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A statistical fracture model for Antarctic ice shelves and glaciers

机译:南极冰架和冰川的统计断裂模型

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Antarctica and Greenland hold enough ice to raise sea level by more than 65?m if both ice sheets were to melt completely. Predicting future ice sheet mass balance depends on our ability to model these ice sheets, which is limited by our current understanding of several key physical processes, such as iceberg calving. Large-scale ice flow models either ignore this process or represent it crudely. To model fractured zones, an important component of many calving models, continuum damage mechanics as well as linear fracture mechanics are commonly used. However, these methods have a large number of uncertainties when applied across the entire Antarctic continent because the models were typically tuned to match processes seen on particular ice shelves. Here we present an alternative, statistics-based method to model the most probable zones of the location of fractures and demonstrate our approach on all main ice shelf regions in Antarctica, including the Antarctic Peninsula. We can predict the location of observed fractures with an average success rate of 84?% for grounded ice and 61?% for floating ice and a mean overestimation error rate of 26?% and 20?%, respectively. We found that Antarctic ice shelves can be classified into groups based on the factors that control fracture location.
机译:如果两个冰原都完全融化,南极洲和格陵兰岛将拥有足够的冰层,以使海平面上升超过65?m。预测未来冰盖的质量平衡取决于我们对这些冰盖建模的能力,这受我们目前对几个关键物理过程(如冰山崩裂)的了解所限制。大型冰流模型要么忽略此过程,要么粗略地表示它。为了模拟裂缝区域,裂缝是许多崩塌模型的重要组成部分,通常使用连续损伤力学以及线性断裂力学。但是,在整个南极大陆上应用这些方法时,存在很多不确定性,因为通常对模型进行调整以匹配特定冰架上看到的过程。在这里,我们提出了一种基于统计的替代方法,可以对裂缝位置最可能的区域进行建模,并展示我们对南极洲所有主要冰架地区(包括南极半岛)的研究方法。我们可以预测观察到的裂缝的位置,碎冰的平均成功率为84%,浮冰的平均成功率为61%,平均高估错误率分别为26%和20%。我们发现,基于控制裂缝位置的因素,南极冰架可以分为几类。

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