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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":"Mortyn, P.G.; Charles, C.D.","investigatorDetails":[{"firstName":"P. Graham","lastName":"Mortyn","initials":"P.G.","orcId":"0000-0002-9473-4309"},{"firstName":"Christopher","lastName":"Charles","initials":"C.D.","orcId":"0000-0003-4016-2365"}],"version":"1.0","funding":[{"fundingAgency":"US National Oceanic and Atmospheric Administration (NOAA)","fundingGrant":null},{"fundingAgency":"US National Science Foundation","fundingGrant":null}],"studyNotes":"Plankton tow foraminiferal census and stable isotope (d18O and d13C) and water chemistry data collected near 6 drill sites in the Atlantic sector of the Southern Ocean. d18O analyses were carried out on the 150-250-um fraction of Globigerina bulloides, Neogloboquadrina pachyderma, Globorotalia truncatulinoides, Globorotalia inflata, and Orbulina universa. ","onlineResourceLink":"https://www.ncei.noaa.gov/access/paleo-search/study/21990","difMetadataLink":"https://www.ncei.noaa.gov/pub/data/metadata/published/paleo/dif/xml/noaa-ocean-21990.xml","isoMetadataLink":"https://www.ncei.noaa.gov/pub/data/metadata/published/paleo/iso/xml/noaa-ocean-21990.xml","originalSource":null,"dataTypeInformation":"https://www.ncei.noaa.gov/products/paleoclimatology/paleoceanography","studyCode":null,"scienceKeywords":null,"reconstruction":"N","contributionDate":"2017-04-24","entryId":"noaa-ocean-21990","earliestYearBP":-46,"mostRecentYearBP":-47,"earliestYearCE":1996,"mostRecentYearCE":1997,"publication":[{"author":{"name":"P. Graham Mortyn and Christopher D. Charles"},"pubYear":2003,"title":"Planktonic foraminiferal depth habitat and d18O calibrations: Plankton tow results from the Atlantic sector of the Southern Ocean","journal":"Paleoceanography","volume":"18","edition":null,"issue":"2","pages":null,"reportNumber":null,"citation":"P. Graham Mortyn and Christopher D. Charles. 2003. Planktonic foraminiferal depth habitat and d18O calibrations: Plankton tow results from the Atlantic sector of the Southern Ocean. Paleoceanography, 18(2). doi: 10.1029/2001PA000637","type":"publication","identifier":{"type":"doi","id":"10.1029/2001PA000637","url":"http://dx.doi.org/10.1029/2001PA000637"},"abstract":"Plankton tows conducted in the Atlantic sector of the Southern Ocean allow analysis of the influence of water column structure on planktonic foraminiferal abundance and d18O composition. Foraminiferal abundance varies by several orders of magnitude across a large gradient in sea surface temperature and other hydrographic features, demonstrating high sensitivity of foraminiferal populations to regional differences in water properties. The depth of maximum abundance for key species such as Globigerina bulloides and Neogloboquadrina pachyderma is not constant from station to station. The pattern suggests that their abundance and shell chemistry are tied to density horizons or other conditions (such as food availability) that become more sharply defined with depth in the northern subantarctic. The consistent observation of Globorotalia inflata and Globoratalia truncatulinoides as relatively deep-dwelling species confirms their utility as indicators of upper thermocline properties. In d18O all species are observed to be isotopically lighter than predicted from water properties, but the species-specific offset is fairly uniform at all stations. 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