尽管基底融化率较低,但裂谷扩展预示着斯怀兹东部冰架的最后一幕

IF 2.8 3区 地球科学 Q2 GEOGRAPHY, PHYSICAL
Christian T. Wild, Samuel B. Kachuck, Adrian Luckman, Karen E. Alley, Meghan A. Sharp, Haylee Smith, Scott W. Tyler, Christopher Kratt, Tiago S. Dotto, Daniel Price, Keith W. Nicholls, Suzanne L. Bevan, Gabriela Collao-Barrios, Atsuhiro Muto, Martin Truffer, Ted A. Scambos, Karen J. Heywood, Erin C. Pettit, the TARSAN team
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引用次数: 0

摘要

裂谷扩展,而非基底融化,是导致斯怀兹东部冰架不稳定和解体的原因。自 2016 年以来,裂口在整个冰架中央区域偶发推进,快速扩展事件发生在澳大利亚春季。在此期间,冰架的速度增加了约 70%,中部地区的速度从 2019 年的 1.65 米/天过渡到 2023 年初的 2.85 米/天。自 2020 年以来,接地带附近纵向应变率的增加导致了全厚度裂缝和熔岩填充间隙。最近的一次海冰断裂加速了西部断裂前沿的退缩,有效地将冰架从其西北销点的剩余部分分离出来。与此同时,一组分布式相位敏感雷达测量结果表明,基底融化率普遍较小,这可能是由于冰洋交界处下方广泛存在的强大海洋分层,尽管深海存在大量海洋热量,但仍抑制了基底融化。这些观测结果与破坏模型相结合表明,虽然海洋作用力是引发当前南极西部冰层退缩的原因,但在十年时间尺度上,斯韦思东部冰架正在经历动态反馈,这种反馈正在推动冰架解体,现在与基底融化无关。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Rift propagation signals the last act of the Thwaites Eastern Ice Shelf despite low basal melt rates

Rift propagation, rather than basal melt, drives the destabilization and disintegration of the Thwaites Eastern Ice Shelf. Since 2016, rifts have episodically advanced throughout the central ice-shelf area, with rapid propagation events occurring during austral spring. The ice shelf's speed has increased by ~70% during this period, transitioning from a rate of 1.65 m d−1 in 2019 to 2.85 m d−1 by early 2023 in the central area. The increase in longitudinal strain rates near the grounding zone has led to full-thickness rifts and melange-filled gaps since 2020. A recent sea-ice break out has accelerated retreat at the western calving front, effectively separating the ice shelf from what remained of its northwestern pinning point. Meanwhile, a distributed set of phase-sensitive radar measurements indicates that the basal melting rate is generally small, likely due to a widespread robust ocean stratification beneath the ice–ocean interface that suppresses basal melt despite the presence of substantial oceanic heat at depth. These observations in combination with damage modeling show that, while ocean forcing is responsible for triggering the current West Antarctic ice retreat, the Thwaites Eastern Ice Shelf is experiencing dynamic feedbacks over decadal timescales that are driving ice-shelf disintegration, now independent of basal melt.

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来源期刊
Journal of Glaciology
Journal of Glaciology 地学-地球科学综合
CiteScore
5.80
自引率
14.70%
发文量
101
审稿时长
6 months
期刊介绍: Journal of Glaciology publishes original scientific articles and letters in any aspect of glaciology- the study of ice. Studies of natural, artificial, and extraterrestrial ice and snow, as well as interactions between ice, snow and the atmospheric, oceanic and subglacial environment are all eligible. They may be based on field work, remote sensing, laboratory investigations, theoretical analysis or numerical modelling, or may report on newly developed glaciological instruments. Subjects covered recently in the Journal have included palaeoclimatology and the chemistry of the atmosphere as revealed in ice cores; theoretical and applied physics and chemistry of ice; the dynamics of glaciers and ice sheets, and changes in their extent and mass under climatic forcing; glacier energy balances at all scales; glacial landforms, and glaciers as geomorphic agents; snow science in all its aspects; ice as a host for surface and subglacial ecosystems; sea ice, icebergs and lake ice; and avalanche dynamics and other glacial hazards to human activity. Studies of permafrost and of ice in the Earth’s atmosphere are also within the domain of the Journal, as are interdisciplinary applications to engineering, biological, and social sciences, and studies in the history of glaciology.
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