The speedup of Pine Island Ice Shelf between 2017 and 2020: revaluating the importance of ice damage

IF 2.8 3区地球科学 Q2 GEOGRAPHY, PHYSICAL

Journal of Glaciology Pub Date : 2023-10-09 DOI:10.1017/jog.2023.76

Sainan Sun, G. Hilmar Gudmundsson

引用次数: 0

Abstract

Abstract From 2017 to 2020, three significant calving events took place on Pine Island Glacier, West Antarctica. Ice-shelf velocities changed over this period and the calving events have been suggested as possible drivers. However, satellite observations also show significant changes in the areal extent of fracture zones, especially in the marginal areas responsible for providing lateral support to the ice shelf. Here, we conduct a model study to identify and quantify drivers of recent ice-flow changes of the Pine Island Ice Shelf. In agreement with recent studies, we find that the calving events caused significant velocity changes over the ice shelf. However, calving alone cannot explain observed velocity changes. Changes in the structural rigidity, i.e. ice damage, further significantly impacted ice flow. We suggest that ice damage evolution of the ice-shelf margins may have influenced recent calving events, and these two processes are linked.

查看原文本刊更多论文

2017 - 2020年松岛冰架的加速:冰损重要性的重新评估

2017年至2020年，南极西部松岛冰川发生了三次重大的产犊事件。冰架的速度在这一时期发生了变化，而裂冰事件被认为是可能的驱动因素。然而，卫星观测也显示，断裂带的面积范围发生了显著变化，特别是在为冰架提供横向支撑的边缘地区。在这里，我们进行了一个模型研究，以确定和量化松岛冰架最近冰流变化的驱动因素。与最近的研究一致，我们发现冰裂事件引起了冰架上显著的速度变化。然而，单靠产犊不能解释观测到的速度变化。结构刚度的变化，即冰损伤，进一步显著影响冰流。我们认为冰架边缘的冰损演化可能影响了最近的冰裂事件，这两个过程是相互联系的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

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.