Additional steady-state simulations of Miocene Antarctic ice-sheet variability using 3D thermodynamical ice-sheet model IMAU-ICE

We supplement our previous dataset (doi:10.1594/PANGAEA.939114), with six additional steady-state simulations of the Miocene Antarctic ice sheet using the reference Miocene settings. IMAU-ICE was run using a 40x40km grid covering the Antarctic continent. Initial conditions were obtained from reconstructions of the Antarctic bathymetry and bedrock topography pertaining to 23 to 24 million years (Myr) ago (dataset doi:10.1594/PANGAEA.923109). The simulations were forced by climate input data obtained from GENESIS simulations with varying CO2 levels (280 to 840 ppm) and Antarctic ice sheet cover (no ice to a large East-Antarctic ice sheet), and with present-day insolation. We utilized a matrix interpolation method to construct the time-varying climate forcing, based on the prescribed CO2 levels and ice cover simulated by IMAU-ICE. For each simulation, we provide the run script, 1D output variables including CO2 level and the sea level contribution of the Antarctic ice sheet, and 3D output variables including ice thickness, bedrock and surface height, surface mass balance, basal mass balance, ice velocities, and ice temperatures. For more information, please contact L.B. Stap at [e-mail].本研究对前期数据集（DOI:10.1594/PANGAEA.939114）进行补充，新增6组基于参考中新世（Miocene）环境设置的中新世南极冰盖（Miocene Antarctic ice sheet）稳态模拟结果。本研究采用覆盖南极大陆的40×40千米网格运行IMAU-ICE模型。模拟初始条件取自距今2300万至2400万年前的南极水深地形与基岩地形重建数据（数据集DOI:10.1594/PANGAEA.923109）。模拟的气候强迫输入数据来自GENESIS模拟结果，该数据集涵盖变化的二氧化碳（CO₂）浓度（280至840 ppm）与南极冰盖覆盖范围（无冰至大型东南极冰盖（East-Antarctic ice sheet）），并以现代日射作为强迫条件。本研究基于预设的CO₂浓度与IMAU-ICE模拟得到的冰盖覆盖情况，采用矩阵插值法（matrix interpolation method）构建时变气候强迫（time-varying climate forcing）场。针对每组模拟，本研究均提供运行脚本、一维（1D）输出变量（包含CO₂浓度与南极冰盖对海平面的贡献量）以及三维（3D）输出变量（包含冰厚、基岩与地表高程、地表质量平衡（surface mass balance）、底部质量平衡（basal mass balance）、冰流速度（ice velocities）与冰体温度（ice temperatures））。如需获取更多信息，请联系L.B. Stap，邮箱：[e-mail]。