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The Southern Ocean and the Antarctic ice sheet are giant reservoirs of heat, water, and materials that play a central role in long-term climate change. This system comprises several sub-systems including the ice shelf, floating icebergs, the seasonal sea ice zone, active biological production, Antarctic bottom water, and the Antarctic Circumpolar Current. These sub-systems interact with each other and have a significant impact on changes in the Earth's environmental system. The aim of this session is to improve understanding of past, present, and future changes in the Antarctic ice sheet and the Southern Ocean through presentations on topics such as paleoenvironmental reconstruction, recent observational studies, and climate modeling. Presentations from students and early-career scientists are welcomed to widen the research community in the field of the Southern Ocean and the Antarctica. The session will facilitate interaction between researchers (including students) studying different sub-systems and research fields, promoting cross-disciplinary discussion. This session is assigned as a Japanese session, but presentations in English are also welcome.