{"xmlId":"68391","NOAAStudyId":"27812","studyName":"Yermak Plateau, Arctic Ocean 227ka Foraminifer Amino Acid Racemization Data","doi":"https://doi.org/10.25921/0dny-d516","uuid":"a22ece86-e8b1-411b-b5dc-039a56cc4ad7","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":"OTHER COLLECTIONS","investigators":"West, G.; Kaufman, D.S.; Muschitiello, F.; Forwick, M.; Matthiessen, J.; Wollenburg, J.; O'Regan, M.","investigatorDetails":[{"firstName":"Gabriel","lastName":"West","initials":"G.","orcId":"0000-0002-6458-6245"},{"firstName":"Darrell","lastName":"Kaufman","initials":"D.S.","orcId":"0000-0002-7572-1414"},{"firstName":"Francesco","lastName":"Muschitiello","initials":"F.","orcId":null},{"firstName":"Matthias","lastName":"Forwick","initials":"M.","orcId":null},{"firstName":"Jens","lastName":"Matthiessen","initials":"J.","orcId":null},{"firstName":"Jutta","lastName":"Wollenburg","initials":"J.","orcId":null},{"firstName":"Matt","lastName":"O'Regan","initials":"M.","orcId":"0000-0002-6046-1488"}],"version":"1.0","funding":[{"fundingAgency":"Swedish Research Council (VR)","fundingGrant":"DNR-2016-05092"},{"fundingAgency":"US National Science Foundation","fundingGrant":"NSF-1855381"}],"studyNotes":"Amino acid racemization (AAR) data on Neogloboquadrina pachyderma and Cassidulina neoteretis samples from marine sediment cores from the Yermak Plateau, Arctic Ocean.","onlineResourceLink":"https://www.ncei.noaa.gov/access/paleo-search/study/27812","difMetadataLink":"https://www.ncei.noaa.gov/pub/data/metadata/published/paleo/dif/xml/noaa-other-27812.xml","isoMetadataLink":"https://www.ncei.noaa.gov/pub/data/metadata/published/paleo/iso/xml/noaa-other-27812.xml","originalSource":null,"dataTypeInformation":"https://www.ncei.noaa.gov/products/paleoclimatology/other-collections","studyCode":null,"scienceKeywords":null,"reconstruction":"N","contributionDate":"2019-11-02","entryId":"noaa-other-27812","earliestYearBP":229000,"mostRecentYearBP":0,"earliestYearCE":-227050,"mostRecentYearCE":1950,"publication":[{"author":{"name":"Gabriel West, Darrell S. Kaufman, Francesco Muschitiello, Matthias Forwick, Jens Matthiessen, Jutta Wollenburg, Matt O'Regan"},"pubYear":2019,"title":"Amino acid racemization in Quaternary foraminifera from the Yermak Plateau","journal":"Geochronology","volume":null,"edition":null,"issue":null,"pages":null,"reportNumber":null,"citation":"Gabriel West, Darrell S. Kaufman, Francesco Muschitiello, Matthias Forwick, Jens Matthiessen, Jutta Wollenburg, Matt O'Regan. 2019. Amino acid racemization in Quaternary foraminifera from the Yermak Plateau. Geochronology. . doi: 10.5194/gchron-2019-5","type":"publication","identifier":{"type":"doi","id":"10.5194/gchron-2019-5","url":"http://dx.doi.org/10.5194/gchron-2019-5"},"abstract":"Amino acid racemization (AAR) geochronology is a powerful tool for dating Quaternary marine sediments across the globe, yet its application to Arctic Ocean sediments has been limited. Anomalous rates of AAR in foraminifera from the central Arctic were reported in previously published studies, indicating that either the rate of racemization is higher in this area, or inaccurate age models were used to constrain the sediment ages. This study investigates racemization rates in foraminifera from three well-dated sediment cores taken from the Yermak Plateau during the 2015 TRANSSIZ Expedition on RV Polarstern. D and L isomers of the amino acids, aspartic acid (Asp) and glutamic acid (Glu), were separated in samples of the planktic foraminifera, Neogloboquadrina pachyderm and the benthic species, Cassidulina neoteretis to quantify the extent of racemization. In total, 241 subsamples were analysed, extending back to Marine Isotope Stage (MIS) 7. Two previously published power functions, which relate the extent of racemization of Asp and Glu in foraminifera to sample age are revisited, and a comparison is made between the ages predicted by these calibrated age equations and independent geochronological constraints available for the cores. Our analyses reveal an excellent match between ages predicted by a global compilation of racemization rates for N. pachyderma, and confirm that a proposed Arctic-specific calibration curve is not applicable at the Yermak Plateau. These results generally support the rates of AAR determined for other cold bottom water sites, and further highlight the anomalous nature of the purportedly high rate of racemization indicated by previous analyses of central Arctic sediments.","pubRank":"1"}],"site":[{"NOAASiteId":"58112","siteName":"Yermak Plateau","siteCode":null,"mappable":"N","locationName":"Ocean>Arctic Ocean","geo":{"geoType":"Feature","geometry":{"type":"POLYGON","coordinates":["81.123","81.94983","8.466167","13.82833"]},"properties":{"southernmostLatitude":"81.123","northernmostLatitude":"81.94983","westernmostLongitude":"8.466167","easternmostLongitude":"13.82833","minElevationMeters":null,"maxElevationMeters":null}},"paleoData":[{"dataTableName":"West2019foram","NOAADataTableId":"40477","earliestYear":229000,"mostRecentYear":0,"timeUnit":"cal yr BP","earliestYearBP":229000,"mostRecentYearBP":0,"earliestYearCE":-227050,"mostRecentYearCE":1950,"coreLengthMeters":null,"dataTableNotes":null,"species":[],"dataFile":[{"fileUrl":"https://www.ncei.noaa.gov/pub/data/paleo/aar/west2019foram/west2019foram.txt","urlDescription":"NOAA Template File","linkText":"Yermak Plateau Foraminifer Amino Acid Racemization Data","variables":[],"NOAAKeywords":["earth science>paleoclimate>others"]},{"fileUrl":"https://www.ncei.noaa.gov/pub/data/paleo/aar/west2019foram/west2019foram.xlsx","urlDescription":"Excel File","linkText":"Yermak Plateau Foraminifer Amino Acid Racemization Data","variables":[],"NOAAKeywords":["earth science>paleoclimate>others"]}]}]}],"reference":{"pastThesaurusSkos":"https://www.ncei.noaa.gov/access/paleo-search/skos/past-thesaurus.rdf","pastThesaurusExplorer":"https://www.ncei.noaa.gov/access/paleo-search/cvterms","gcmdKeywordThesaurus":"https://earthdata.nasa.gov/earth-observation-data/find-data/idn/gcmd-keywords"},"dataLicenseDescription":null,"dataLicenseUrl":null}