title: Abrupt change of Antarctic moisture origin at the end of Termination II.
abstract: The deuterium excess of polar ice cores documents past changes in evaporation conditions and moisture origin. New data obtained from the European Project for Ice Coring in Antarctica Dome C East Antarctic ice core provide new insights on the sequence of events involved in Termination II, the transition between the penultimate glacial and interglacial periods. This termination is marked by a north-south seesaw behavior, with first a slow methane concentration rise associated with a strong Antarctic temperature warming and a slow deuterium excess rise. This first step is followed by an abrupt north Atlantic warming, an abrupt resumption of the East Asian summer monsoon, a sharp methane rise, and a CO(2) overshoot, which coincide within dating uncertainties with the end of Antarctic optimum. Here, we show that this second phase is marked by a very sharp Dome C centennial deuterium excess rise, revealing abrupt reorganization of atmospheric circulation in the southern Indian Ocean sector.
authors.affiliation: Laboratoire des Sciences du Climat et de l'Environnement, Institut Pierre Simon Laplace/Commissariat à l'Energie Atomique-Centre National de la Recherche Scientifique-Université Versailles St-Quentin Unité Mixte de Recherche 8212, L'Orme des Merisiers, CEA Saclay, 91191 Gif-sur-Yvette cédex, France. valerie.masson@cea.fr
authors.forename: V
authors.initials: V
authors.lastname: Masson-Delmotte
authors.forename: B
authors.initials: B
authors.lastname: Stenni
authors.forename: T
authors.initials: T
authors.lastname: Blunier
authors.forename: O
authors.initials: O
authors.lastname: Cattani
authors.forename: J
authors.initials: J
authors.lastname: Chappellaz
authors.forename: H
authors.initials: H
authors.lastname: Cheng
authors.forename: G
authors.initials: G
authors.lastname: Dreyfus
authors.forename: R L
authors.initials: RL
authors.lastname: Edwards
authors.forename: S
authors.initials: S
authors.lastname: Falourd
authors.forename: A
authors.initials: A
authors.lastname: Govin
authors.forename: K
authors.initials: K
authors.lastname: Kawamura
authors.forename: S J
authors.initials: SJ
authors.lastname: Johnsen
authors.forename: J
authors.initials: J
authors.lastname: Jouzel
authors.forename: A
authors.initials: A
authors.lastname: Landais
authors.forename: B
authors.initials: B
authors.lastname: Lemieux-Dudon
authors.forename: A
authors.initials: A
authors.lastname: Lourantou
authors.forename: G
authors.initials: G
authors.lastname: Marshall
authors.forename: B
authors.initials: B
authors.lastname: Minster
authors.forename: M
authors.initials: M
authors.lastname: Mudelsee
authors.forename: K
authors.initials: K
authors.lastname: Pol
authors.forename: R
authors.initials: R
authors.lastname: Röthlisberger
authors.forename: E
authors.initials: E
authors.lastname: Selmo
authors.forename: C
authors.initials: C
authors.lastname: Waelbroeck
mesh_terms: D000864:Antarctic Regions; D001267:Atlantic Ocean; D002245:Carbon Dioxide / Q000032:analysis; D002980:Climate; D057231:Climate Change; D003903:Deuterium / Q000032:analysis; D004784:Environmental Monitoring / Q000379:methods; D006116:Greenland; D007053:Ice / Q000032:analysis*; D019156:Indian Ocean; D008697:Methane / Q000032:analysis; D012621:Seasons; D013696:Temperature; D013997:Time Factors
chemical_list: D007053:Ice; D002245:Carbon Dioxide; D003903:Deuterium; D008697:Methane