{"NOAAStudyId":"20673","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":"2016-10-27","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-20673.xml","doi":null,"earliestYearBP":24300,"earliestYearCE":-22350,"entryId":"noaa-ocean-20673","funding":[{"fundingAgency":"Natural Environment Research Council (NERC)","fundingGrant":"NE/K005235/1, NE/F006047/1 "},{"fundingAgency":"Deutsche Forschungsgemeinschaft","fundingGrant":null},{"fundingAgency":"US National Science Foundation","fundingGrant":"OCE-1335191"}],"investigators":"Howe, J.N.W.; Piotrowski, A.; Oppo, D.W.; Huang, K.-F.; Mulitza, S.; Chiessi, C.M.; Blusztajn, J.","mostRecentYearBP":2100,"mostRecentYearCE":-150,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/20673","originalSource":null,"publication":[{"abstract":"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.","author":{"name":"Jacob N.W. Howe, Alexander M. Piotrowski, Delia W. Oppo, Kuo-Fang Huang, Stefan Mulitza, Cristiano M. Chiessi, Jurek Blusztajn"},"citation":"Jacob N.W. Howe, Alexander M. Piotrowski, Delia W. Oppo, Kuo-Fang Huang, Stefan Mulitza, Cristiano M. Chiessi, Jurek Blusztajn. 2016. Antarctic intermediate water circulation in the South Atlantic over the past 25,000 years. Paleoceanography. . doi: 10.1002/2016PA002975","edition":null,"identifier":{"id":"10.1002/2016PA002975","type":"doi","url":"http://dx.doi.org/10.1002/2016PA002975"},"issue":null,"journal":"Paleoceanography","pages":null,"pubRank":"1","pubYear":2016,"reportNumber":null,"title":"Antarctic intermediate water circulation in the South Atlantic over the past 25,000 years","type":"publication","volume":null}],"reconstruction":"N","scienceKeywords":["Meridional Overturning Circulation (MOC)"],"site":[{"NOAASiteId":"52576","geo":{"geoType":"Feature","geometry":{"coordinates":["-27.18","-46.45"],"type":"POINT"},"properties":{"easternmostLongitude":"-46.45","maxElevationMeters":"-1048","minElevationMeters":"-1048","northernmostLatitude":"-27.18","southernmostLatitude":"-27.18","westernmostLongitude":"-46.45"}},"locationName":"Ocean>Atlantic Ocean>South Atlantic Ocean","mappable":"Y","paleoData":[{"NOAADataTableId":"31429","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth 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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.","version":"1.0","xmlId":"18490"}