Adaptive mesh, finite volume modeling of marine ice sheets
Adaptive mesh, finite volume modeling of marine ice sheets
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DOI：
10.1016/j.jcp.2012.08.037
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发表时间：
2013-01-01
影响因子：
4.1
通讯作者：
Lipscomb, William H.
中科院分区：
文献类型：
--
作者：
Cornford, Stephen L.;Martin, Daniel F.;Lipscomb, William H.
大陆尺度的海洋冰盖，如今天的西南极冰盖的强烈影响，高度本地化的功能，提出了一个挑战的数值模式。也许这类现象中最著名的是接地线的迁移，即与基岩接触的冰和浮动冰架之间的分界线，这需要以低于公里的分辨率进行处理。我们实现了一个块结构的有限体积法与自适应网格细化（AMR）的三维冰盖，这使我们能够离散一个狭窄的区域周围的接地线在高分辨率和低分辨率的冰盖的其余部分。我们展示了AMR模拟一致的均匀网格模拟，但计算成本低得多，适当和有效地发展网格的接地线移动了很大的距离。作为一个应用实例，我们模拟了南极洲西部松岛冰川由于冰架下的融化而引起的快速消融。(C)2012 Elsevier Inc. All rights reserved.
Continental scale marine ice sheets such as the present day West Antarctic Ice Sheet are strongly affected by highly localized features, presenting a challenge to numerical models. Perhaps the best known phenomenon of this kind is the migration of the grounding line the division between ice in contact with bedrock and floating ice shelves - which needs to be treated at sub-kilometer resolution. We implement a block-structured finite volume method with adaptive mesh refinement (AMR) for three dimensional ice sheets, which allows us to discretize a narrow region around the grounding line at high resolution and the remainder of the ice sheet at low resolution. We demonstrate AMR simulations that are in agreement with uniform mesh simulations, but are computationally far cheaper, appropriately and efficiently evolving the mesh as the grounding line moves over significant distances. As an example application, we model rapid deglaciation of Pine Island Glacier in West Antarctica caused by melting beneath its ice shelf. (C) 2012 Elsevier Inc. All rights reserved.