003028

X-ray fluorescence (XRF) core scanning and X-ray computed tomography data were measured every 1 mm to study the structure of Heinrich Event 1 during the last deglaciation at International Ocean Discovery Program Site U1308. Heinrich Layer 1 comprises two distinct layers of ice-rafted detritus (IRD), which are rich in detrital carbonate (DC) and poor in foraminifera. Each DC layer consists of poorly sorted, coarse-grained clasts of IRD embedded in a dense, fine-grained matrix of glacial rock flour that is partially cemented. The radiocarbon ages of foraminifera at the base of the two layers indicate a difference of 1400 14C years, suggesting that they are two distinct events, but the calendar ages depend upon assumptions made for surface reservoir ages. The double peak indicates at least two distinct stages of discharge of the ice streams that drained the Laurentide Ice Sheet through Hudson Strait during HE1 or, alternatively, the discharge of two independent ice streams containing detrital carbonate. Heinrich Event 1.1 was the larger of the two events and began at ~16.2 ka (15.5-17.1 ka) when the polar North Atlantic was already cold and Atlantic Meridional Overturning Circulation (AMOC) weakened. The younger peak (H1.2) at ~15.1 ka (14.3 to 15.9 ka) was a weaker event than H1.1 that was accompanied by minor cooling. Our results support a complex history for Heinrich Stadial 1 (HS1) with reduction in AMOC during the early part (~20-16.2 ka) possibly driven by melting of European ice sheets, whereas the Laurentide Ice Sheet assumed a greater role during the latter half (~16.2-14.7 ka). STUDY NOTES: Sediment XRF, IRD, and stable isotope data from North Atlantic core U1308 through Heinrich Layer 1 (~16-14ka)

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2017/hodell2017u1308cxrf.txt NOAA Template File; U1308C Heinrich Layer 1 XRF Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2017/hodell2017u1308age.txt NOAA Template File; U1308 Heinrich Layer 1 Age Model GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2017/hodell2017u1308iso.txt NOAA Template File; U1308 Heinrich Layer 1 Stable Isotope Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2017/hodell2017u1308axrf.txt NOAA Template File; U1308A Heinrich Layer 1 XRF Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2017/hodell2017u1308ird.txt NOAA Template File; U1308 Heinrich Layer 1 IRD Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2017/hodell2017u1308dens.txt NOAA Template File; U1308 Heinrich Layer 1 Density Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2017/hodell2017odp976iso.txt NOAA Template File; ODP976 Heinrich Layer 1 Stable Isotope Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2017/hodell2017u1308bxrf.txt NOAA Template File; U1308B Heinrich Layer 1 XRF Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2017/hodell2017u1308ctird.txt NOAA Template File; U1308 Heinrich Layer 1 CT IRD Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2017/hodell2017u1308foram.txt NOAA Template File; U1308 Heinrich Layer 1 Foram Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2017/hodell2017u1308xrd.txt NOAA Template File; U1308 Heinrich Layer 1 XRD Data USA/NOAA DIF Version 9.8.4 2019-02-12 2019-02-12