Orbitally induced oscillations in the East Antarctic ice sheet at the Oligocene/Miocene boundary

dc.contributor.authorNaish, Tim
dc.contributor.authorWoolfe, K J
dc.contributor.authorBarrett, Peter
dc.contributor.authorWilson, G.S
dc.contributor.authorAtkins, Cliff
dc.contributor.authorBohaty, S.M
dc.contributor.authorBucker, Christian
dc.contributor.authorClaps, Michele
dc.contributor.authorDavey, Fred
dc.contributor.authorDunbar, Gavin
dc.contributor.authorDunn, Alistair
dc.contributor.authorFielding, C.
dc.contributor.authorFlorindo, Fabio
dc.contributor.authorHannah, M.J
dc.contributor.authorHarnwood, D
dc.contributor.authorHenrys, Stuart
dc.contributor.authorKrissek, Lawrence
dc.contributor.authorLavelle, Mark
dc.contributor.authorvan der Meer , Jaap
dc.contributor.authorMcintosh, William
dc.contributor.authorNiessen, Frank
dc.contributor.authorPasschier, Sandra
dc.contributor.authorPowell, Ross
dc.contributor.authorRoberts, Andrew
dc.contributor.authorSagnotti, Leonardo
dc.contributor.authorScherer, R
dc.contributor.authorStrong, C.P
dc.contributor.authorTalarico, F
dc.contributor.authorVerosub, Kenneth
dc.contributor.authorVilla, Giuliana
dc.contributor.authorWatkins, David
dc.contributor.authorWebb, P-N
dc.contributor.authorWonik, Thomas
dc.date.accessioned2016-02-24T22:42:02Z
dc.date.issued2001
dc.date.updated2016-02-24T11:11:25Z
dc.description.abstractBetween 34 and 15 million years (Myr) ago, when planetary temperatures were 3-4°C warmer than at present and atmospheric CO2 concentrations were twice as high as today, the Antarctic ice sheets may have been unstable. Oxygen isotope records from deep-sea sediment cores suggest that during this time fluctuations in global temperatures and high-latitude continental ice volumes were influenced by orbital cycles. But it has hitherto not been possible to calibrate the inferred changes in ice volume with direct evidence for oscillations of the Antarctic ice sheets. Here we present sediment data from shallow marine cores in the western Ross Sea that exhibit well dated cyclic variations, and which link the extent of the East Antarctic ice sheet directly to orbital cycles during the Oligocene/Miocene transition (24.1-23.7 Myr ago). Three rapidly deposited glacimarine sequences are constrained to a period of less than 450 kyr by our age model, suggesting that orbital influences at the frequencies of obliquity (40 kyr) and eccentricity (125 kyr) controlled the oscillations of the ice margin at that time. An erosional hiatus covering 250 kyr provides direct evidence for a major episode of global cooling and ice-sheet expansion about 23.7 Myr ago, which had previously been inferred from oxygen isotope data (Mil event).
dc.identifier.issn0028-0836
dc.identifier.urihttp://hdl.handle.net/1885/98911
dc.publisherMacmillan Publishers Ltd
dc.sourceNature
dc.subjectKeywords: Atmospheric composition; Atmospheric temperature; Carbon dioxide; Climate change; Sediments; Orbital oscillations; Sea ice; carbon dioxide; ice; oxygen; ice sheet; mass balance; Miocene; Oligocene; orbital forcing; article; astronomy; atmosphere; calibrat
dc.titleOrbitally induced oscillations in the East Antarctic ice sheet at the Oligocene/Miocene boundary
dc.typeJournal article
local.bibliographicCitation.issue6857
local.bibliographicCitation.lastpage723
local.bibliographicCitation.startpage719
local.contributor.affiliationNaish, Tim, Institute of Geological and Nuclear Sciences
local.contributor.affiliationWoolfe, K J, James Cook University
local.contributor.affiliationBarrett, Peter, Victoria University of Wellington
local.contributor.affiliationWilson, G.S, University of Oxford
local.contributor.affiliationAtkins, Cliff, Victoria University of Wellington
local.contributor.affiliationBohaty, S.M, University of Nebraska
local.contributor.affiliationBucker, Christian, Institute of Geosciences
local.contributor.affiliationClaps, Michele, Universita degli Studi di Ancona
local.contributor.affiliationDavey, Fred, Institue of Geological and Nuclear Sciences
local.contributor.affiliationDunbar, Gavin, Victoria University of Wellington
local.contributor.affiliationDunn, Alistair, National Institute of Water and Atmospheric Research
local.contributor.affiliationFielding, C., University of Queensland
local.contributor.affiliationFlorindo, Fabio, Instituto Nazionale di Geofisica e Vulcanologia
local.contributor.affiliationHannah, M.J, Victoria University of Wellington
local.contributor.affiliationHarnwood, D, University of Nebraska
local.contributor.affiliationHenrys, Stuart, NZ Institute of Geological and Nuclear Sciences
local.contributor.affiliationKrissek, Lawrence, Ohio State University
local.contributor.affiliationLavelle, Mark, University of Cambridge
local.contributor.affiliationvan der Meer , Jaap, University of Amsterdam
local.contributor.affiliationMcintosh, William, New Mexico Institute of Mining and Technology
local.contributor.affiliationNiessen, Frank, Alfred Wegener Institute for Polar and Marine Research
local.contributor.affiliationPasschier, Sandra, Ohio State University
local.contributor.affiliationPowell, Ross, Northern Illinois University
local.contributor.affiliationRoberts, Andrew, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationSagnotti, Leonardo, Instituto Nazionale di Geofisica e Vulcanologia
local.contributor.affiliationScherer, R, Northern Illinois University
local.contributor.affiliationStrong, C.P, Institute of Geological and Nuclear Sciences
local.contributor.affiliationTalarico, F, Universita di Siena
local.contributor.affiliationVerosub, Kenneth, University of California
local.contributor.affiliationVilla, Giuliana, University di Parma
local.contributor.affiliationWatkins, David, University of Nebraska
local.contributor.affiliationWebb, P-N, Ohio State University
local.contributor.affiliationWonik, Thomas, Institute of Geosciences
local.contributor.affiliationDunbar, Gavin, College of Physical and Mathematical Sciences, ANU
local.contributor.authoremailu4817957@anu.edu.au
local.contributor.authoruidRoberts, Andrew, u4817957
local.contributor.authoruidDunbar, Gavin, u4066395
local.description.embargo2037-12-31
local.description.notesImported from ARIES
local.identifier.absfor040406 - Magnetism and Palaeomagnetism
local.identifier.ariespublicationu4539375xPUB80
local.identifier.citationvolume413
local.identifier.doi10.1038/35099534
local.identifier.scopusID2-s2.0-0035909255
local.identifier.uidSubmittedByu4539375
local.type.statusPublished Version

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