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首页> 外文期刊>Ocean Science Discussions >Response to Filchner–Ronne Ice Shelf cavity warming in a coupled ocean–ice sheet model – Part 1: The ocean perspective
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Response to Filchner–Ronne Ice Shelf cavity warming in a coupled ocean–ice sheet model – Part 1: The ocean perspective

机译：海冰板耦合模型中对Filchner-Ronne冰架腔升温的响应–第1部分：海洋视角

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The Regional Antarctic ice and Global Ocean (RAnGO) model has been developed to study the interaction between the world ocean and the Antarctic ice sheet. The coupled model is based on a global implementation of the Finite Element Sea-ice Ocean Model (FESOM) with a mesh refinement in the Southern Ocean, particularly in its marginal seas and in the sub-ice-shelf cavities. The cryosphere is represented by a regional setup of the ice flow model RIMBAY comprising the Filchner–Ronne Ice Shelf and the grounded ice in its catchment area up to the ice divides. At the base of the RIMBAY ice shelf, melt rates from FESOM's ice-shelf component are supplied. RIMBAY returns ice thickness and the position of the grounding line. The ocean model uses a pre-computed mesh to allow for an easy adjustment of the model domain to a varying cavity geometry. RAnGO simulations with a 20th-century climate forcing yield realistic basal melt rates and a quasi-stable grounding line position close to the presently observed state. In a centennial-scale warm-water-inflow scenario, the model suggests a substantial thinning of the ice shelf and a local retreat of the grounding line. The potentially negative feedback from ice-shelf thinning through a rising in situ freezing temperature is more than outweighed by the increasing water column thickness in the deepest parts of the cavity. Compared to a control simulation with fixed ice-shelf geometry, the coupled model thus yields a slightly stronger increase in ice-shelf basal melt rates.
机译：已经开发了区域南极冰与全球海洋（RAnGO）模型来研究世界海洋与南极冰盖之间的相互作用。耦合模型基于有限元海冰海洋模型（FESOM）的全球实现，并在南大洋，特别是在其边缘海域和子冰架腔中进行了网格细化。冰冻圈以冰流模型RIMBAY的区域设置为代表，该模型包括Filchner-Ronne冰架和集水区直至碎冰的地面冰。在RIMBAY冰架的底部，提供了FESOM冰架部件的融化速率。 RIMBAY返回冰的厚度和接地线的位置。海洋模型使用预先计算的网格，可以轻松地将模型域调整为变化的空腔几何形状。在20世纪的气候强迫下进行的RAnGO模拟产生了逼真的基础融化速率，并且准稳定的接地线位置接近目前的观测状态。在百年尺度的热水流入情况下，该模型表明冰架明显变薄，接地线局部退缩。通过增加原位冻结温度，冰架变薄所带来的潜在负反馈，要比空腔最深处水柱厚度的增加所抵消。与具有固定的冰架几何形状的控制仿真相比，耦合模型因此产生的冰架基础融化速率稍微强一些。

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