Evaluation of an eddy-permitting finite-element ocean model in the North Atlantic
Evaluation of an eddy-permitting finite-element ocean model in the North Atlantic
复制标题
北大西洋允许涡流有限元海洋模型的评估
DOI：
10.1016/j.ocemod.2004.07.006
复制
发表时间：
2004
期刊：
影响因子：
3.2
通讯作者：
J. Schröter
中科院分区：
文献类型：
--
作者：
S. Danilov;G. Kivman;J. Schröter
基于计算域四面体划分的新版本 3D 有限元原始方程海洋模型 (FEOM) 用于以允许涡流分辨率 (1/15°–2°) 模拟北大西洋环流。它依赖于陡峭地形区域中的水平细化网格，并允许在 z 坐标垂直离散化内表示倾斜底部，类似于所谓的剃须单元方法。这是该方法首次用于模拟大规模海洋环流。将北大西洋的 FEOM 性能与 DYNAMO 项目类似分辨率的有限差分模型的性能进行了比较。 FEOM 的经向翻转环流和热传输与 DYNAMO 项目模型的结果非常吻合，而平均海面高度表明存在仅由 DYNAMO 的 ISOPYCNIC 模型再现的湾流再循环。湾流和西深边界流在27°N的年平均输送量分别为37Sv和17Sv，核心速度分别约为1m/s和12cm/s。由于网格细化的灵活性，FEOM 提供了一种工具来模拟当前气候模型未解决的小规模现象对大规模海洋环流的影响。
A new version of the 3D finite-element primitive-equation ocean model (FEOM) based on tetrahedron partitioning of the computational domain is applied to simulate the North Atlantic circulation at eddy-permitting resolution (1/15°–2°). It relies on a horizontally refined mesh in regions of steep topography and allows the sloping bottom to be represented within the z-coordinate vertical discretization, similar to the so-called shaved-cell approach. It is the first time this approach is used to model large-scale ocean circulation. The FEOM performance in the North Atlantic is compared with that of the finite-difference models of similar resolution of the DYNAMO project. The meridional overturning circulation and heat transport of FEOM agree well with those of the DYNAMO project models, while the mean sea surface height demonstrates the presence of the Gulf Stream recirculation reproduced only by the ISOPYCNIC model of DYNAMO. The annual mean transports of the Gulf Stream and Deep Western Boundary Current at 27°N are of 37Sv and 17Sv with core velocities of about 1m/s and 12cm/s respectively. Due to flexibility in mesh refinement the FEOM provides a tool for modelling the influence of small-scale phenomena unresolved by current climate models on large-scale ocean circulation.