{"NOAAStudyId":"16993","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":"2014-07-23","dataPublisher":"NOAA","dataType":"OTHER COLLECTIONS","dataTypeInformation":"https://www.ncdc.noaa.gov/data-access/paleoclimatology-data/datasets/other-collections","difMetadataLink":"http://www1.ncdc.noaa.gov/pub/data/metadata/published/paleo/dif/xml/noaa-other-16993.xml","doi":null,"earliestYearBP":1500000,"earliestYearCE":-1498050,"entryId":"noaa-other-16993","funding":[{"fundingAgency":"US National Science Foundation","fundingGrant":"09-29415"}],"investigators":"Kaufman, D.S.; Cooper, K.; Behl, R.J.; Billups, K.; Bright, J.; Gardner, K.; Hearty, P.; Jakobsson, M.; Mendes, I.; O'Leary, M.; Polyak, L.; Rasmussen, T.L.; Rosa, F.; Schmidt, M.W.","mostRecentYearBP":0,"mostRecentYearCE":1950,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/16993","originalSource":null,"publication":[{"abstract":"The deep-sea environment is among the most stable on Earth, making it well suited for amino acid\r\ngeochronology. Foraminifera with calcareous tests are distributed across the World Ocean and are often\r\nrecovered in sufficient abundance from sediment cores to derive robust mean amino acid D/L values of\r\nmultiple replicates from each stratigraphic level. The extent of racemization (D/L) can be compared with\r\nindependent age control, which in most cases is based on correlation with global marine oxygen-isotope\r\nstages and radiocarbon ages from the same stratigraphic levels. In this study, we report the results of\r\namino acid racemization analysis of multiple foraminifera species from well-dated sediment cores taken\r\nfrom the Pacific, Atlantic, and Arctic oceans. The composite of results analyzed to date (179 samples, each\r\ncomposed of an average of 8.6 subsamples = 1531 analyses) show that D/L values generally increase\r\nsystematically down core, and are similar for samples of comparable ages from different deep-sea sites.\r\nPreviously published equations that relate D/L values of aspartic and glutamic acids to post-depositional\r\ntemperature and sample age for Pulleniatina obliquiloculata generally conform to the D/L trends for\r\nspecies analyzed in this study. Laboratory heating experiments were used to quantify the difference in\r\nthe rate of racemization between P. obliquiloculata and other taxa. For example, aspartic acid in\r\nP. obliquiloculata racemizes an average of 12-16% faster than in the common high-latitude species,\r\nNeogloboquadrina pachyderma (s). Apparently, the unexpectedly high D/L values previously reported for\r\nN. pachyderma (s) older than 35 ka from the Arctic Ocean cannot be attributed to taxonomic effects.","author":{"name":"Darrell S. Kaufman, Katherine Cooper, Richard Behl, Katharina Billups, Jordon Bright,\r\nKarleen Gardner, Paul Hearty, Martin Jakobsson, Isabel Mendes, Michael O'Leary,\r\nLeonid Polyak, Tine Rasmussen, Francisca Rosa, and Matthew Schmidt"},"citation":"Darrell S. Kaufman, Katherine Cooper, Richard Behl, Katharina Billups, Jordon Bright,\r\nKarleen Gardner, Paul Hearty, Martin Jakobsson, Isabel Mendes, Michael O'Leary,\r\nLeonid Polyak, Tine Rasmussen, Francisca Rosa, and Matthew Schmidt. 2013. Amino acid racemization in mono-specific foraminifera from Quaternary deep-sea sediments. Quaternary Geochronology, 16, 50-61. doi: 10.1016/j.quageo.2012.07.006","edition":null,"identifier":{"id":"10.1016/j.quageo.2012.07.006","type":"doi","url":"http://dx.doi.org/10.1016/j.quageo.2012.07.006"},"issue":null,"journal":"Quaternary Geochronology","pages":"50-61","pubRank":"1","pubYear":2013,"reportNumber":null,"title":"Amino acid racemization in mono-specific foraminifera from Quaternary deep-sea sediments","type":"publication","volume":"16"}],"reconstruction":"N","scienceKeywords":null,"site":[{"NOAASiteId":"22723","geo":{"geoType":"Feature","geometry":{"coordinates":["-90","90","-180","180"],"type":"POLYGON"},"properties":{"easternmostLongitude":"180","maxElevationMeters":null,"minElevationMeters":null,"northernmostLatitude":"90","southernmostLatitude":"-90","westernmostLongitude":"-180"}},"locationName":"Geographic Region>Global","mappable":"N","paleoData":[{"NOAADataTableId":"27216","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>others"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/aar/kaufman2013foram/kaufman2013foram.txt","linkText":"Deep Sea Foraminiferal AAR Data","urlDescription":"Text Data File","variables":[]},{"NOAAKeywords":["earth science>paleoclimate>others"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/aar/kaufman2013foram/kaufman2013foram.xls","linkText":"Deep Sea Foraminiferal AAR Data","urlDescription":"Excel Data File","variables":[]}],"dataTableName":"Kaufman2013foram","dataTableNotes":null,"earliestYear":1500000,"earliestYearBP":1500000,"earliestYearCE":-1498050,"mostRecentYear":0,"mostRecentYearBP":0,"mostRecentYearCE":1950,"species":[],"timeUnit":"cal yr BP"}],"siteName":"Global"}],"studyCode":null,"studyName":"Deep Sea Sediment 1.5 Million Year Foraminiferal Amino Acid Racemization Data","studyNotes":"Amino acid racemization (AAR) data on mono-specific foraminifera from deep sea sediments. \nD/L aspartic acid and glutamic acid for multiple foraminifera species from marine \nsediment cores from the Pacific, Atlantic, and Arctic oceans.","version":"1.0","xmlId":"14699"}