{"NOAAStudyId":"16156","contactInfo":{"address":"325 Broadway, E/NE31","city":"Boulder","constraints":"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.","country":"USA","dataCenterUrl":"https://www.ncdc.noaa.gov/data-access/paleoclimatology-data","email":"paleo@noaa.gov","fax":"303-497-6513","longName":"National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce ","phone":"303-497-6280","postalCode":"80305-3328","shortName":"DOC/NOAA/NESDIS/NCEI","state":"CO","type":"CONTACT INFORMATION"},"contributionDate":"2014-03-17","dataPublisher":"NOAA","dataType":"PALEOCEANOGRAPHY","dataTypeInformation":"https://www.ncdc.noaa.gov/data-access/paleoclimatology-data/datasets/paleoceanography","difMetadataLink":"http://www1.ncdc.noaa.gov/pub/data/metadata/published/paleo/dif/xml/noaa-ocean-16156.xml","doi":null,"earliestYearBP":22600,"earliestYearCE":-20650,"entryId":"noaa-ocean-16156","funding":[{"fundingAgency":"US National Science Foundation","fundingGrant":null},{"fundingAgency":"Lawrence J. Pratt and Melinda M. Hall Endowed Fund for WHOI Interdisciplinary Re","fundingGrant":null},{"fundingAgency":"Taiwan National Science Council","fundingGrant":null}],"investigators":"Huang, K.-F.; Oppo, D.W.; Curry, W.B.","mostRecentYearBP":70,"mostRecentYearCE":1880,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/16156","originalSource":null,"publication":[{"abstract":"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.","author":{"name":"Huang, K.-F., D.W. Oppo, and W.B. Curry"},"citation":"Huang, K.-F., D.W. Oppo, and W.B. Curry. 2014. Decreased influence of Antarctic intermediate water in the tropical Atlantic during North Atlantic cold events. Earth and Planetary Science Letters, 389, 200-208. doi: 10.1016/j.epsl.2013.12.037","edition":null,"identifier":{"id":"10.1016/j.epsl.2013.12.037","type":"doi","url":"http://dx.doi.org/10.1016/j.epsl.2013.12.037"},"issue":null,"journal":"Earth and Planetary Science Letters","pages":"200-208","pubRank":"1","pubYear":2014,"reportNumber":null,"title":"Decreased influence of Antarctic intermediate water in the tropical Atlantic during North Atlantic cold events","type":"publication","volume":"389"}],"reconstruction":"N","scienceKeywords":["Heinrich Events","Younger Dryas"],"site":[{"NOAASiteId":"55824","geo":{"geoType":"Feature","geometry":{"coordinates":["7.836","-53.663333"],"type":"POINT"},"properties":{"easternmostLongitude":"-53.663333","maxElevationMeters":"-947","minElevationMeters":"-947","northernmostLatitude":"7.836","southernmostLatitude":"7.836","westernmostLongitude":"-53.663333"}},"locationName":"Ocean>Atlantic Ocean>North Atlantic 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