Dome F and Vostok deuterium excess reveal homogeneous variations in East Antarctica moisture origin at orbital scale

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.