[M-IS05] Global climate change driven by the Southern Ocean and the Antarctic Ice Sheet

[MIS05-P09] Climatic and atmospheric changes over the last three Terminations from O₂/N₂,d¹⁸O_atm and CH₄ records of the Dome Fuji ice core, Antarctica

*Ikumi Oyabu¹, Kenji Kawamura^1,2,3, Kyotaro Kitamura¹, Anais Orsi⁴, Frederic Parrenin⁵, Christo Buizert⁶ (1.National Institute of Polar Research, Research Organization of Information and Systems, 2.SOKENDAI (The Graduate University of Advanced Studies), 3.Japan Agency for Marine Science and Technology (JAMSTEC), 4.Laboratory for Sciences of Climate and Environment (LSCE), 5.Institut des Géosciences de l’Environnement (IGE), 6.Oregon State University)

Keywords:ice core, degraciation, Antarctica

Understanding the mechanisms of glacial terminations and associated global climatic changes is an important area of paleoclimatic research, because the terminations involve various interactions between the atmosphere, ocean, ice, and solid earth over multiple timescales. However, the climatic variations for the older terminations than the last one are relatively poorly reconstructed because of the limitations of available paleoclimatic proxies, time resolution, and chronological controls. Here, we revise the Dome Fuji chronology using newly measured O₂/N₂ ratio (a proxy of local summer insolation) combined with densification modeling and ice flow modeling, and discuss the timing of climatic and atmospheric variations including abrupt changes for Termination I, II and III, based on the records of CH₄ concentrations and δ¹⁸O of O₂ in the Dome Fuji ice core.