South Atlantic 24,000 Year Neodymium Isotope Data Howe, J.N.W.; Piotrowski, A.; Oppo, D.W.; Huang, K.-F.; Mulitza, S.; Chiessi, C.M.; Blusztajn, J. Howe, J.N.W. Piotrowski, A. Oppo, D.W. Huang, K.-F. Mulitza, S. Chiessi, C.M. Blusztajn, J. Meridional Overturning Circulation (MOC) earth science/paleoclimate/paleoceanography (age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (epsilon neodymium,sediment,two standard deviations,epsilon unit,null,paleoceanography,null,null,N,leachate material) earth science/paleoclimate/paleoceanography (epsilon neodymium,sediment,null,epsilon unit,null,paleoceanography,null,null,N,detrital sediment) earth science/paleoclimate/paleoceanography (epsilon neodymium,sediment,two standard deviations,epsilon unit,null,paleoceanography,null,null,N,detrital sediment) earth science/paleoclimate/paleoceanography (epsilon neodymium,sediment,null,epsilon unit,null,paleoceanography,null,null,N,leachate material) earth science/paleoclimate/paleoceanography (143Nd/144Nd,planktic foraminifer,null,dimensionless,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (epsilon neodymium,planktic foraminifer,null,epsilon unit,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (143Nd/144Nd,sediment,null,dimensionless,null,paleoceanography,null,null,N,detrital sediment) earth science/paleoclimate/paleoceanography (143Nd/144Nd,sediment,null,dimensionless,null,paleoceanography,null,null,N,leachate material) earth science/paleoclimate/paleoceanography (depth,null,null,centimeter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (epsilon neodymium,planktic foraminifer,two standard deviations,epsilon unit,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleocean (GeoB2104-3>LATITUDE -27.3>LONGITUDE -46.4) (GeoB2107-3>LATITUDE -27.18>LONGITUDE -46.45) (KNR159-5-36GGC>LATITUDE -27.5167>LONGITUDE -46.4667) Antarctic Intermediate Water is an essential limb of the Atlantic meridional overturning circulation that redistributes heat and nutrients within the Atlantic Ocean. Existing reconstructions have yielded conflicting results on the history of Antarctic Intermediate Water penetration into the Atlantic across the most recent glacial termination. In this study we present leachate, foraminiferal, and detrital neodymium isotope data from three intermediate-depth cores collected from the southern Brazil margin in the South Atlantic covering the past 25 kyr. These results reveal that strong chemical leaching following decarbonation does not extract past seawater neodymium composition in this location. The new foraminiferal records reveal no changes in seawater Nd isotopes during abrupt Northern Hemisphere cold events at these sites. We therefore conclude that there is no evidence for greater incursion of Antarctic Intermediate Water into the South Atlantic during either the Younger Dryas or Heinrich Stadial 1. We do, however, observe more radiogenic Nd isotope values in the intermediate-depth South Atlantic during the mid-Holocene. This radiogenic excursion coincides with evidence for a southward shift in the Southern Hemisphere westerlies that may have resulted in a greater entrainment of radiogenic Pacific-sourced water during intermediate water production in the Atlantic sector of the Southern Ocean. Our intermediate-depth records show similar values to a deglacial foraminiferal Nd isotope record from the deep South Atlantic during the Younger Dryas but are clearly distinct during the Last Glacial Maximum and Heinrich Stadial 1, demonstrating that the South Atlantic remained chemically stratified during Heinrich Stadial 1. STUDY NOTES: Neodymium isotope (143Nd/144Nd and eNd) data from three South Atlantic sediment cores. For all three cores, measurements on uncleaned planktonic foraminifera are provided. For GEOB2107-3 and GEOB2104-3, measurements on leachates are also provided. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Howe, J.N.W. Investigator : Piotrowski, A. Investigator : Oppo, D.W. Investigator : Huang, K.-F. Investigator : Mulitza, S. Investigator : Chiessi, C.M. Investigator : Blusztajn, J. 2016-10-27 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/20673 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/howe2016/howe2016knr159-5-36ggc.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/howe2016/howe2016geob2107-3.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/howe2016/howe2016geob2104-3.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/howe2016/howe2016knr159-5-36ggc.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/howe2016/howe2016geob2107-3.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/howe2016/howe2016geob2104-3.txt English https://www.ncdc.noaa.gov/paleo/study/20673 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/howe2016/howe2016knr159-5-36ggc.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/howe2016/howe2016geob2107-3.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/howe2016/howe2016geob2104-3.txt Jacob N.W. Howe, Alexander M. Piotrowski, Delia W. Oppo, Kuo-Fang Huang, Stefan Mulitza, Cristiano M. Chiessi, Jurek Blusztajn2016Antarctic intermediate water circulation in the South Atlantic over the past 25,000 yearsPaleoceanography10.1002/2016PA002975http://onlinelibrary.wiley.com/doi/10.1002/2016PA002975/full START YEAR: 24300 cal yr BP * END YEAR: 2100 cal yr BP -46.4667 -27.5167 -46.4 -27.18