georefid:2006-066330SEDIS 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.1120044<gco:CharacterString>Timing and climatic consequences of the opening of Drake Passage</gco:CharacterString>2006-01-01publicationgeorefid:2006-066330doi:10.1126/science.1120044Scher, Howie D.University of Florida, Department of Geological Sciences, Gainesville, FL, United StatesauthorMartin, Ellen E.authorAmerican Association for the Advancement of Science, Washington, DC, United StatespublisherdocumentDigitalScience312 (5772)428-430Age estimates for the opening of Drake Passage range from 49 to 17 million years ago (Ma), complicating interpretations of the relationship between ocean circulation and global cooling. Secular variations of neodymium isotope ratios at Agulhas Ridge (Southern Ocean, Atlantic sector) suggest an influx of shallow Pacific seawater approximately 41 Ma. The timing of this connection and the subsequent deepening of the passage coincide with increased biological productivity and abrupt climate reversals. Circulation/productivity linkages are proposed as a mechanism for declining atmospheric carbon dioxide. These results also indicate that Drake Passage opened before the Tasmanian Gateway, implying the late Eocene establishment of a complete circum-Antarctic pathway.completedStratigraphyAgulhas BankAtlantic OceanbiostratigraphyC-13/C-12carbonCenozoiccoresDrake PassageEoceneferromanganese crustsForaminiferaIndian OceanInvertebrataisotope ratiosisotopesmarine sedimentsmetalsmicrofossilsNd-144/Nd-143neodymiumO-18/O-16Ocean Drilling ProgramoxygenPacific Oceanpaleo-oceanographypaleoclimatologyPaleogenepaleogeographyProtistarare earthsreconstructionsedimentsSouthern Oceanstable isotopesTertiaryWeddell Seaworld oceanEnglishgeoscientificInformation-80.0000147.0000-78.000075.0000Atlantic OceanDrake PassageIndian OceanWeddell Seaapplication/pdfunknownSEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContacthttp://www.sciencemag.org/content/312/5772/428.full.pdfdownload