周期性的海面翻滚阻挡了海浪,巩固了北极冰架

IF 2.8 3区 地球科学 Q2 GEOGRAPHY, PHYSICAL Journal of Glaciology Pub Date : 2023-08-14 DOI:10.1017/jog.2023.58
Peter Nekrasov, D. Macayeal
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引用次数: 0

摘要

沃德·亨特冰架和米尔恩冰架是曾经环绕加拿大埃尔斯米尔岛海岸的一个大得多的冰架的遗迹。这些冰架具有独特的表面形态,由与海岸线平行的波浪状卷组成。撇开这些卷最初是如何发展的问题,我们考虑这种卷的形态对冰架稳定性的影响。特别是,我们研究了冰架厚度和水深的周期性变化是否会阻止冰架中兰姆波的激发。利用数值模型的层次结构,我们发现在冰架的弯曲和伸展模式中存在带隙,这意味着存在缺乏波动的频率范围。我们表明,带卷的冰架能够反射这些频率范围内入射到其冰锋上的波,从而减轻不必要的应力和冰裂。我们推测,卷的形态为生存提供了一种“适应性”,这解释了为什么在北极最古老、最厚的多年海冰中可以观察到卷。
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Ocean wave blocking by periodic surface rolls fortifies Arctic ice shelves
The Ward Hunt and Milne ice shelves are the present-day remnants of a much larger ice shelf that once fringed the coast of Ellesmere Island, Canada. These ice shelves possess a unique surface morphology consisting of wave-like rolls that run parallel to the shoreline. Setting aside the question of how these rolls originally developed, we consider the impact of this roll morphology on the stability of the ice shelf. In particular, we examine whether periodic variations in ice-shelf thickness and water depth implied by the rolls prevent the excitation of Lamb waves in the ice shelf. Using a hierarchy of numerical models, we find that there are band gaps in the flexural and extensional modes of the ice shelf, implying the existence of frequency ranges that lack wave motion. We show that an ice shelf with rolls is able to reflect waves in these frequency ranges that are incident upon its ice front, thereby mitigating undue stress and calving. We speculate that the roll morphology provides a “fitness” for survival that explains why rolls are observed in the oldest and thickest multiyear sea ice of the Arctic.
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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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