Greenland glaciers exhibit variable seasonal velocity signals that may reflect differences in subglacial hydrology. Here, we conduct a first GrIS-wide glacier classification based on seasonal velocity patterns derived from 2017 Sentinel-1 radar data. Our classification focuses on two distinct seasonal ice velocity patterns, with the first (type-2 from Moon and others, 2014) showing periods of both speedup and slowdown during the melt season, and the second (type-3) instead showing a longer period of slowdown from elevated velocities in the winter and spring. We analyze 221 glaciers in 2017 and show that 48 exhibit type-2 behavior, and 72 exhibit type-3 behavior. We extend the classification to 2018 and 2019 and find that while the glaciers meeting each criterion vary year to year, type-2 is consistently more common in the northern regions and type-3 is more common in the south. Our results highlight the varied impact of meltwater on subglacial drainage systems and glacier flow in Greenland.

中文翻译：

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基于两种不同的季节性冰速行为的格陵兰冰盖宽冰川分类

格陵兰冰川表现出可变的季节性速度信号，这可能反映了冰下水文的差异。在这里，我们基于从 2017 Sentinel-1 雷达数据中得出的季节性速度模式进行了第一次 GrIS 范围内的冰川分类。我们的分类侧重于两种不同的季节性冰速模式，第一种（来自 Moon 和其他人，2014 年的 2 型）显示融化季节期间加速和减速的时期，而第二种（3 型）则显示更长的时期冬季和春季由于速度加快而减速。我们分析了 2017 年的 221 座冰川，发现 48 座冰川表现出 2 型行为，72 座冰川表现出 3 型行为。我们将分类扩展到 2018 年和 2019 年，发现虽然满足每个标准的冰川每年都有所不同，2 型在北部地区更常见，3 型在南部地区更常见。我们的研究结果突出了融水对格陵兰冰下排水系统和冰川流动的不同影响。