noaa-ocean-16156 Western Tropical North Atlantic Foraminifera-based Nd Isotope Data Since the Last Glacial Maximum Huang, K.-F.; Oppo, D.W.; Curry, W.B. Western Tropical North Atlantic Foraminifera-based Nd Isotope Data Since the Last Glacial Maximum 2014-03-17 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/16156 Investigator K.-F. Huang Investigator D.W. Oppo Investigator W.B. Curry earth science paleoclimate paleoceanography age,null,null,calendar year before present,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography epsilon neodymium,planktic foraminifer,null,epsilon unit,null,paleoceanography,null,inductively-coupled plasma mass spectrometry,N,reference period: 0-23 kyr BP earth science paleoclimate paleoceanography epsilon neodymium,planktic foraminifer,two standard deviations,epsilon unit,null,paleoceanography,null,inductively-coupled plasma mass spectrometry,N,reference period: 0-23 kyr BP earth science paleoclimate paleoceanography depth,null,null,centimeter,null,paleoceanography,null,null,N,null earth science paleoclimate paleocean geochemistry geoscientificInformation Heinrich Events Younger Dryas 22600 cal yr BP 70 cal yr BP Complete 7.7045 7.93 -53.785333 -53.575167 -1100 -671 Ocean Atlantic Ocean North Atlantic Ocean KNR197-3-9GGC>LATITUDE 7.93>LONGITUDE -53.575167 Ocean Atlantic Ocean North Atlantic Ocean KNR197-3-46CDH>LATITUDE 7.836>LONGITUDE -53.663333 Ocean Atlantic Ocean North Atlantic Ocean KNR197-3-25GGC>LATITUDE 7.7045>LONGITUDE -53.785333 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 Huang, K.-F., D.W. Oppo, and W.B. Curry 2014 Earth and Planetary Science Letters 389 200-208 10.1016/j.epsl.2013.12.037

Antarctic Intermediate Water (AAIW) is a key player in the global ocean circulation, contributing to the upper limb of the Atlantic Meridional Overturning Circulation (AMOC), and influencing interhemispheric heat exchange and the distribution of salinity, nutrients and carbon. However, the deglacial history of AAIW flow into the North Atlantic is controversial. Here we present a multicore-top neodymium isotope calibration, which confirms the ability of unclean foraminifera to faithfully record bottom water neodymium isotopic composition (eNd) values in their authigenic coatings. We then present the first foraminifera-based reconstruction of eNd from three sediment cores retrieved from within modern AAIW, in the western tropical North Atlantic. Our records reveal similar glacial and interglacial contributions of AAIW, and a pronounced decrease in the AAIW fraction during North Atlantic deglacial cold episodes, Heinrich Stadial 1 (HS1) and Younger Dryas (YD). Our results suggest two separate phases of reduced fraction of AAIW in the tropical Atlantic during HS1, with a greater reduction during early HS1. If a reduction in AAIW fraction also reflects reduced AMOC strength, these finding may explain why, in many regions, there are two phases of hydrologic change within HS1, and why atmospheric CO2 rose more rapidly during early than late HS1. Our result suggesting less flow of AAIW into the Atlantic during North Atlantic cold events contrasts with evidence from the Pacific, where intermediate-depth eNd records may indicate increased flow of AAIW into the Pacific during the these same events. Antiphased eNd behavior between intermediate depths of the North Atlantic and Pacific implies that the flow of AAIW into Atlantic and Pacific seesawed during the last deglaciation. STUDY NOTES: Keywords from journal: Nd isotopes; Antarctic intermediate water; Atlantic meridional overturning circulation; deglacial variability; North Atlantic cold events

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/huang2014/huang2014-25ggc.txt Formatted Text File; KNR197-3-25GGC eNd Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/huang2014/huang2014-46cdh.txt Formatted Text File; KNR197-3-46CDH eNd Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/huang2014/huang2014-9ggc.txt Formatted Text File; KNR197-3-9GGC eNd Data USA/NOAA DIF Version 9.8.4 2019-06-06 2019-06-06