[A-CC32_29PM2] 氷床・氷河コアと古環境変動

★ [ACC32-13] 3次元氷床力学モデルより求められた氷床融解史に基づくグリーンランドにおける第四紀海水準変動と地殻変動

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

キーワード：グリーンランド氷床, 海水準変動, 地殻変動, アイソスタシー

We study the implications of a recently published ice sheet history in Northern hemisphere and Greenland ice sheet, derived from the 3D thermo-mechanical ice sheet model (Ice Sheet for Integrated Earth system Studies: IcIES developed by Abe-Ouchi et al. 2013). To characterize the effects of this glaciologically consistent ice sheet history, we examine the time-variations of various geophysical quantities in response to the ice and water mass redistributions. They include vertical uplift and subsidence, global patterns of sea-level change, and regional sea-level variations along the coasts of Greenland. Relative sea-level (RSL) changes in response to past ice and water load variations are obtained solving the sea-level equation, which accounts for the crustal deformation due to glacio-isostatic adjustment (GIA). In this study, we report the predictions of RSL and geodetic signals in Greenland induced by GIA process based on the glaciologically and climatologically consistent ice loading history. And also, we show the temporal and spatial characteristics of predicted geophysical signals in Greenland in comparison with these observations. We expect that using the ice sheet histories derived from IcIES as input in GIA model may put better constraints on postglacial rebound and current rates of crustal deformation.