[M-IS05] 南大洋・南極氷床が駆動する全球気候変動

[MIS05-P15] Numerical experiment of Antarctic ice sheet using a coupled ice-sheet/earth rebound model

*齋藤 冬樹¹、奥野 淳一²、阿部 彩子³ (1.国立研究開発法人海洋研究開発機構、2. 国立極地研究所、3.東京大学大気海洋研究所)

キーワード：氷床、固体地球

Feedback between changes in the ice-sheet and the earth's isostatic rebound is considered to be a crucial process for long-term evolution of the past ice-sheets in glacial cycles, and for short-term instability of marine ice sheets systems. We have been developing a coupled ice-sheet/earth rebound model: the Earth rebound model is based on a self-gravitating visco-elastic multi-layer model developed by Okuno and Nakada (2001), while the ice-sheet model is IcIES (Abe-Ouchi et al. 2013, Saito and Abe-Ouchi 2010, Saito et al 2016). We will report some basic sensitivity studies using the coupled model on Antarctic ice sheet, e.g., for technical aspects such as model resolution. The results are compared with the previous IcIES results coupled with a simple isostatic model (i.e., a local lithosphere/relaxing asthenosphere) which is controlled by two parameters (the mantle density and the time scale of isostatic response). Difference in model sensitivities to changes in environment will be reported.