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首页> 外文期刊>Surveys in Geophysics: An International Review Journal of Geophysics and Planetary Sciences >Representing Grounding Line Dynamics in Numerical Ice Sheet Models: Recent Advances and Outlook
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Representing Grounding Line Dynamics in Numerical Ice Sheet Models: Recent Advances and Outlook

机译：在数值冰盖模型中表示接地线动力学：最新进展和展望

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摘要

Recent satellite observations of the Antarctic and Greenland ice sheets show accelerated ice flow and associated ice sheet thinning along coastal outlet glaciers in contact with the ocean. Both processes are the result of grounding line retreat due to melting at the grounding line (the grounding line is the contact of the ice sheet with the ocean, where it starts to float and forms an ice shelf or ice tongue). Such rapid ice loss is not yet included in large-scale ice sheet models used for IPCC projections, as most of the complex processes are poorly understood. Here we report on the state-of-the art of grounding line migration in marine ice sheets and address different ways in which grounding line migration can be attributed and represented in ice sheet models. Using one-dimensional ice flow models of the ice sheet/ice shelf system we carried out a number of sensitivity experiments with different spatial resolutions and stress approximations. These are verified with semi-analytical steady state solutions. Results show that, in large-scale finite-difference models, grounding line migration is dependent on the numerical treatment (e. g. staggeredon-staggered grid) and the level of physics involved (e. g. shallow-ice/shallow-shelf approximation).
机译：最近对南极和格陵兰冰盖的卫星观测显示，沿沿海出口冰川与海洋接触的冰流加快，并且冰盖变薄。这两个过程都是由于接地线融化而导致接地线后退的结果（接地线是冰盖与海洋的接触，在那里冰开始漂浮并形成冰架或冰舌）。由于对大多数复杂过程的了解不多，这种快速的冰损失还没有包括在用于IPCC投影​​的大型冰盖模型中。在这里，我们报告了海洋冰原中地线迁移的最新技术，并探讨了在冰原模型中归因于地线迁移的不同方法。使用冰盖/冰架系统的一维冰流模型，我们进行了许多具有不同空间分辨率和应力近似值的敏感性实验。这些已通过半解析稳态解决方案进行了验证。结果表明，在大规模有限差分模型中，接地线的偏移取决于数值处理（例如，交错/非交错网格）和所涉及的物理水平（例如，浅冰/浅层近似）。

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