noaa-ocean-20673 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. South Atlantic 24,000 Year Neodymium Isotope Data 2016-10-27 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/20673 Investigator J.N.W. Howe Investigator A. Piotrowski Investigator D.W. Oppo Investigator K.-F. Huang Investigator S. Mulitza Investigator C.M. Chiessi Investigator J. Blusztajn 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 other geoscientificInformation Meridional Overturning Circulation (MOC) 24300 cal yr BP 2100 cal yr BP Complete -27.5167 -27.18 -46.4667 -46.4 -1500 -1048 Ocean Atlantic Ocean South Atlantic Ocean GeoB2104-3>LATITUDE -27.3>LONGITUDE -46.4 Ocean Atlantic Ocean South Atlantic Ocean GeoB2107-3>LATITUDE -27.18>LONGITUDE -46.45 Ocean Atlantic Ocean South Atlantic Ocean KNR159-5-36GGC>LATITUDE -27.5167>LONGITUDE -46.4667 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 Jacob N.W. Howe, Alexander M. Piotrowski, Delia W. Oppo, Kuo-Fang Huang, Stefan Mulitza, Cristiano M. Chiessi, Jurek Blusztajn 2016 Paleoceanography 10.1002/2016PA002975 http://onlinelibrary.wiley.com/doi/10.1002/2016PA002975/full

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.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/howe2016/howe2016knr159-5-36ggc.txt Data File; Core KNR159-5-36GGC Neodymium Isotope Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/howe2016/howe2016geob2107-3.txt Data File; Core GeoB2107-3 Neodymium Isotope Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/howe2016/howe2016geob2104-3.txt Data File; Core GeoB2104-3 Neodymium Isotope Data USA/NOAA DIF Version 9.8.4 2019-06-06 2019-06-06