Determining the sensitivity of the Greenland Ice Sheet (GrIS) to Holocene climate changes is a key prerequisite for understanding the future response of the ice sheet to global warming. In this study, we present new information on the Holocene glacial history of the GrIS in Inglefield Land, north Greenland. We use ¹⁰Be and in situ ¹⁴C exposure dating to constrain the timing of deglaciation in the area and radiocarbon dating of reworked molluscs and wood fragments to constrain when the ice sheet retreated behind its present-day extent. The ¹⁰Be ages are scattered ranging from ca. 92.7 to 6.8 ka, whereas the in situ ¹⁴C ages range from ca. 14.2 to 6.7 ka. Almost half of the apparent ¹⁰Be ages predate the Last Glacial Maximum and up to 89 % are to some degree affected by nuclide inheritance. Based on the few reliable ¹⁰Be ages, the in situ ¹⁴C ages and existing radiocarbon ages from Inglefield Land, we find that the deglaciation along the coast commenced at ca. 8.6–8.3 ka cal BP in the western part and ca. 7.9 ka in the central part, following the opening of Nares Strait and arrival of warm waters. The ice margin reached its present-day position at ca. 8.2 ka at the Humboldt Glacier and ca. 6.7 ka in the central part of Inglefield Land. Radiocarbon ages of reworked molluscs and wood fragments show that the ice margin was behind its present-day extent from ca. 5.8 to 0.5 ka cal BP. After 0.5 ka cal BP, the ice advanced towards its Little Ice Age position. Our results emphasize that the slowly eroding and possibly cold-based ice in north Greenland makes it difficult to constrain the deglaciation history based on ¹⁰Be ages alone unless they are paired with in situ ¹⁴C ages. Further, combining our findings with those of recently published studies reveals distinct differences between deglaciation patterns of northwest and north Greenland. Deglaciation of the land areas in northwest Greenland occurred earlier than in north Greenland, and periods of restricted ice extent were longer, spanning the Middle and Late Holocene. Overall, this highlights past ice sheet sensitivity to Holocene climate changes in an area where little information was available just a few years ago.

中文翻译：

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Inglefield土地的冰川历史，北格陵兰岛的结合原位¹⁰ Be和¹⁴ C曝光约会

确定格陵兰冰原（GrIS）对全新世气候变化的敏感性是了解冰原对全球变暖未来反应的关键前提。在这项研究中，我们提供了格陵兰岛格陵兰群岛全新世冰川历史的新信息。我们使用¹⁰ Be和原位¹⁴ C暴露年代来约束该地区的冰消时间，并限制重新加工的软体动物和木材碎片的放射性碳年代来限制冰盖退回到当前范围之后的时间。在^10名铍年龄散布范围从约 92.7至6.8 ka，而原位¹⁴ C年龄范围大约为。14.2至6.7 ka。表观^10的几乎一半年龄要比最后冰川期早，并且高达89％在​​一定程度上受核素遗传的影响。基于可靠的¹⁰ Be年龄，原位¹⁴从英格尔菲尔德土地的C年龄和现有的放射性碳年龄开始，我们发现沿海岸的冰消作用始于约。西部和大约8.6–8.3 ka cal BP。纳里斯海峡（Nares Strait）开放和温暖水域到来之后，中部7.9 ka。冰缘达到目前的位置，约为 洪堡冰川约8.2 ka，英格菲尔德地区中部6.7 ka。重做的软体动物和木材碎片的放射性碳年龄表明，冰缘距今天大约在大约50摄氏度的范围内。5.8至0.5 ka cal BP。在0.5 ka cal BP之后，冰向其小冰河时代位置前进。我们的结果强调，格陵兰岛北部的冰层正在缓慢侵蚀，甚至可能是寒冷的冰层，因此很难根据¹⁰除非它们与原位¹⁴ C年龄配对，否则应单独年龄。此外，将我们的发现与最近发表的研究相结合，揭示了西北格陵兰岛和北部格陵兰岛的冰消模式之间的明显差异。格陵兰岛西北部的土地冰消融发生早于格陵兰岛北部，并且受冰范围限制的时间更长，跨越了中全新世。总体而言，这突显了过去几年冰盖对全新世气候变化的敏感性，而该地区几年前尚无相关信息。