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首页> 外文期刊>Ocean Dynamics >Long-term ocean simulations in FESOM: evaluation and application in studying the impact of Greenland Ice Sheet melting
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Long-term ocean simulations in FESOM: evaluation and application in studying the impact of Greenland Ice Sheet melting

机译：FESOM中的长期海洋模拟：评估和在研究格陵兰冰盖融化影响中的应用

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摘要

The Finite Element Sea-ice Ocean Model (FESOM) is formulated on unstructured meshes and offers geometrical flexibility which is difficult to achieve on traditional structured grids. In this work, the performance of FESOM in the North Atlantic and Arctic Ocean on large time scales is evaluated in a hindcast experiment. A water-hosing experiment is also conducted to study the model sensitivity to increased freshwater input from Greenland Ice Sheet (GrIS) melting in a 0.1-Sv discharge rate scenario. The variability of the Atlantic Meridional Overturning Circulation (AMOC) in the hindcast experiment can be explained by the variability of the thermohaline forcing over deep convection sites. The model also reproduces realistic freshwater content variability and sea ice extent in the Arctic Ocean. The anomalous freshwater in the water-hosing experiment leads to significant changes in the ocean circulation and local dynamical sea level (DSL). The most pronounced DSL rise is in the northwest North Atlantic as shown in previous studies, and also in the Arctic Ocean. The released GrIS freshwater mainly remains in the North Atlantic, Arctic Ocean and the west South Atlantic after 120 model years. The pattern of ocean freshening is similar to that of the GrIS water distribution, but changes in ocean circulation also contribute to the ocean salinity change. The changes in Arctic and sub-Arctic sea level modify exchanges between the Arctic Ocean and subpolar seas, and hence the role of the Arctic Ocean in the global climate. Not only the strength of the AMOC, but also the strength of its decadal variability is notably reduced by the anomalous freshwater input. A comparison of FESOM with results from previous studies shows that FESOM can simulate past ocean state and the impact of increased GrIS melting well.
机译：有限元海冰海洋模型（FESOM）是在非结构化网格上制定的，并提供了在传统结构化网格上难以实现的几何灵活性。在这项工作中，通过后验实验评估了FESOM在北大西洋和北冰洋大尺度上的表现。还进行了装水实验，以研究模型在0.1-Sv排放速率情况下对格陵兰冰原（GrIS）融化增加的淡水输入的敏感性。后预报实验中大西洋子午向翻转环流（AMOC）的变异性可以通过对深对流站点的热盐胁迫的变异性来解释。该模型还再现了北冰洋的现实淡水含量变化和海冰范围。取水实验中的淡水异常导致海洋环流和局部动态海平面（DSL）发生重大变化。如先前的研究所示，最明显的DSL上升是在北大西洋西北部以及北冰洋。经过120个模型年后，释放的GrIS淡水主要保留在北大西洋，北冰洋和西南大西洋。海洋清新的模式与GrIS的水分布相似，但是海洋环流的变化也有助于海洋盐度的变化。北极和亚北极海平面的变化改变了北冰洋与亚极海之间的交换，从而改变了北冰洋在全球气候中的作用。异常淡水输入不仅会大大降低AMOC的强度，而且还会降低其年代际变异性的强度。将FESOM与以前的研究结果进行比较表明，FESOM可以模拟过去的海洋状态以及增加的GrIS融化的影响。

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