Helheim Glacier's Terminus Position Controls Its Seasonal and Inter‐Annual Ice Flow Variability

Helheim Glacier's Terminus Position Controls Its Seasonal and Inter‐Annual Ice Flow Variability
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赫尔海姆冰川的终点位置控制其季节性和年际冰流变化

DOI:
10.1029/2021gl097085
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发表时间:
2021
影响因子:
5.2
通讯作者:
D.S. Cheng
D.S. Cheng
中科院分区:
地球科学1区
文献类型:
--
作者:
G. Cheng;Mathieu Morlighem;J. Mouginot;D.S. Cheng

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在过去的十年里,格陵兰冰盖上总冰流量的最大贡献者之一--赫尔海姆冰川--经历了冰速的大幅波动。在这项研究中,我们使用冰盖和海平面系统模式模拟了从2007年到2020年赫尔海姆的动态,以确定冰流量这些巨大变化的驱动因素。通过量化单个外力和模型参数对Helheim模拟速度的影响,我们发现仅崩解锋面的位置就可以解释冰川的动态变化,因为它对Helheim的冰速有直接和很大的影响。然而,海尔海姆冰川的季节到年际变化对摩擦律或冰流变因子的选择相对不敏感。这项研究表明,需要对冰川崩解动力学和冰海相互作用进行更多的研究,以预测格陵兰岛这一部分的未来。
Over the past decade, one of the largest contributors to total ice discharge across the Greenland ice sheet, Helheim Glacier, has experienced large fluctuations in ice velocity. In this study, we simulate the dynamics of Helheim, from 2007 to 2020, using the Ice‐sheet and Sea‐level System Model to identify the drivers of these large changes in ice discharge. By quantifying the impact of individual external forcing and model parameters on Helheim's modeled velocity, we find that the position of the calving front alone explains the dynamic variability of the glacier, as it has a direct and large impact on Helheim's ice velocity. The seasonal to inter‐annual variability of Helheim Glacier is, however, relatively insensitive to the choice of friction law or ice rheology factor. This study shows that more research on calving dynamics and ice–ocean interactions is required to project the future of this sector of Greenland.
格陵兰东南部赫尔海姆冰川的全新世历史
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