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首页> 外文期刊>Annals of Glaciology >Resolution of ice streams and outlet glaciers in large-scale simulations of the Greenland ice sheet
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Resolution of ice streams and outlet glaciers in large-scale simulations of the Greenland ice sheet

机译：格陵兰冰原的大规模模拟中冰流和出口冰川的分辨率

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The dynamic/thermodynamic shallow-ice model SICOPOLIS is applied to the Greenland ice sheet. Paleoclimatic spin-ups from 125 ka BP until today, as well as future-climate experiments 500 years into the future, are carried out with three different grid spacings, namely 20, 10 and 5 km. The scenarios are a subset of those specified by the SeaRISE (Sea-level Response to Ice Sheet Evolution) community effort. The bed topography includes improved troughs for Jakobshavn Isbr?, Helheim, Kangerdlugssuaq and Petermann glaciers, processed by an algorithm that preserves shape, orientation and continuity of the troughs on the 5 km scale. Comparison of simulated and observed present-day surface velocities shows that these ice streams and outlet glaciers are resolved with different accuracies, ranging from poor (20 km grid) to reasonably good (5 km grid). In the future-climate experiments, the simulated absolute ice volumes depend significantly on the resolution, while the sensitivities (ice volumes relative to the constant-climate control run) vary only by a few centimeters of sea-level equivalent.
机译：动态/热力学浅冰模型SICOPOLIS被应用于格陵兰冰原。从125 ka BP到今天的古气候起伏，以及距今500年的未来气候实验都是以三种不同的网格间距（即20、10和5 km）进行的。这些方案是SeaRISE（对冰原演化的海平面响应）社区活动指定的方案的子集。床的地形包括Jakobshavn Isbr？，Helheim，Kangerdlugssuaq和Petermann冰川的改良槽，并通过一种算法进行处理，该算法在5 km的范围内保留了槽的形状，方向和连续性。模拟和观察到的当今地表速度的比较表明，这些冰流和出口冰川的分辨率不同，范围从较差（20 km网格）到相当不错（5 km网格）。在未来气候实验中，模拟的绝对冰量在很大程度上取决于分辨率，而灵敏度（相对于恒定气候控制运行的冰量）仅变化了几厘米的海平面当量。

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