[M-IS14] 南大洋・南極氷床が駆動する全球気候変動

[MIS14-P20] Development of a coupled ice-sheet/earth rebound model for Antarctic ice-sheet simulation

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

キーワード：南極氷床、氷床モデル、固体地球モデル

Feedback between changes in the ice-sheet and the earth's isostatic rebound is considered to be an important process for the evolution of the past ice-sheets in glacial cycles. We have been developing a coupled ice-sheet/earth rebound model which were applied for northern hemisphere ice sheet simulation during glacial/interglacial cycles. 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 2013). The results are compared with the previous IcIES results which coupled with a simple isostatic model (i.e., a local lithosphere/relaxing asthenosphere) which is controled by two parameters (the mantle density and the time scale of isostatic response), in order to discuss the effect of more realistic visco-elastic structure of the earth.