georefid:2004-030396SEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-06-23T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=10.1126/science.1090300<gco:CharacterString>(super 14) C activity and global carbon cycle changes over the past 50,000 years</gco:CharacterString>2004-01-01publicationgeorefid:2004-030396doi:10.1126/science.1090300Hughen, K.Woods Hole Oceanographic Institution, Department of Marine Chemistry and Geochemistry,, Woods Hole, MA, United StatesauthorLehman, S.University of Colorado, United StatesauthorSouthon, J.University of California at Irvine, United StatesauthorOverpeck, J.University of Arizona, United StatesauthorMarchal, O.authorHerring, C.authorTurnbull, J.authorAmerican Association for the Advancement of Science, Washington, DC, United StatespublisherdocumentDigitalScience303 (5655)202-207A series of (super 14) C measurements in Ocean Drilling Program cores from the tropical Cariaco Basin, which have been correlated to the annual-layer counted chronology for the Greenland Ice Sheet Project 2 (GISP2) ice core, provides a high-resolution calibration of the radiocarbon time scale back to 50,000 years before the present. Independent radiometric dating of events correlated to GISP2 suggests that the calibration is accurate. Reconstructed (super 14) C activities varied substantially during the last glacial period, including sharp peaks synchronous with the Laschamp and Mono Lake geomagnetic field intensity minimal and cosmogenic nuclide peaks in ice cores and marine sediments. Simulations with a geochemical box model suggest that much of the variability can be explained by geomagnetically modulated changes in (super 14) C production rate together with plausible changes in deep-ocean ventilation and the global carbon cycle during glaciation.completedQuaternary geologyGeochronologyabsolute ageaccuracyArctic regionAtlantic OceanatmosphereC-14C-14/C-12calibrationcarboncarbon cycleCariaco BasinCaribbean SeaCenozoicconcentrationcorrelationdatesdynamicsgeochemical cycleGISP2GreenlandisotopesLeg 165modelsNorth AtlanticOcean Drilling ProgramODP Site 1002paleoclimatologyQuaternaryradioactive isotopessimulationstable isotopesSummit Greenlandvariationsurn:org.iodp:exp:165urnlargerWorkCitationcampaignurn:org.iodp:exp:165:site:1002urnlargerWorkCitationstudyurn:org.iodp:exp:165urnlargerWorkCitationcampaignEnglishgeoscientificInformation-65.1011-65.101110.422210.4222application/pdfunknownSEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContacthttp://www.sciencemag.org/content/303/5655/202.full.pdfdownload