Abstract Numerical modeling shows great potential as a method for investigating and predicting the future development of ice shelves in a warming climate. The quality of ice shelf-ocean models is continuously improving but some limitations remain. For models using a terrain-following vertical coordinate, one such limitation is the enforcement of a minimum water-column thickness beneath ice shelves by adjustment of bottom topography. How this local distortion of bathymetry from reality affects modeled melt rates and cavity circulation is unknown so far. To quantify this effect, simulations with the Finite Element Sea ice–ice shelf–Ocean Model (FESOM) were executed on four different grids with minimum water-column thicknesses of 20 m, 50 m, 100 m and 200 m. While we use a global model grid, modifications of bathymetry are applied only to Filchner–Ronne Ice Shelf. We show that the choice of minimum water-column thickness does not affect the total basal melt rate of this cold-water ice shelf but does in fact impact the distribution of melt rates with significant differences between experiments in the magnitude of melting near the grounding lines.

中文翻译：

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具有地形跟随坐标的冰架-海洋模型中浅层接地区的表示

摘要 数值模拟作为一种在气候变暖下调查和预测冰架未来发展的方法显示出巨大的潜力。冰架-海洋模型的质量在不断提高，但仍然存在一些局限性。对于使用地形跟随垂直坐标的模型，其中一个限制是通过调整底部地形来强制执行冰架下方的最小水柱厚度。迄今为止，水深测量与实际情况的这种局部失真如何影响建模的熔化速率和腔体循环尚不清楚。为了量化这种影响，在最小水柱厚度为 20 m、50 m、100 m 和 200 m 的四个不同网格上使用有限元海冰-冰架-海洋模型 (FESOM) 进行了模拟。虽然我们使用全局模型网格，测深的修改仅适用于 Filchner-Ronne 冰架。我们表明，最小水柱厚度的选择不会影响该冷水冰架的总基础融化速率，但实际上会影响融化速率的分布，在接地线附近的融化幅度上，实验之间存在显着差异.