HR: 1340h
AN: PP33C-1585 [Abstracts]
TI: Dome F and Vostok deuterium excess reveal homogeneous variations in East Antarctica moisture origin at
orbital scale
AU: * Vimeux, F
EM: vimeux@lsce.saclay.cea.fr
AF: LSCE, CE Saclay, Orme des Merisiers, Bat 701, Gif-sur-Yvette, 91191
France
AU: Uemura, R
EM: ruemura@pmg.nipr.ac.jp
AF: National Institute of Polar Research, 1-9-10, Kaga, Itabashi-ku, Tokyo, 173-8515
Japan
AU: Yoshida, N
EM: naoyoshi@depe.titech.ac.jp
AF: Tokyo Institute of Technology, 4259 Nagatsuta, Yokohama, 226-8502
Japan
AU: Jouzel, J
EM: jouzel@lsce.saclay.cea.fr
AF: LSCE, CE Saclay, Orme des Merisiers, Bat 701, Gif-sur-Yvette, 91191
France
AU: Watanabe, O
EM: watanabe@pmg.nipr.ac.jp
AF: National Institute of Polar Research, 1-9-10, Kaga, Itabashi-ku, Tokyo, 173-8515
Japan
AU: Kageyama, M
EM: masa@lsce.saclay.cea.fr
AF: LSCE, CE Saclay, Orme des Merisiers, Bat 701, Gif-sur-Yvette, 91191
France
AB:
Deuterium excess (d) in polar ice cores is now of a widespread use to reconstruct temperature variations at the oceanic
moisture source. At glacial-interglacial timescale, only two deuterium excess profiles are available at Vostok and Dome Fuji
in East Antarctica. Those two sites of snow deposition undergo very different moisture origin. Dome F is located in the
Atlantic sector whereas Vostok mainly receives moisture from the Indian ocean. In this context, we explore here the
similarities between the two profiles regarding the Vostok d interpretation involving obliquity as a key parameter in
controling the meridional ocean temperature gradient variations. We further explore this obliquity impact by discussing new
simulations done with an intermediate complexity model (CLIMBER). We also examine differences between the two d profiles in
order to estimate potential local and specific effects on deuterium excess. Especially, we discuss the Vostok d feature
before 250 ka.
DE: 0454 Isotopic composition and chemistry (1041, 4870)
DE: 0724 Ice cores (4932)
DE: 1616 Climate variability (1635, 3305, 3309, 4215, 4513)
DE: 1620 Climate dynamics (0429, 3309)
DE: 4932 Ice cores (0724)
SC: Paleoceanography and Paleoclimatology [PP]
MN: Fall Meeting 2005