georefid:2010-038309SEDIS Publication Catalogue

ana.macario@awi.de

http://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-07-06T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=10.1038/nature078672009-01-01publicationgeorefid:2010-038309doi:10.1038/nature07867Naish, TimVictoria University of Wellington, Antarctic Research Centre, Wellington, New ZealandauthorPowell, R.Northern Illinois University, United StatesauthorLevy, R.University of Nebraska-Lincoln, United StatesauthorWilson, G.University of Otago, New ZealandauthorScherer, R.Universita di Siena, ItalyauthorTalarico, F.Ohio State University, United StatesauthorKrissek, L.Alfred Wegener Institute, Federal Republic of GermanyauthorNiessen, F.Istituto Nazionale di Geofisica e Vulcanologia, ItalyauthorPompilio, M.University of Massachusetts, Amherst, United StatesauthorWilson, T.Harvard University, United StatesauthorCarter, L.Pennsylvania State University, United StatesauthorDeConto, R. M.New Mexico Institute of Mining & Technology, United StatesauthorHuybers, P.Appalachian State University, United StatesauthorMcKay, R.Johns Hopkins University, United StatesauthorPollard, D.Federal Institute of Geosciences & National Resources, Federal Republic of GermanyauthorRoss, J.Universita Milano-Bicocca, ItalyauthorWinter, D.Colorado School of Mines, United StatesauthorBarrett, P.U. S. Geological Survey, United StatesauthorBrowne, G.University of Wisconsin-Oshkosh, United StatesauthorCody, R.Universita di Parma, ItalyauthorCowan, E.Iowa State University, United StatesauthorCrampton, J.Stanford University, United StatesauthorDunbar, G.University of Alberta, CanadaauthorFlorindo, F.Louisiana State University, United StatesauthorGebhardt, C.CNR ISMAR, ItalyauthorGraham, I.Albion College, United StatesauthorHannah, M.Lameont-Doherty Earth Observatory, United StatesauthorHansaraj, D.authorHarwood, D.authorHelling, D.authorHenrys, S.authorHinnov, L.authorKuhn, G.authorKyle, P.authorLaeufer, A.authorMaffioli, P.authorMagens, D.authorMandernack, K.authorMcIntosh, W.authorMillan, C.authorMorin, R.authorOhneiser, C.authorPaulsen, T.authorPersico, D.authorRaine, I.authorReed, J.authorRiesselman, C.authorSagnotti, LeonardoauthorSchmitt, D.authorSjunneskog, C.authorStrong, P.authorTaviani, M.authorVogel, S.authorWilch, T.authorWilliams, T.authorMacmillan Journals, London, United KingdompublisherdocumentHardcopyNature (London)458 (7236)322-328Thirty years after oxygen isotope records from microfossils deposited in ocean sediments confirmed the hypothesis that variations in the Earth's orbital geometry control the ice ages, fundamental questions remain over the response of the Antarctic ice sheets to orbital cycles. Furthermore, an understanding of the behaviour of the marine-based West Antarctic ice sheet (WAIS) during the 'warmer-than-present' early-Pliocene epoch (approx. 5-3 Myr ago) is needed to better constrain the possible range of ice-sheet behavior in the context of future global warming. Here we present a marine glacial record from the upper 600 m of the AND-1B sediment core recovered from beneath the northwest part of the Ross ice shelf by the ANDRILL programme and demonstrate well-dated, approx. 40-kyr cyclic variations in ice-sheet extent linked to cycles in insolation influenced by changes in the Earth's axial tilt (obliquity) during the Pliocene. Our data provide direct evidence for orbitally induced oscillations in the WAIS, which periodically collapsed, resulting in a switch from grounded ice, or ice shelves, to open waters in the Ross embayment when planetary temperatures were up to approx 3 degrees C warmer than today and atmospheric CO (sub 2) concentration was as high as approx. 400 p.p.m.v. (mod. auth. abst.)completedStratigraphyANDRILLAntarctic ice sheetAntarcticacarbon dioxideCenozoicclimate changeclimate forcingcorescyclesdebrisDeep Sea Drilling Projectglacial geologyice raftingicebergsisotope ratiosisotopesLeg 119Leg 178Leg 188Leg 28lithostratigraphyNeogeneO-18/O-16obliquity of the eclipticOcean Drilling Programorbital forcingoxygenpaleoclimatologypaleoenvironmentPlioceneQuaternarysedimentary rockssedimentsSouthern Oceanstable isotopesTertiaryWest Antarctic ice sheeturn:org.iodp:exp:119urnlargerWorkCitationcampaignurn:org.iodp:exp:178urnlargerWorkCitationcampaignurn:org.iodp:exp:188urnlargerWorkCitationcampaignurn:org.iodp:exp:28urnlargerWorkCitationcampaignEnglishgeoscientificInformation-180.0000180.0000-90.0000-34.0000AntarcticaSouthern Ocean