The speedup of Pine Island Ice Shelf between 2017 and 2020: revaluating the importance of ice damage
The speedup of Pine Island Ice Shelf between 2017 and 2020: revaluating the importance of ice damage
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DOI：
10.1017/jog.2023.76
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发表时间：
2023-10
影响因子：
3.4
通讯作者：
Sainan Sun;G. Gudmundsson
中科院分区：
文献类型：
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作者：
Sainan Sun;G. Gudmundsson
2017年至2020年，西南极洲松岛冰川发生了三次重大的冰解事件。在此期间，冰架的速度发生了变化，并已被建议作为可能的驱动程序的崩解事件。然而，卫星观测也显示，断裂带的面积范围发生了重大变化，特别是在负责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，以确定和量化最近的冰流变化的松岛冰架的驱动程序。与最近的研究相一致，我们发现，冰解事件引起了显着的速度变化的冰架。然而，单独的产犊不能解释观察到的速度变化。结构刚度的变化，即冰破坏，进一步显着影响冰流。我们认为，冰架边缘的冰损害演变可能影响了最近的产犊事件，这两个过程是相互关联的。
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.