Results from the EISMINT model intercomparison: the effects of thermomechanical coupling
Results from the EISMINT model intercomparison: the effects of thermomechanical coupling
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DOI：
10.3189/172756500781832891
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发表时间：
2000
影响因子：
3.4
通讯作者：
A. Payne;P. Huybrechts;A. Abe‐Ouchi;R. Calov;J. Fastook;R. Greve;S. Marshall;I. Marsiat;C. Ritz
中科院分区：
文献类型：
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作者：
A. Payne;P. Huybrechts;A. Abe‐Ouchi;R. Calov;J. Fastook;R. Greve;S. Marshall;I. Marsiat;C. Ritz
本文讨论了欧洲冰盖模拟计划 (EISMINT) 第二阶段的结果。它报告了十个运行冰盖模型的相互比较，并使用一系列实验来检查热机械耦合对模型行为的影响。这项工作使用了一个示意性的圆形冰盖，研究稳态和对气候阶梯变化的响应。主要发现是，在某些情况下，实验设计中隐含的径向对称性可能会被破坏，形成明显的、规则间隔的冷冰辐条，这些辐条从冰盖内部向外延伸到周围的基底融化区域。这些特征也体现在模型预测的厚度和速度分布中。它们似乎是参与比较的所有模型的共同特征，并且可能源于冰温、流量和表面形状之间的相互作用。这些特征的确切性质因模型而异，它们的存在似乎受到冰盖整体热状态的控制。第二个结果是，这些模型在预测全球范围内对气候变化的响应方面存在相当大的一致性。
This paper discusses results from the second phase of the European Ice sheet Modelling Initiative (EISMINT). It reports the intercompartison of ten operational ice-sheet models and uses a series of experiments to examine the implications of thermomechanical coupling for model behaviour. A schematic, circular ice sheet is used in the work which investigates both steady states and the response to stepped changes in climate. The major finding is that radial symmetry implied in the experimental design can, under certain circumstances, break down with the formation of distinct, regularly spaced spokes of cold ice which extended from the interior of the ice sheet outward to the surrounding zone of basal melt. These features also manifest themselves in the thickness and velocity distributions predicted by the models. They appear to be a common feature to all of the models which took part in the intercomparison, and may stem from interactions between ice temperature, flow and surface form. The exact nature of these features varies between models, and their existence appears to be controlled by the overall thermal regimne of the ice sheet. A second result is that there is considerable agreement between the models in their predictions of global-scale response to imposed climate change.