Evolving Instability of the Scar Inlet Ice Shelf based on Sequential Landsat Images Spanning 2005-2018
Evolving Instability of the Scar Inlet Ice Shelf based on Sequential Landsat Images Spanning 2005-2018
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DOI：
10.3390/rs12010036
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发表时间：
2019-12
期刊：
影响因子：
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通讯作者：
Gan Qiao;Yanjun Li;Song Guo;W. Ye
中科院分区：
文献类型：
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作者：
Gan Qiao;Yanjun Li;Song Guo;W. Ye
2002年拉森B冰架（LBIS）大规模崩解后，其残余冰川和支流冰川的冰流速度开始增加。在这项研究中，我们使用 2005 年至 2018 年的连续陆地卫星图像来绘制斯卡湾冰架 (SIIS) 的冰流速度和表面特征的详细地图。我们的结果表明，SIIS 及其支流冰川（弗拉斯克冰川和莱帕德冰川）的冰流速度自 2005 年以来大幅增加。裂谷和裂缝等表面特征的范围和规模也大幅增加，在莱帕德冰川和杰森半岛之间的区域尤其明显。一些指标——包括冰流加速、主要表面裂谷的快速增长、表面裂缝的严重增强以及冰锋的动态位置——都表明了SIIS不断演变的不稳定性。这些相同的指标描述了导致 LBIS 2002 年崩溃的条件。然而迄今为止，SIIS 仍然完好无损。支撑冰架前缘的固冰的形成，加上夏季平均气温适中，可能会防止或延迟其崩塌。
Following the large-scale disintegration of the Larsen B Ice Shelf (LBIS) in 2002, ice flow velocities for its remnants and tributary glaciers began to increase. In this study, we used sequential Landsat images spanning 2005–2018 to produce detailed maps of the ice flow velocities and surface features for the Scar Inlet Ice Shelf (SIIS). Our results indicate that the ice flow velocities for the SIIS and its tributary glaciers (Flask and Leppard Glaciers) have substantially increased since 2005. Surface features, such as rifts and crevasses, have also substantially increased in both scope and scale and are particularly evident in the region between the Leppard Glacier and the Jason Peninsula. Several indicators—including the acceleration of ice flows, the rapid growth of major surface rifts, the heavily enhanced surface crevasses, and the dynamic position of the ice front—point to the evolving instability of the SIIS. These same indicators describe the conditions for the LBIS leading up to its 2002 collapse. To date, however, the SIIS remains intact. The formation of fast ice supporting the ice shelf front, combined with moderate mean summer temperatures, may be preventing or delaying its collapse.