georefid:2012-021032SEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContact2013-07-08T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=10.1126/science.1203909<gco:CharacterString>The role of carbon dioxide during the onset of Antarctic glaciation</gco:CharacterString>2011-01-01publicationgeorefid:2012-021032doi:10.1126/science.1203909Pagani, MarkYale University, Department of Geology and Geophysics, New Haven, CT, United StatesauthorHuber, MatthewPurdue University, United StatesauthorLiu, ZhonghuiUniversity of Hong Kong, ChinaauthorBohaty, Steven M.University of Southampton, United KingdomauthorHenderiks, JorijntjeUppsala University, SwedenauthorSijp, WillemUniversity of New South Wales, AustraliaauthorKrishnan, SrinathUniversity of Massachusetts-Amherst, United StatesauthorDeConto, Robert M.authorAmerican Association for the Advancement of Science, Washington, DC, United StatespublisherdocumentDigitalScience334 (6060)1261-1264Earth's modern climate, characterized by polar ice sheets and large equator-to-pole temperature gradients, is rooted in environmental changes that promoted Antarctic glaciation approximately 33.7 million years ago. Onset of Antarctic glaciation reflects a critical tipping point for Earth's climate and provides a framework for investigating the role of atmospheric carbon dioxide (CO (sub 2) ) during major climatic change. Previously published records of alkenone-based CO (sub 2) from high- and low-latitude ocean localities suggested that CO (sub 2) increased during glaciation, in contradiction to theory. Here, we further investigate alkenone records and demonstrate that Antarctic and subantarctic data overestimate atmospheric CO (sub 2) levels, biasing long-term trends. Our results show that CO (sub 2) declined before and during Antarctic glaciation and support a substantial CO (sub 2) decrease as the primary agent forcing Antarctic glaciation, consistent with model-derived CO (sub 2) thresholds.completedStratigraphyAntarcticaAtlantic OceanC-13/C-12Campbell Plateaucarboncarbon dioxideCeara RiseCenozoicDeep Sea Drilling ProjectDSDP Site 277DSDP Site 511DSDP Site 513DSDP Site 516DSDP Site 612Equatorial AtlanticglaciationIPODisotope ratiosisotopesLeg 154Leg 177Leg 29Leg 71Leg 72Leg 95North AtlanticO-18/O-16Ocean Drilling ProgramODP Site 1090ODP Site 925ODP Site 929OligoceneoxygenPacific Oceanpaleo-oceanographyPaleogenereconstructionRio Grande Risesea-surface temperatureSouth AtlanticSouth PacificSouthern OceanSouthwest Pacificstable isotopesTertiaryWest Pacificurn:org.iodp:exp:154urnlargerWorkCitationcampaignurn:org.iodp:exp:177urnlargerWorkCitationcampaignurn:org.iodp:exp:29urnlargerWorkCitationcampaignurn:org.iodp:exp:71urnlargerWorkCitationcampaignurn:org.iodp:exp:72urnlargerWorkCitationcampaignurn:org.iodp:exp:95urnlargerWorkCitationcampaignurn:org.iodp:exp:29:site:277urnlargerWorkCitationstudyurn:org.iodp:exp:29urnlargerWorkCitationcampaignurn:org.iodp:exp:71:site:511urnlargerWorkCitationstudyurn:org.iodp:exp:71urnlargerWorkCitationcampaignurn:org.iodp:exp:71:site:513urnlargerWorkCitationstudyurn:org.iodp:exp:71urnlargerWorkCitationcampaignurn:org.iodp:exp:72:site:516urnlargerWorkCitationstudyurn:org.iodp:exp:72urnlargerWorkCitationcampaignurn:org.iodp:exp:95:site:612urnlargerWorkCitationstudyurn:org.iodp:exp:95urnlargerWorkCitationcampaignurn:org.iodp:exp:177:site:1090urnlargerWorkCitationstudyurn:org.iodp:exp:177urnlargerWorkCitationcampaignurn:org.iodp:exp:154:site:925urnlargerWorkCitationstudyurn:org.iodp:exp:154urnlargerWorkCitationcampaignurn:org.iodp:exp:154:site:929urnlargerWorkCitationstudyurn:org.iodp:exp:154urnlargerWorkCitationcampaignEnglishgeoscientificInformation-180.0000180.0000-90.000038.4913AntarcticaCampbell PlateauCeara RiseRio Grande RiseSouthern OceanSupplemental information/data is available in the online version of this articleapplication/pdfunknownSEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContacthttp://www.sciencemag.org/content/334/6060/1261.full.pdfdownload