Rapid glacier retreat rates observed in West Antarctica
Rapid glacier retreat rates observed in West Antarctica
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DOI：
10.1038/s41561-021-00877-z
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发表时间：
2022-01
影响因子：
18.3
通讯作者：
P. Milillo;E. Rignot;P. Rizzoli;B. Scheuchl;J. Mouginot;J. Bueso-Bello;P. Prats-Iraola;L. Dini
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文献类型：
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作者：
P. Milillo;E. Rignot;P. Rizzoli;B. Scheuchl;J. Mouginot;J. Bueso-Bello;P. Prats-Iraola;L. Dini
南极洲西部阿蒙森海湾的波普、史密斯和科勒冰川在过去30年里经历了海洋引起的冰架融化、冰川加速、冰变薄和接地线后退的加剧。在这里，我们提出了自2014年以来使用干涉雷达卫星星座结合精确的表面高程数据对这些冰川的接地线退缩的观测。我们发现，接地线发展空间可变，尺度，潮汐诱导的迁移区。潮汐效应校正后，我们检测到一个持续的撤退模式与高融化率的不接地冰，标志着更快速撤退的插曲。2017年，波普冰川在3.6个月内退缩了3.5公里，即11.7公里/年。在2016-2018年，Smith West以2 km yr-1的速度后退，科勒以1.3 km yr-1的速度后退。虽然2018-2020年的撤退速度放缓，但这些撤退速度比每年时间尺度的数值模型预期的要快。我们推测，快速撤退是由未代表的，有力的冰-海洋相互作用在冰-海洋边界新形成的空腔内。
The Pope, Smith and Kohler glaciers, in the Amundsen Sea Embayment of West Antarctica, have experienced enhanced ocean-induced ice-shelf melt, glacier acceleration, ice thinning and grounding-line retreat in the past 30 years. Here we present observations of the grounding-line retreat of these glaciers since 2014 using a constellation of interferometric radar satellites combined with precision surface elevation data. We find that the grounding lines develop spatially variable, kilometre-scale, tidally induced migration zones. After correction for tidal effects, we detect a sustained pattern of retreat coincident with high melt rates of ungrounded ice, marked by episodes of more rapid retreat. In 2017, Pope Glacier retreated 3.5 km in 3.6 months, or 11.7 km yr–1. In 2016–2018, Smith West retreated at 2 km yr–1and Kohler at 1.3 km yr–1. While the retreat slowed in 2018–2020, these retreat rates are faster than anticipated by numerical models on yearly timescales. We hypothesize that the rapid retreat is caused by unrepresented, vigorous ice–ocean interactions acting within newly formed cavities at the ice–ocean boundary.