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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Self-adapting open boundaries for a sigma coordinate model of the eastern North Atlantic
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Self-adapting open boundaries for a sigma coordinate model of the eastern North Atlantic

机译：北大西洋东部sigma坐标模型的自适应开放边界

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A regional non-eddy-resolving configuration of the SPEM5.1 primitive equation model is used to study the dynamics of the eastern North Atlantic. Along most of the domain perimeter, extensive open boundaries (OBs) evacuate outgoing perturbations, while the outer ocean is simulated by lateral relaxation of some of the model variables. Unlike in existing regional models, this lateral constraint only concerns the tracers and the baroclinic velocities, for which good climatological estimates exist. Along the OBs, the barotropic stream function is entirely determined by the model response to the inner dynamics, without relaxation to any questionable a priori estimate. The adjustment processes and their interaction with the open boundaries are described. The final solution is remarkably stable and quite realistic. The net transports crossing the boundaries are prescribed; we therefore investigated the impact of these parameters. We first show that the prescribed mass exchange between the basin and the rest of the Atlantic has almost no influence on the interior circulation since the western and southern lateral conditions naturally adjust to the interior dynamics. The net circulation constrained around Iceland, however, has large-scale consequences: Through the intensity of the overflow above the Iceland-Scotland Ridge (ISR), this parameter affects the stratification north and south of the Rockall Plateau, the subpolar dynamics, and finally the North Atlantic Current path up to the Charlie Gibbs Fracture Zone. This slowly propagating dynamical effect, already noticed in previous studies, is shown to be forced baroclinically near the ISR. [References: 36]
机译：SPEM5.1基本方程模型的区域非涡旋解析配置用于研究北大西洋东部的动力学。沿着大部分域边界，广泛的开放边界（OB）撤消了向外的扰动，而通过某些模型变量的侧向松弛来模拟外海。与现有的区域模型不同，此横向约束仅涉及示踪剂和斜压速度，为此存在良好的气候学估计。沿着OB，正压流函数完全由模型对内部动力学的响应确定，而不会松弛到任何可疑的先验估计。描述了调整过程及其与开放边界的相互作用。最终的解决方案非常稳定且非常现实。规定了跨越边界的净运输;因此，我们研究了这些参数的影响。我们首先表明，由于西部和南部的横向条件自然地适应了内部动力学，盆地与大西洋其他地区之间的规定质量交换几乎对内部循环没有影响。但是，受约束的冰岛周围的净环流具有大规模的后果：通过冰岛-苏格兰山脊（ISR）上方的溢流强度，该参数会影响Rockall高原北部和南部的分层，亚极动力学，并最终影响北大西洋电流路径一直延伸到查理·吉布斯断裂带。在先前的研究中已经注意到，这种缓慢传播的动力学效应被迫在ISR附近斜压施加。 [参考：36]

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