noaa-ocean-17373 Tropical North Atlantic Nd Isotopic Ratio Data over the last 22,000 Years Xie, R.C.; Marcantonio, F.; Schmidt, M.W. Tropical North Atlantic Nd Isotopic Ratio Data over the last 22,000 Years 2014-10-27 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/17373 Investigator R.C. Xie Investigator F. Marcantonio Investigator M.W. Schmidt earth science paleoclimate paleoceanography age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography 143Nd/144Nd,sediment,null,dimensionless,null,paleoceanography,null,null,N,Fe-Mn oxyhydroxide fraction earth science paleoclimate paleoceanography epsilon neodymium,sediment,null,epsilon unit,null,paleoceanography,null,null,N,detrital sediment earth science paleoclimate paleoceanography epsilon neodymium,sediment,null,epsilon unit,null,paleoceanography,null,null,N,Fe-Mn oxyhydroxide fraction earth science paleoclimate paleoceanography 143Nd/144Nd,fish,null,dimensionless,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography 143Nd/144Nd,sediment,two standard deviations,dimensionless,null,paleoceanography,null,null,N,Fe-Mn oxyhydroxide fraction earth science paleoclimate paleoceanography 143Nd/144Nd,fish,two standard deviations,dimensionless,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography epsilon neodymium,sediment,one standard deviation,epsilon unit,null,paleoceanography,null,null,N,Fe-Mn oxyhydroxide fraction earth science paleoclimate paleoceanography 143Nd/144Nd,sediment,null,dimensionless,null,paleoceanography,null,null,N,detrital sediment earth science paleoclimate paleoceanography 143Nd/144Nd,sediment,two standard deviations,dimensionless,null,paleoceanography,null,null,N,detrital sediment earth science paleoclimate paleoceanography epsilon neodymium,sediment,one standard deviation,epsilon unit,null,paleoceanography,null,null,N,detrital sediment earth science paleoclimate paleoceanography depth,null,null,centimeter,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography epsilon neodymium,fish,null,epsilon unit,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography epsilon neodymium,fish,one standard deviation,epsilon unit,null,paleoceanography,null,null,N,null earth science paleoclimate paleocean geochemistry geoscientificInformation 22500 cal yr BP 500 cal yr BP Complete 11.33 24.326833 -83.252333 -66.63 -1079 -546 Ocean Atlantic Ocean North Atlantic Ocean Gulf Of Mexico KNR166-2-26JPC>LATITUDE 24.326833>LONGITUDE -83.252333 Ocean Atlantic Ocean North Atlantic Ocean Caribbean Sea VM12-107>LATITUDE 11.33>LONGITUDE -66.63 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 Xie, R.C., F. Marcantonio, and M.W. Schmidt 2014 Geochimica et Cosmochimica Acta 140 455-467 10.1016/j.gca.2014.05.041

Decades of paleoceanographic studies have reconstructed a well-resolved water mass structure for the deep Atlantic Ocean during the Last Glacial Maximum (LGM). However, the variability of intermediate water circulation in the tropics over the LGM and deglacial abrupt climate events is still largely debated. This study aims to reconstruct intermediate northern- and southern-sourced water circulation in the tropical North Atlantic during the past 22 kyr and attempts to confine the boundary between Antarctic Intermediate Water (AAIW) and northern-sourced intermediate water (i.e., upper North Atlantic Deep Water (NADW) or Glacial North Atlantic Intermediate Water) in the past. High-resolution Nd isotopic compositions of fish debris and acid-reductive leachate of bulk sediment in core VM12-107 (1079 m depth) from the Southern Caribbean are not in agreement. We suggest that the leachate method does not reliably extract the Nd isotopic compositions of seawater at this location, and that it needs to be tested in more detail in various oceanic settings. The fish debris εNd values display a general decrease from the early deglaciation to the end of the Younger Dryas, followed by a greater drop toward less radiogenic values into the early Holocene. We propose a potentially more radiogenic glacial northern endmember water mass and interpret this pattern as recording a recovery of the upper NADW during the last deglaciation. Comparing our new fish debris Nd isotope data to authigenic Nd isotope studies in the Florida Straits (546 and 751 m depth), we propose that both glacial and deglacial AAIW do not penetrate beyond the lower depth limit of modern AAIW in the tropical Atlantic.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/xie2014/xie2014-26jpc.txt Formatted Text File; KNR166-2-26JPC Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/xie2014/xie2014-vm12-107.txt Formatted Text File; VM12-107 Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11