Abstract The Barents Sea Ice Sheet was part of an interconnected complex of ice sheets, collectively referred to as the Eurasian Ice Sheet, which covered north-westernmost Europe, Russia and the Barents Sea during the Last Glacial Maximum (around 21 ky BP). Due to common geological features, the Barents Sea component of this ice complex is seen as a paleo-analogue for the present-day West Antarctic Ice Sheet. Investigating key processes driving the last deglaciation of the Barents Sea Ice Sheet represents an important tool to interpret recent observations in Antarctica over the multi-millennial temporal scale of glaciological changes. We present results from a perturbed physics ensemble of ice sheet model simulations of the last deglaciation of the Barents Sea Ice Sheet, forced with transient atmospheric and oceanic conditions derived from AOGCM simulations. The ensemble of transient simulations is evaluated against the data-based DATED-1 reconstruction to construct minimum, maximum and average deglaciation scenarios. Despite a large model/data mismatch at the western and eastern ice sheet margins, the simulated and DATED-1 deglaciation scenarios agree well on the timing of the deglaciation of the central and northern Barents Sea. We find that the simulated deglaciation of the Barents Sea Ice Sheet is primarily driven by the oceanic forcing, with prescribed eustatic sea level rise amplifying the ice sheet sensitivity to sub-shelf melting over relatively short intervals. Our results highlight that the sub-shelf melting has a very strong control on the simulated grounding-line flux, showing that a slow, gradual ocean warming trend is capable of triggering sustained grounded ice discharge over multi-millennial timescales, even without taking into account marine ice sheet or ice cliff instability.

中文翻译：

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模拟主要由海洋条件驱动的巴伦支海冰盖的最后一次冰消作用

摘要 巴伦支海冰盖是相互连接的冰盖复合体的一部分，统称为欧亚冰盖，在末次盛冰期（约 21 ky BP）期间覆盖了欧洲最西北部、俄罗斯和巴伦支海。由于共同的地质特征，这个冰复合体的巴伦支海部分被视为当今南极西部冰盖的古类似物。调查推动巴伦支海冰盖最后一次冰川消退的关键过程是解释南极洲最近在冰川变化的千年时间尺度上的观测结果的重要工具。我们展示了对巴伦支海冰盖最后一次冰消作用的冰盖模型模拟的扰动物理集合的结果，迫于来自 AOGCM 模拟的瞬态大气和海洋条件。针对基于数据的 DATED-1 重建评估瞬态模拟的集合，以构建最小、最大和平均冰消期情景。尽管西部和东部冰盖边缘存在较大的模型/数据不匹配，但模拟和 DATED-1 冰消期情景在巴伦支海中部和北部冰消期的时间上非常吻合。我们发现巴伦支海冰盖的模拟冰川消融主要是由海洋强迫驱动的，规定的海平面上升在相对较短的时间间隔内放大了冰盖对亚架子融化的敏感性。我们的结果强调，子架熔化对模拟的接地线通量有很强的控制，表明缓慢的，