{"xmlId":"15338","NOAAStudyId":"17675","studyName":"Southwest Atlantic Deglacial Planktonic and Benthic D14C Data","doi":"https://doi.org/10.25921/d37k-n159","uuid":"f82fb4b2-0c91-46c5-8060-788b1799455f","dataPublisher":"NOAA","contactInfo":{"type":"CONTACT INFORMATION","shortName":"DOC/NOAA/NESDIS/NCEI","longName":"National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce ","address":"325 Broadway, E/NE31","city":"Boulder","state":"CO","postalCode":"80305-3328","country":"USA","dataCenterUrl":"https://www.ncei.noaa.gov/products/paleoclimatology","email":"paleo@noaa.gov","phone":"828-271-4800","fax":null,"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."},"dataType":"PALEOCEANOGRAPHY","investigators":"Sortor, R.N.; Lund, D.C.","investigatorDetails":[{"firstName":"Rachel","lastName":"Sortor","initials":"R.N.","orcId":null},{"firstName":"David","lastName":"Lund","initials":"D.C.","orcId":"0000-0002-4847-2889"}],"version":"1.0","funding":[],"studyNotes":"Planktonic and benthic foraminiferal D14C data from southwest Atlantic core KNR-159-5-36GGC for the deglacial period (~18-14 KYrBP). ","onlineResourceLink":"https://www.ncei.noaa.gov/access/paleo-search/study/17675","difMetadataLink":"https://www.ncei.noaa.gov/pub/data/metadata/published/paleo/dif/xml/noaa-ocean-17675.xml","isoMetadataLink":"https://www.ncei.noaa.gov/pub/data/metadata/published/paleo/iso/xml/noaa-ocean-17675.xml","originalSource":null,"dataTypeInformation":"https://www.ncei.noaa.gov/products/paleoclimatology/paleoceanography","studyCode":null,"scienceKeywords":null,"reconstruction":"N","contributionDate":"2015-01-05","entryId":"noaa-ocean-17675","earliestYearBP":20110,"mostRecentYearBP":4730,"earliestYearCE":-18160,"mostRecentYearCE":-2780,"publication":[{"author":{"name":"Rachel N. Sortor and David C. Lund"},"pubYear":2011,"title":"No evidence for a deglacial intermediate water D14C anomaly in the SW Atlantic","journal":"Earth and Planetary Science Letters","volume":"310","edition":null,"issue":"1-2","pages":"65-72","reportNumber":null,"citation":"Rachel N. Sortor and David C. Lund. 2011. No evidence for a deglacial intermediate water D14C anomaly in the SW Atlantic. Earth and Planetary Science Letters, 310(1-2), 65-72. doi: 10.1016/j.epsl.2011.07.017","type":"publication","identifier":{"type":"doi","id":"10.1016/j.epsl.2011.07.017","url":"http://dx.doi.org/10.1016/j.epsl.2011.07.017"},"abstract":"The last deglaciation was characterized by an increase in atmospheric pCO2 and decrease in atmospheric radiocarbon activity. One hypothesis is that these changes were due to out-gassing of 14C-depleted carbon from the abyssal ocean. Reconstructions of foraminiferal D14C from the eastern tropical Pacific, Arabian Sea, and high latitude North Atlantic show that severe depletions in 14C occurred at intermediate water depths during the last deglaciation. It has been suggested that 14C-depleted water from the abyss upwelled in the Southern Ocean and was then carried by Antarctic Intermediate Water (AAIW) to these sites. However, locations in the South Pacific in the direct path of modern-day AAIW do not exhibit the D14C excursion and therefore cast doubt upon the AAIW mechanism (De Pol-Holz et al., 2010 and Rose et al., 2010). Here we evaluate whether or not a deglacial 14C anomaly occurred at intermediate depths in the Southwest Atlantic. We find that the deglacial benthic D14C trend at our site is similar to the atmospheric D14C trend. Our results are also largely consistent with results from U/Th-dated corals at shallower water depths on the Brazil Margin (Mangini et al., 2010). We find no evidence in the southwestern Atlantic of a ~300 per mil decrease in intermediate water D14C from 18 to 14 kyr BP like that observed in the eastern tropical Pacific (Marchitto et al., 2007). When our results are paired with those from the South Pacific, it appears AAIW did not carry a highly 14C-depleted signal during the deglaciation. Another source of carbon is apparently required to explain the intermediate-depth D14C anomalies in the North Atlantic, Indian, and Pacific Oceans.","pubRank":"1"}],"site":[{"NOAASiteId":"56453","siteName":"KNR159-5-36GGC","siteCode":null,"mappable":"Y","locationName":"Ocean>Atlantic Ocean>South Atlantic Ocean","geo":{"geoType":"Feature","geometry":{"type":"POINT","coordinates":["-27.5167","-46.4667"]},"properties":{"southernmostLatitude":"-27.5167","northernmostLatitude":"-27.5167","westernmostLongitude":"-46.4667","easternmostLongitude":"-46.4667","minElevationMeters":"-1268","maxElevationMeters":"-1268"}},"paleoData":[{"dataTableName":"Sortor2011plank","NOAADataTableId":"27994","earliestYear":19340,"mostRecentYear":4920,"timeUnit":"cal yr BP","earliestYearBP":19340,"mostRecentYearBP":4920,"earliestYearCE":-17390,"mostRecentYearCE":-2970,"coreLengthMeters":null,"dataTableNotes":null,"species":[],"dataFile":[{"fileUrl":"https://www.ncei.noaa.gov/pub/data/paleo/contributions_by_author/sortor2011/sortor2011plank.txt","urlDescription":"Data File","linkText":"Planktonic radiocarbon data KNR159-5-36GGC","variables":[{"cvDataType":"PALEOCEANOGRAPHY","cvWhat":"sampling metadata>notes","cvMaterial":null,"cvError":null,"cvUnit":null,"cvSeasonality":null,"cvDetail":null,"cvMethod":null,"cvAdditionalInfo":"Species","cvFormat":"Character","cvShortName":null},{"cvDataType":"PALEOCEANOGRAPHY","cvWhat":"sampling metadata>notes","cvMaterial":null,"cvError":null,"cvUnit":null,"cvSeasonality":null,"cvDetail":null,"cvMethod":null,"cvAdditionalInfo":"UCIAMS sample number","cvFormat":"Numeric","cvShortName":null},{"cvDataType":"PALEOCEANOGRAPHY","cvWhat":"depth variable>depth","cvMaterial":null,"cvError":null,"cvUnit":"length unit>centimeter","cvSeasonality":null,"cvDetail":null,"cvMethod":null,"cvAdditionalInfo":null,"cvFormat":"Numeric","cvShortName":null},{"cvDataType":"PALEOCEANOGRAPHY","cvWhat":"age variable>age","cvMaterial":null,"cvError":null,"cvUnit":"time unit>age unit>radiocarbon year before present","cvSeasonality":null,"cvDetail":null,"cvMethod":null,"cvAdditionalInfo":null,"cvFormat":"Numeric","cvShortName":null},{"cvDataType":"PALEOCEANOGRAPHY","cvWhat":"age variable>age","cvMaterial":null,"cvError":"unspecified error>unspecified margin of error","cvUnit":"time unit>age unit>radiocarbon year before present","cvSeasonality":null,"cvDetail":null,"cvMethod":null,"cvAdditionalInfo":null,"cvFormat":"Numeric","cvShortName":null},{"cvDataType":"PALEOCEANOGRAPHY","cvWhat":"age variable>age","cvMaterial":null,"cvError":"standard deviation>one standard deviation lower bound","cvUnit":"time unit>age unit>calendar year before present","cvSeasonality":null,"cvDetail":null,"cvMethod":null,"cvAdditionalInfo":"CALIB 6.0 - 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