Improvements in one-dimensional grounding-line parameterizations in an ice-sheet model with lateral variations

Improvements in one-dimensional grounding-line parameterizations in an ice-sheet model with lateral variations
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具有横向变化的冰盖模型中一维接地线参数化的改进

DOI:
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发表时间:
2020
期刊:
影响因子:
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通讯作者:
R. DeConto
R. DeConto
中科院分区:
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作者:
D. Pollard;R. DeConto

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抽象的。通过允许接地线的大致方向,改进了二维冰盖模式中支撑和接地线上的冰通量的边界层参数化的使用。这一和对模型接地线参数化的另一次修改在两种情况下进行了评估:狭窄的峡湾状区域(MISMIP+),以及在未来基于RCP8.5的气候下对西南极冰川消退的模拟。新的修改被发现对Fjord的结果有重大影响,这些结果现在在MISMIP+相互比较的其他模型的范围内。相比之下,这些修改对西南极的后退几乎没有影响,可能是因为更广泛的主要南极盆地的动力学被该模型以前更简单的一维公式充分代表了。随着未来的接地线在西南极模拟中穿过非常深的基岩地形,支撑很弱,偏差应力措施超过冰屈服应力,这意味着这些接地线将发生结构破坏。我们建议,这些接地线数量应该在其他冰模型的类似预测中进行检查,以更好地评估未来结构故障的可能性。
Abstract. The use of a boundary-layer parameterization of buttressing and ice flux across grounding lines in a two-dimensional ice-sheet model is improved by allowing general orientations of the grounding line. This and another modification to the model's grounding-line parameterization are assessed in two settings: a narrow fjord-like domain (MISMIP+), and in future simulations of West Antarctic ice retreat under RCP8.5-based climates. The new modifications are found to have significant effects on the fjord results, which are now within the envelopes of other models in the MISMIP+ intercomparison. In contrast, the modifications have little effect on West Antarctic retreat, presumably because dynamics in the wider major Antarctic basins are adequately represented by the model's previous simpler one-dimensional formulation. As future grounding lines retreat across very deep bedrock topography in the West Antarctic simulations, buttressing is weak and deviatoric stress measures exceed the ice yield stress, implying that structural failure at these grounding lines would occur. We suggest that these grounding-line quantities should be examined in similar projections by other ice models, to better assess the potential for future structural failure.
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期刊: --
影响因子: --
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