A comparative modeling study of the Brunt Ice Shelf/ Stancomb-Wills Ice Tongue system, East Antarctica
A comparative modeling study of the Brunt Ice Shelf/ Stancomb-Wills Ice Tongue system, East Antarctica
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东南极洲布伦特冰架/斯坦科姆-威尔斯冰舌系统的比较模型研究
DOI：
10.3189/002214309788608949
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发表时间：
2009
影响因子：
3.4
通讯作者：
M. Lange
中科院分区：
文献类型：
--
作者：
A. Humbert;T. Kleiner;Chris;C. Oelke;R. Greve;M. Lange
摘要两个诊断的，动力学/热力学的冰架模型应用于布伦特冰架/斯坦科姆-威尔斯冰舌系统，位于凯尔德海岸，科茨土地，南极洲。布伦特冰架/斯坦科姆-威尔斯冰舌系统的特点是一个薄的，无界的冰架，具有非典型和高度异质结构。与其他冰架不同的是，在快速移动的斯坦科姆-威尔斯冰流和缓慢移动的布伦特冰架之间存在着一个由冰山组成的复合体，这些冰山在接地线处崩解，然后被锁定在快速（海洋）冰中。我们用两种不同的模型模拟了由冰厚分布和接地线处的入流引起的冰架当前的流态，并将模型结果与特征跟踪和干涉合成孔径雷达流速进行了比较。然后，我们将两个观察到的功能，一个裂缝和剪切边缘，到模型中有两种不同的方法，并证明在这些区域的剪切强度和粘度数值的变化对模拟速度场的影响。一个主要的结果是，这两种实现的裂缝导致类似的效果，对整个速度场，而有差异的裂缝附近。
Abstract Two diagnostic, dynamic/thermodynamic ice-shelf models are applied to the Brunt Ice Shelf/Stancomb-Wills Ice Tongue system, located off Caird Coast, Coats Land, Antarctica. The Brunt Ice Shelf/Stancomb-Wills Ice Tongue system is characterized as a thin, unbounded ice shelf with an atypical and highly heterogeneous structure. In contrast to other ice shelves, a composite mass of icebergs that calved at the grounding line and were then locked within fast (sea) ice exists between the fast-moving Stancomb-Wills Ice Stream and the slow-moving Brunt Ice Shelf. We simulate the present flow regime of the ice shelf that results from the ice-thickness distribution and the inflow at the grounding line with two different models, and compare the model results with feature tracking and InSAR flow velocities. We then incorporate two observed features, a rift and a shear margin, into the models with two different approaches, and demonstrate the effects of variations in numerical values for the shear strength and viscosity in these zones on the simulated velocity field. A major result is that both kinds of implementation of the rifts lead to similar effects on the entire velocity field, while there are discrepancies in the vicinity of the rifts.