noaa-ocean-24550 Gulf of Alaska authigenic and bulk sediment neodymium isotope compositions for the past 22,000 years Du, J.; Haley, B.A.; Mix, A.C. Gulf of Alaska authigenic and bulk sediment neodymium isotope compositions for the past 22,000 years 2018-07-02 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/24550 Investigator J. Du Investigator B.A. Haley Investigator A.C. Mix earth science paleoclimate paleoceanography depth at sample end,null,null,meter,null,paleoceanography,null,null,N,Depth of the bottom of sample interval on the CCSF_A depth scale earth science paleoclimate paleoceanography 143Nd/144Nd,oxide and hydroxide minerals,null,dimensionless,null,paleoceanography,null,multiple collector inductively-coupled plasma mass spectrometry,N,authigenic Fe-Mn oxyhydroxide earth science paleoclimate paleoceanography notes,null,null,null,null,paleoceanography,null,null,C,Site name earth science paleoclimate paleoceanography epsilon neodymium,sediment,two standard deviations,epsilon unit,null,paleoceanography,null,multiple collector inductively-coupled plasma mass spectrometry,N,long term external reproducibility earth science paleoclimate paleoceanography depth at sample start,null,null,meter,null,paleoceanography,null,null,N,Depth of the top of sample interval on the CSF_A depth scale earth science paleoclimate paleoceanography epsilon neodymium,oxide and hydroxide minerals,null,epsilon unit,null,paleoceanography,null,multiple collector inductively-coupled plasma mass spectrometry,N,authigenic Fe-Mn oxyhydroxide earth science paleoclimate paleoceanography 143Nd/144Nd,sediment,null,dimensionless,null,paleoceanography,null,multiple collector inductively-coupled plasma mass spectrometry,N,null earth science paleoclimate paleoceanography depth at sample end,null,null,meter,null,paleoceanography,null,null,N,Depth of the bottom of sample interval on the CSF_A depth scale earth science paleoclimate paleoceanography age,null,68% confidence interval lower bound,calendar year before present,null,paleoceanography,null,null,N,also 16% quantile age; Bchron bayesian age model earth science paleoclimate paleoceanography epsilon neodymium,sediment,null,epsilon unit,null,paleoceanography,null,multiple collector inductively-coupled plasma mass spectrometry,N,null earth science paleoclimate paleoceanography notes,null,null,null,null,paleoceanography,null,null,N,IODP Core number earth science paleoclimate paleoceanography notes,null,null,null,null,paleoceanography,null,null,N,IODP Section number earth science paleoclimate paleoceanography depth at sample end,null,null,meter,null,paleoceanography,null,null,N,Depth of the bottom of sample interval on the CCSF_B depth scale earth science paleoclimate paleoceanography epsilon neodymium,oxide and hydroxide minerals,two standard deviations,epsilon unit,null,paleoceanography,null,multiple collector inductively-coupled plasma mass spectrometry,N,authigenic Fe-Mn oxyhydroxide; long term external reproducibility earth science paleoclimate paleoceanography depth at sample start,null,null,centimeter,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography depth at sample start,null,null,meter,null,paleoceanography,null,null,N,Depth of the top of sample interval on the CCSF_B depth scale earth science paleoclimate paleoceanography age,null,null,calendar year before present,null,paleoceanography,null,null,N,median age; Bchron bayesian age model earth science paleoclimate paleoceanography age,null,68% confidence interval upper bound,calendar year before present,null,paleoceanography,null,null,N,also 84% quantile age; Bchron bayesian age model earth science paleoclimate paleoceanography depth at sample start,null,null,centimeter,null,paleoceanography,null,null,N,Depth of the top of sample interval in a section earth science paleoclimate paleoceanography depth at sample end,null,null,centimeter,null,paleoceanography,null,null,N,Depth of the bottom of sample interval in a section earth science paleoclimate paleoceanography depth at sample start,null,null,meter,null,paleoceanography,null,null,N,Depth of the top of sample interval on the CCSF_A depth scale earth science paleoclimate paleoceanography depth,null,null,centimeter,null,paleoceanography,null,null,N,uncorrected depth in core earth science paleoclimate paleoceanography depth,null,null,centimeter,null,paleoceanography,null,null,N,composite depth earth science paleoclimate paleoceanography notes,null,null,null,null,paleoceanography,null,null,C,IODP Hole number earth science paleoclimate paleoceanography depth,null,null,meter,null,paleoceanography,null,null,N,Depth of the mid point of sample interval on the CCSF_B depth scale earth science paleoclimate paleoceanography depth at sample end,null,null,centimeter,null,paleoceanography,null,null,N,null earth science paleoclimate paleocean radiogenic isotope geoscientificInformation 22165 cal yr BP 142 cal yr BP Complete 58.77 59.6 -144.5 -144.1535 -3703 -682 Ocean Pacific Ocean North Pacific Ocean Gulf Of Alaska EW0408-85JC>LATITUDE 59.555>LONGITUDE -144.1535 Ocean Pacific Ocean North Pacific Ocean Gulf Of Alaska IODP U1419>LATITUDE 59.6>LONGITUDE -144.2 Ocean Pacific Ocean North Pacific Ocean Gulf Of Alaska EW0408-87JC>LATITUDE 58.77>LONGITUDE -144.5 Ocean Pacific Ocean North Pacific Ocean Gulf Of Alaska IODP U1418>LATITUDE 58.8>LONGITUDE -144.5 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

325 Broadway, E/NE31

Boulder CO 80305-3328 USA online ASCII Du, Jianghui; Haley, Brian A.; Mix, Alan C.; Walczak, Maureen H.; Praetorius, Summer K. 2018 Nature Geoscience

During the last deglaciation (19,000–9,000 years ago), atmospheric CO2 increased by about 80 ppm. Understanding the mechanisms responsible for this change is a central theme of palaeoclimatology, relevant for predicting future CO2 transfers in a warming world. Deglacial CO2 rise hypothetically tapped an accumulated deep Pacific carbon reservoir, but the processes remain elusive as they are underconstrained by existing tracers. Here we report high-resolution authigenic neodymium isotope data in North Pacific sediment cores and infer abyssal Pacific overturning weaker than today during the Last Glacial Maximum but intermittently stronger during steps of deglacial CO2 rise. Radiocarbon evidence suggestive of relatively ‘old’ deglacial deep Pacific water is reinterpreted here as an increase in preformed 14C age of subsurface waters sourced near Antarctica, consistent with movement of aged carbon out of the deep ocean and release of CO2 to the atmosphere during the abyssal flushing events. The timing of neodymium isotope changes suggests that deglacial acceleration of Pacific abyssal circulation tracked Southern Hemisphere warming, sea-ice retreat and increase of mean ocean temperature. The inferred magnitude of circulation changes is consistent with deep Pacific flushing as a significant, and perhaps dominant, control of the deglacial rise of atmospheric CO2. STUDY NOTES: Authigenic neodymium isotope records were generated by leaching non-decarbonated bulk sediments. These records were used to reconstruct North Pacific circulation in the last 22,000 years. Bulk sediment neodymium isotopes were measured by complete microwave digestion of bulk sediments. Provided Keywords: neodymium isotopes, Gulf of Alaska, North Pacific, Deglaciation, Ocean Circulation

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/du2018/du2018-ew0408-85tc_jc.txt NOAA Template File; EW0408-85TC/JC Neodymium Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/du2018/du2018-iodp-u1418.txt NOAA Template File; IODP U1418 Neodymium Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/du2018/du2018-iodp-u1419.txt NOAA Template File; IODP U1419 Neodymium Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/du2018/du2018-ew0408-87jc.txt NOAA Template File; EW0408-87JC Neodymium Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11