{"xmlId":"10567","NOAAStudyId":"12524","studyName":"Southern Ocean Eocene-Oligocene Foraminiferal d18O and Mg/Ca Data","doi":"https://doi.org/10.25921/v7b8-y238","uuid":"1e27609b-b884-4610-8514-a45fbf4e7a34","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":"Bohaty, S.M.; Zachos, J.C.; Delaney, M.L.","investigatorDetails":[{"firstName":"Steven","lastName":"Bohaty","initials":"S.M.","orcId":null},{"firstName":"James","lastName":"Zachos","initials":"J.C.","orcId":"0000-0001-8439-1886"},{"firstName":"Margaret","lastName":"Delaney","initials":"M.L.","orcId":null}],"version":"1.0","funding":[{"fundingAgency":"US National Science Foundation","fundingGrant":"OPP-0338337"}],"studyNotes":"High-resolution stable oxygen isotope (d18O) and magnesium/calcium \n(Mg/Ca) records from planktic and benthic foraminifera at four \nOcean Drilling Program (ODP) sites in the Southern Ocean covering  \nthe Eocene-Oligocene transition (EOT), ~35 - 32 Ma. \n","onlineResourceLink":"https://www.ncei.noaa.gov/access/paleo-search/study/12524","difMetadataLink":"https://www.ncei.noaa.gov/pub/data/metadata/published/paleo/dif/xml/noaa-ocean-12524.xml","isoMetadataLink":"https://www.ncei.noaa.gov/pub/data/metadata/published/paleo/iso/xml/noaa-ocean-12524.xml","originalSource":null,"dataTypeInformation":"https://www.ncei.noaa.gov/products/paleoclimatology/paleoceanography","studyCode":null,"scienceKeywords":null,"reconstruction":"N","contributionDate":"2012-02-15","entryId":"noaa-ocean-12524","earliestYearBP":34998000,"mostRecentYearBP":32501000,"earliestYearCE":-34996050,"mostRecentYearCE":-32499050,"publication":[{"author":{"name":"Bohaty, S.M., J.C. Zachos, and M.L. Delaney"},"pubYear":2012,"title":"Foraminiferal Mg/Ca evidence for Southern Ocean cooling  across the Eocene-Oligocene transition","journal":"Earth and Planetary Science Letters","volume":"317-318","edition":null,"issue":null,"pages":"251-261","reportNumber":null,"citation":"Bohaty, S.M., J.C. Zachos, and M.L. Delaney. 2012. Foraminiferal Mg/Ca evidence for Southern Ocean cooling  across the Eocene-Oligocene transition. Earth and Planetary Science Letters, 317-318, 251-261. doi: 10.1016/j.epsl.2011.11.037","type":"publication","identifier":{"type":"doi","id":"10.1016/j.epsl.2011.11.037","url":"http://dx.doi.org/10.1016/j.epsl.2011.11.037"},"abstract":"Constraining the magnitude of high-latitude temperature change across the EoceneOligocene transition (EOT) is essential for quantifying the magnitude of Antarctic ice-sheet expansion and understanding regional climate response to this event. To this end, we constructed high-resolution stable oxygen isotope (´18O) and magnesium/calcium (Mg/Ca) records from planktic and benthic foraminifera at four Ocean Drilling Program (ODP) sites in the Southern Ocean. Planktic foraminiferal Mg/Ca records from the Kerguelen Plateau (ODP Sites 738, 744, and 748) show a consistent pattern of temperature change, indicating 23 °C cooling in direct conjunction with the first step of a two-step increase in benthic and planktic foraminiferal ´18O values across the EOT. In contrast, benthic Mg/Ca records from Maud Rise (ODP Site 689) and the Kerguelen Plateau (ODP Site 748) do not exhibit significant temperature change. The contrasting temperature histories derived from the planktic and benthic Mg/Ca records are not reconcilable, since vertical ´18O gradients remained nearly constant at all sites between 35.0 and 32.5 Ma. Based on the coherency of the planktic Mg/Ca records from the Kerguelen Plateau sites and complications with benthic Mg/Ca paleothermometry at low temperatures, the planktic Mg/Ca records are deemed the most reliable measure of Southern Ocean temperature change. We therefore interpret a uniform cooling of 23 °C in both deep surface (thermocline) waters and intermediate deep waters of the Southern Ocean across the EOT. Cooling of Southern Ocean surface waters across the EOT was likely propagated to the deep ocean, since deep waters were primarily sourced on the Antarctic margin throughout this time interval. Removal of the temperature component from the observed foraminiferal ´18O shift indicates that seawater ´18O values increased by 0.6 ± 0.150 across the EOT interval, corresponding to an increase in global ice volume to a level equivalent with 60130% modern East Antarctic ice sheet volume.","pubRank":"1"}],"site":[{"NOAASiteId":"52323","siteName":"ODP 748","siteCode":null,"mappable":"Y","locationName":"Ocean>Southern Ocean","geo":{"geoType":"Feature","geometry":{"type":"POINT","coordinates":["-58.441","78.9981"]},"properties":{"southernmostLatitude":"-58.441","northernmostLatitude":"-58.441","westernmostLongitude":"78.9981","easternmostLongitude":"78.9981","minElevationMeters":"-1290","maxElevationMeters":"-1290"}},"paleoData":[{"dataTableName":"ODP7482012","NOAADataTableId":"20869","earliestYear":34998000,"mostRecentYear":32529000,"timeUnit":"cal yr 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