title: Eight glacial cycles from an Antarctic ice core.
abstract: The Antarctic Vostok ice core provided compelling evidence of the nature of climate, and of climate feedbacks, over the past 420,000 years. Marine records suggest that the amplitude of climate variability was smaller before that time, but such records are often poorly resolved. Moreover, it is not possible to infer the abundance of greenhouse gases in the atmosphere from marine records. Here we report the recovery of a deep ice core from Dome C, Antarctica, that provides a climate record for the past 740,000 years. For the four most recent glacial cycles, the data agree well with the record from Vostok. The earlier period, between 740,000 and 430,000 years ago, was characterized by less pronounced warmth in interglacial periods in Antarctica, but a higher proportion of each cycle was spent in the warm mode. The transition from glacial to interglacial conditions about 430,000 years ago (Termination V) resembles the transition into the present interglacial period in terms of the magnitude of change in temperatures and greenhouse gases, but there are significant differences in the patterns of change. The interglacial stage following Termination V was exceptionally long--28,000 years compared to, for example, the 12,000 years recorded so far in the present interglacial period. Given the similarities between this earlier warm period and today, our results may imply that without human intervention, a climate similar to the present one would extend well into the future.
authors.affiliation: Laboratoire de Glaciologie et Géophysique de l'Environnement, CNRS, BP 96, 38402 St Martin d'Hères Cedex, France.
authors.forename: Laurent
authors.initials: L
authors.lastname: Augustin
authors.forename: Carlo
authors.initials: C
authors.lastname: Barbante
authors.forename: Piers R F
authors.initials: PR
authors.lastname: Barnes
authors.forename: Jean Marc
authors.initials: JM
authors.lastname: Barnola
authors.forename: Matthias
authors.initials: M
authors.lastname: Bigler
authors.forename: Emiliano
authors.initials: E
authors.lastname: Castellano
authors.forename: Olivier
authors.initials: O
authors.lastname: Cattani
authors.forename: Jerome
authors.initials: J
authors.lastname: Chappellaz
authors.forename: Dorthe
authors.initials: D
authors.lastname: Dahl-Jensen
authors.forename: Barbara
authors.initials: B
authors.lastname: Delmonte
authors.forename: Gabrielle
authors.initials: G
authors.lastname: Dreyfus
authors.forename: Gael
authors.initials: G
authors.lastname: Durand
authors.forename: Sonia
authors.initials: S
authors.lastname: Falourd
authors.forename: Hubertus
authors.initials: H
authors.lastname: Fischer
authors.forename: Jacqueline
authors.initials: J
authors.lastname: Flückiger
authors.forename: Margareta E
authors.initials: ME
authors.lastname: Hansson
authors.forename: Philippe
authors.initials: P
authors.lastname: Huybrechts
authors.forename: Gérard
authors.initials: G
authors.lastname: Jugie
authors.forename: Sigfus J
authors.initials: SJ
authors.lastname: Johnsen
authors.forename: Jean
authors.initials: J
authors.lastname: Jouzel
authors.forename: Patrik
authors.initials: P
authors.lastname: Kaufmann
authors.forename: Josef
authors.initials: J
authors.lastname: Kipfstuhl
authors.forename: Fabrice
authors.initials: F
authors.lastname: Lambert
authors.forename: Vladimir Y
authors.initials: VY
authors.lastname: Lipenkov
authors.forename: Geneviève C
authors.initials: GC
authors.lastname: Littot
authors.forename: Antonio
authors.initials: A
authors.lastname: Longinelli
authors.forename: Reginald
authors.initials: R
authors.lastname: Lorrain
authors.forename: Valter
authors.initials: V
authors.lastname: Maggi
authors.forename: Valerie
authors.initials: V
authors.lastname: Masson-Delmotte
authors.forename: Heinz
authors.initials: H
authors.lastname: Miller
authors.forename: Robert
authors.initials: R
authors.lastname: Mulvaney
authors.forename: Johannes
authors.initials: J
authors.lastname: Oerlemans
authors.forename: Hans
authors.initials: H
authors.lastname: Oerter
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Orombelli
authors.forename: Frederic
authors.initials: F
authors.lastname: Parrenin
authors.forename: David A
authors.initials: DA
authors.lastname: Peel
authors.forename: Jean-Robert
authors.initials: JR
authors.lastname: Petit
authors.forename: Dominique
authors.initials: D
authors.lastname: Raynaud
authors.forename: Catherine
authors.initials: C
authors.lastname: Ritz
authors.forename: Urs
authors.initials: U
authors.lastname: Ruth
authors.forename: Jakob
authors.initials: J
authors.lastname: Schwander
authors.forename: Urs
authors.initials: U
authors.lastname: Siegenthaler
authors.forename: Roland
authors.initials: R
authors.lastname: Souchez
authors.forename: Bernhard
authors.initials: B
authors.lastname: Stauffer
authors.forename: Jorgen Peder
authors.initials: JP
authors.lastname: Steffensen
authors.forename: Barbara
authors.initials: B
authors.lastname: Stenni
authors.forename: Thomas F
authors.initials: TF
authors.lastname: Stocker
authors.forename: Ignazio E
authors.initials: IE
authors.lastname: Tabacco
authors.forename: Roberto
authors.initials: R
authors.lastname: Udisti
authors.forename: Roderik S W
authors.initials: RS
authors.lastname: Van De Wal
authors.forename: Michiel
authors.initials: M
authors.lastname: Van Den Broeke
authors.forename: Jerome
authors.initials: J
authors.lastname: Weiss
authors.forename: Frank
authors.initials: F
authors.lastname: Wilhelms
authors.forename: Jan-Gunnar
authors.initials: JG
authors.lastname: Winther
authors.forename: Eric W
authors.initials: EW
authors.lastname: Wolff
authors.forename: Mario
authors.initials: M
authors.lastname: Zucchelli