Tropical North Atlantic Nd Isotopic Ratio Data over the last 22,000 Years Xie, R.C.; Marcantonio, F.; Schmidt, M.W. Xie, R.C. Marcantonio, F. Schmidt, M.W. 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 (KNR166-2-26JPC>LATITUDE 24.326833>LONGITUDE -83.252333) (VM12-107>LATITUDE 11.33>LONGITUDE -66.63) 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. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Xie, R.C. Investigator : Marcantonio, F. Investigator : Schmidt, M.W. 2014-10-27 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/17373 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/xie2014/xie2014-26jpc.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/xie2014/xie2014-vm12-107.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/xie2014/xie2014-26jpc.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/xie2014/xie2014-vm12-107.txt English https://www.ncdc.noaa.gov/paleo/study/17373 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/xie2014/xie2014-26jpc.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/xie2014/xie2014-vm12-107.txt Xie, R.C., F. Marcantonio, and M.W. Schmidt2014Reconstruction of intermediate water circulation in the tropical North Atlantic during the past 22,000 yearsGeochimica et Cosmochimica Acta140455-46710.1016/j.gca.2014.05.041 START YEAR: 22500 cal yr BP * END YEAR: 500 cal yr BP -83.252333 11.33 -66.63 24.326833