Full Stokes modeling of marine ice sheets: influence of the grid size
Full Stokes modeling of marine ice sheets: influence of the grid size
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DOI：
10.3189/172756409789624283
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发表时间：
2009-10
影响因子：
2.9
通讯作者：
G. Durand;O. Gagliardini;T. Zwinger;E. L. Meur;R. Hindmarsh
中科院分区：
文献类型：
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作者：
G. Durand;O. Gagliardini;T. Zwinger;E. L. Meur;R. Hindmarsh
摘要：利用有限元程序Elmer，我们表明我们所提出的冰盖/冰架过渡的全斯托克斯模型能够对接地线迁移给出一致的预测。与其他海洋冰盖模型一样，我们的方法对所选的网格分辨率高度敏感。然而，在接地线附近网格尺寸降至<5千米时，预测开始变得可靠，因为：（1）无论网格尺寸（<5千米）如何，稳态接地线位置基本相同（标准偏差为6千米），以及（2）在接地线附近对网格进行细化（200米）时，只要流体流动性的扰动保持单调，稳态解就与所施加的流体流动性扰动无关。
Abstract Using the finite-element code Elmer, we show that the full Stokes modeling of the ice-sheet/ice-shelf transition we propose can give consistent predictions of grounding-line migration. Like other marine ice-sheet models our approach is highly sensitive to the chosen mesh resolution. However, with a grid size down to <5 km in the vicinity of the grounding line, predictions start to be robust because: (1) whatever the grid size (<5 km) the steady-state grounding-line position is sensibly the same (6 km standard deviation), and (2) with a grid-size refinement in the vicinity of the grounding line (200 m), the steady-state solution is independent of the applied perturbation in fluidity, provided this perturbation remains monotonic.