海洋中尺度和次级涡流模型的例子

IF 0.7 Q4 OCEANOGRAPHY
E. V. Stanev, Marcel Ricker, S. Grayek, B. Jacob, V. Haid, Joanna Staneva
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引用次数: 0

摘要

目的。研究了地球物理流体在水平和垂直平面上的旋转运动。它的主要目的是追踪海洋高分辨率数值模式的发展,以及由于更正确地考虑了漩涡解析数值模式中的潮汐和海峡模式中的亚中尺度动力学而展示新的物理过程。方法与结果。采用4种分辨率为7 ~ 1.5 km的NEMO模型对欧洲西北陆架的海洋涡旋及其与潮汐的相互作用进行了数值模拟研究。采用超精细(小于100 m)非结构网格模式SCHISM进行数值模拟,研究了博斯普鲁斯海峡的垂直运动特征。正压潮汐强迫导致频谱曲线斜率大幅变平。四种模式的光谱特征之间最重要的区别在于运动旋转分量。在1.5 km分辨率的模式中,~70 km尺度涡度功率谱密度的量级比其他三个模式高一个数量级。虽然大部分的潮平与内潮有关,但在一定的水平分辨率之外,涡旋动力学受到正压潮的影响。比斯开湾的大陆架和法罗群岛周围的浅滩是对正压潮加入模式强迫最敏感的区域。由于网格的超精细分辨率,博斯普鲁斯地区出现了新的物理运动元素。横向环流以多个尺度~ 1 km的环流单体系统为主。在某些区域,横向流动的量级超过0.5 m/s,与轴向流动的量级相当。这揭示了海峡环流的螺旋要素对博斯普鲁斯海峡水团翻转的重要性。结论。没有适当的分辨率,潮汐海洋动力学模式模拟海洋环流,但不能正确描述涡旋尺度上的能量级联,包括潮汐和中尺度涡旋之间的相互作用。模式中缺少这种亚中尺度动力学会在很大程度上影响其模拟两层盆地间交换的能力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Примеры мезомасштабного и субмезомасштабного численного вихреразрешающего моделирования океана
Purpose. The study addresses rotational motion of geophysical fluids in the horizontal and vertical planes. It is aimed mainly at tracing the development of high-resolution numerical modeling of the ocean, as well as at demonstrating new physical processes due to more correct consideration both of the tides in the eddy-resolving numerical models and sub-mesoscale dynamics in the models of the sea straits. Methods and Results. The ocean eddies and their interaction with tides are studied using numerical simulations by four NEMO models for the European North-West shelf with the resolutions ranging from 7 to 1.5 km. The vertical characteristics of motion in the Bosporus Strait were studied using numerical simulations with SCHISM , the unstructured grid model with the ultra-fine model resolution (less than 100 m). The barotropic tidal forcing resulted in substantial flattening of the slopes of the spectral curves. The most important difference between the spectral featurws of four models occurs in the motion rotational component. In the model with the 1.5 km resolution, the magnitude of the vorticity power spectral density at the scales ~70 km is by an order of magnitude higher than in the other three models. Although most of the tidal flattening is associated with the internal tides, beyond a certain horizontal resolution, the eddy dynamics become affected by the barotropic tides. The shelf of the Biscay Bay and the shallows around the Faroe Islands are the most sensitive areas to adding of the barotropic tides to the model forcing. Due to the grid ultra-fine resolution, new elements of physical motion emerged in the Bosporus region. The lateral circulation is dominated by the systems of multiple circulation cells with the scales ~ 1 km. In some areas, the lateral flow magnitude exceeds 0.5 m/s, which is comparable with the magnitude of the axial flow. This reveals importance of the helical elements of the strait circulation for overturning of water masses in the Bosporus. Conclusions. Without proper resolution, the models of tidal oceanic dynamics simulate the ocean general circulation, but do not describe correctly the energy cascades at the eddy scales including interaction between the tides and the mesoscale eddies. Absence of this sub-mesoscale dynamics in the models can largely affect their capability to simulate the two-layer inter-basin exchange.
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来源期刊
Physical Oceanography
Physical Oceanography OCEANOGRAPHY-
CiteScore
1.80
自引率
25.00%
发文量
8
审稿时长
24 weeks
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