Abstract New high-resolution multibeam bathymetry and sub-bottom profile datasets from Fingerdjupet are used for the first detailed geomorphological mapping of the seafloor in this area. The mapped landforms provide evidence for a palaeo-ice stream flowing in a southeasterly direction from Spitsbergenbanken into Fingerdjupet, merging with Bjornoyrenna ice stream, and confirm a theorised palaeo-ice divide located along the bank. The combined landform records and acoustic stratigraphy allow a detailed reconstruction of the glacial dynamics during the last deglaciation. The withdrawal of the Fingerdjupet ice stream from Bjornoyrenna was characterised by rapid retreat, punctuated by periods of stable ice marginal conditions. Five to six major ice margin stillstands and/or readvances associated with the last deglaciation are identified in the seafloor record and acoustic stratigraphy. During these events, large grounding zone wedges were deposited at the ice stream margin. The seabed geomorphology indicates that ice stream dynamics changed as the ice stream retreated from the trough onto the shallower bank. Here, numerous retreat moraines indicate that a grounded ice margin retreated slowly, with several minor stillstands, towards north-northwest. Several controls and/or drivers on the style of ice flow and retreat have been suggested, including catchment size reduction, sea level rise, bedrock topography, drawdown of bank ice and/or migration of the main ice divide over the bank.

中文翻译：

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西巴伦支海fingerdjupet海槽的冰川动力学和冰消退模式

摘要 来自 Fingerdjupet 的新高分辨率多波束测深和海底剖面数据集被用于该地区海底的首次详细地貌测绘。绘制的地形图提供了从 Spitsbergenbanken 向东南方向流入 Fingerdjupet 的古冰流与 Bjornoyrenna 冰流合并的证据，并证实了沿河岸存在的理论古冰分界。结合地貌记录和声学地层学，可以详细重建最后一次冰消期间的冰川动力学。Fingerdjupet 冰流从 Bjornoyrenna 撤出的特点是快速撤退，偶尔会出现稳定的冰边缘条件。在海底记录和声学地层学中确定了五到六个主要的冰缘残骸和/或与上次冰消期相关的读数。在这些事件中，大的接地带楔形物沉积在冰流边缘。海底地貌表明，随着冰流从海槽退回到较浅的河岸，冰流动力学发生了变化。在这里，大量的后退冰碛表明，一个接地的冰缘缓慢地向西北偏北方向后退，有几个小冰碛。已经提出了几种控制和/或驱动冰流和退缩方式的建议，包括流域面积减小、海平面上升、基岩地形、堤岸冰的下降和/或堤岸上主要冰分水岭的迁移。大的接地带楔形物沉积在冰流边缘。海底地貌表明，随着冰流从海槽退回到较浅的河岸，冰流动力学发生了变化。在这里，大量的退缩冰碛表明，一个接地的冰缘缓慢退缩，有几个小冰碛，向西北偏北方向退缩。已经提出了几种控制和/或驱动冰流和退缩方式的建议，包括流域面积减小、海平面上升、基岩地形、堤岸冰的下降和/或堤岸上主要冰分水岭的迁移。大的接地带楔形物沉积在冰流边缘。海底地貌表明，随着冰流从海槽退回到较浅的河岸，冰流动力学发生了变化。在这里，大量的退缩冰碛表明，一个接地的冰缘缓慢退缩，有几个小冰碛，向西北偏北方向退缩。已经提出了几种控制和/或驱动冰流和退缩方式的建议，包括流域面积减小、海平面上升、基岩地形、堤岸冰的下降和/或堤岸上主要冰分水岭的迁移。有几个小的静物架，朝向西北偏北。已经提出了几种控制和/或驱动冰流和退缩方式的建议，包括流域面积减小、海平面上升、基岩地形、堤岸冰的下降和/或堤岸上主要冰分水岭的迁移。有几个小的静物架，朝向西北偏北。已经提出了几种控制和/或驱动冰流和退缩方式的建议，包括流域面积减小、海平面上升、基岩地形、堤岸冰的下降和/或堤岸上主要冰分水岭的迁移。