georefid:2005-032178SEDIS 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.1100061<gco:CharacterString>Middle Miocene Southern Ocean cooling and Antarctic cryosphere expansion</gco:CharacterString>2004-01-01publicationgeorefid:2005-032178doi:10.1126/science.1100061Shevenell, Amelia E.University of California at Santa Barbara, Department of Geological Sciences, Santa Barbara, CA, United StatesauthorKennett, James P.authorLea, David W.authorAmerican Association for the Advancement of Science, Washington, DC, United StatespublisherdocumentDigitalScience305 (5691)1766-1770Magnesium/calcium data from Southern Ocean planktonic foraminifera demonstrate that high-latitude ( approximately 55 degrees S) southwest Pacific sea surface temperatures (SSTs) cooled 6 degrees to 7 degrees C during the middle Miocene climate transition (14.2 to 13.8 million years ago). Stepwise surface cooling is paced by eccentricity forcing and precedes Antarctic cryosphere expansion by approximately 60 thousand years, suggesting the involvement of additional feedbacks during this interval of inferred low-atmospheric partial pressure of CO (sub 2) (p (sub CO2) ). (modif. j. abstr.)completedStratigraphyalkaline earth metalsAntarctic ice sheetAntarcticacalcitecalciumcarboncarbon cyclecarbon dioxidecarbonatesCenozoicchemical ratiosclimate changeclimate forcingcoolingForaminiferageochemical cycleGlobigerinaGlobigerina bulloidesGlobigerinaceaGlobigerinidaeInvertebrataisotope ratiosisotopesLeg 189magnesiummetalsMg/Camicrofossilsmiddle MioceneMioceneNeogeneO-18/O-16ocean circulationOcean Drilling Programorbital forcingoxygenpaleo-oceanographypaleoclimatologypaleotemperatureProtistaRotaliinasea-surface temperatureSouthern Oceanstable isotopesTertiaryurn:org.iodp:exp:189urnlargerWorkCitationcampaignEnglishgeoscientificInformation-180.0000180.0000-90.0000-42.3000AntarcticaSouthern Oceanapplication/pdfunknownSEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContacthttp://www.sciencemag.org/content/305/5691/1766.full.pdfdownload