HR: 13:55h
AN: U23A-02 INVITED     [Abstracts]
TI: A High Resolution Isotopic ice Core Record Covering the Last 800 000 Years.
AU: * Jouzel, J
EM: jouzel@lsce.saclay.cea.fr
AF: IPSL/ Laboratoire des Sciences du Climat et de l'Environnement, Orme des merisiers, Gif sur Yvette, 91191 France
AU: Cattani, O
EM: cattani@lsce.saclay.cea.fr
AF: IPSL/ Laboratoire des Sciences du Climat et de l'Environnement, Orme des merisiers, Gif sur Yvette, 91191 France
AU: Dreyfus, G
EM: dreyfus@lsce.saclay.cea.fr
AF: IPSL/ Laboratoire des Sciences du Climat et de l'Environnement, Orme des merisiers, Gif sur Yvette, 91191 France
AU: Falourd, S
EM: falourd@lsce.saclay.cea.fr
AF: IPSL/ Laboratoire des Sciences du Climat et de l'Environnement, Orme des merisiers, Gif sur Yvette, 91191 France
AU: MAsson-Delmotte, V
EM: masson@lsce.saclay.cea.fr
AF: IPSL/ Laboratoire des Sciences du Climat et de l'Environnement, Orme des merisiers, Gif sur Yvette, 91191 France
AU: Nouet, J
EM: nouet@lsce.saclay.cea.fr
AF: IPSL/ Laboratoire des Sciences du Climat et de l'Environnement, Orme des merisiers, Gif sur Yvette, 91191 France
AU: Oerter, H
AF: Alfred Wegener Institute, Postfach 120161, Bremerhaven, 27515 Germany
AU: Johnsen, S
EM: sigfus@mail.gfy.ku.dk
AF: Department of Geophysics, Juliane Maries Vej 30, Copenhagen, 2100 Denmark
AU: Parrenin, F
EM: Frederic.Parrenin@notos.cst.cnes.fr
AF: Laboratoire de Glaciologie et G‚ophysique de l'Environnement, 5' Rue MoliŠre, St Martin d'Heres, 38402 France
AU: Stenni, B
EM: stenni@univ.trieste.it
AF: Dept. of Geological, Environmental and Marine Sciences, University of Trieste, Trieste, 34127 Italy
AB: The two cores drilled at the Dome C site in East Antarctica (elevation 3233 m, mean annual temperature, - 54.5øC) in the framework of the European Program for Ice Coring in Antarctica, now provide a continuous deuterium profile covering the last 800 ky. Thanks to a recent extension over its last 60 meters, the 3201 m Antarctic climate record now extends back to marine stage 20. Whereas published data (EPICA Community members, 2004) are of low temporal resolution (e.g. 3000 years), we will have at the time of the meeting a much more detailed deuterium profile to present, at least for most of the core. We will first discuss the EPICA profile in view of existing East Antarctic ice core records (Vostok and Dome F) and its temperature interpretation. This comparison will also include the results from the second EPICA core drilled at Kohnen Station in the Atlantic sector of East Antarctica, available at that time. We will then focus on the spectral properties of the 800 ky climate record and on its comparison with marine records. Of particular interest are the change of pacing before and after the MBE (Mid-Brunhes Event) and the timing and duration of stadials, interstadials, and interglacials which will lead us to discuss how the EPICA timescale was derived. Particular attention will be paid to the last glacial cycle, for which the EPICA deuterium record shows counterparts for each of the successive Dansgaard/Oeschger events, both for large and small ones, with possible implications for the seesaw mechanism.
DE: 3344 Paleoclimatology
DE: 4267 Paleoceanography
DE: 1600 GLOBAL CHANGE (New category)
SC: Union [U]
MN: 2004 AGU Fall Meeting