ABSTRACT Fox Glacier/Te Moeka o Tuawe is a fast-responding maritime glacier that has undergone multiple advance and retreat phases during recent decades. Here we use a combination of repeat photography, Structure from Motion (SfM), and ice discharge measurement, to identify key morphological differences associated with these repeated phase changes, and assess how much of the current terminus is still dynamically active. Increasing surface-debris cover at the margins and topographic shading result in the asymmetry of the retreating terminus, with central portions receding faster than the margins. In 2019, the glacier is shorter than at any time in recorded history, and ice flux is insufficient to sustain the current glacier length, with a further ∼300 m of the glacier terminus region potentially vulnerable to retreat. However, due to the high climate sensitivity of this maritime glacier, even a slight shift towards increasing mass flux could see this trend reverse.

中文翻译：

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海洋冰川在前进和后退阶段的形态变化：Fox Glacier/Te Moeka o Tuawe，新西兰

摘要 Fox Glacier/Te Moeka o Tuawe 是一个快速反应的海洋冰川，近几十年来经历了多个进退阶段。在这里，我们结合使用重复摄影、运动结构 (SfM) 和冰排放测量，来识别与这些重复相变相关的关键形态差异，并评估当前终端有多少仍然处于动态活动状态。增加边缘处的表面碎片覆盖和地形阴影导致后退终点的不对称性，中心部分比边缘退缩得更快。2019 年，冰川比历史上任何时候都短，冰通量不足以维持当前的冰川长度，另外约 300 m 的冰川末端区域可能容易退缩。然而，