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首页> 外文期刊>Ocean Dynamics >The impact of freshwater discharges on the ocean circulation in the Skagerrakorthern North Sea area Part Ⅰ: model validation
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The impact of freshwater discharges on the ocean circulation in the Skagerrakorthern North Sea area Part Ⅰ: model validation

机译：Skagerrak /北海北部地区淡水排放对海洋环流的影响第一部分：模型验证

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摘要

We assess the performance of an eddy-recognizing numerical ocean model in simulating the pattern and variability of the hydrography in the Skagerrakorthern North Sea area. The model we use is a version of the widely used Princeton ocean model employing a terrain-following vertical coordinate. Results from a series of five multi-year simulations of the mesoscale response are described. The simulations differ in their representation of the lateral freshwater supply to the model ocean of which the first is a reference simulation. The next four are variations in which the river discharges and/or the Baltic outflow are given more realistic representations. For validation, we have used in situ hydrographic data. A novelty is that we use the concepts of freshwater height and potential energy anomaly as objective validation tools. We find that, in general, the model faithfully reproduces many of the observed hydrographic features including their mean patterns and their variance. Not surprisingly, we find that the Baltic outflow is by far the most significant freshwater source in terms of its influence on the hydrography in the area, a result corroborating earlier findings. The best validation is obtained when all freshwater supply is made as realistic as possible, in particular the Baltic outflow. We also find that the large scale cyclonic circulation and the location of fronts arernrobust characteristics of the Skagerrakorthern North Sea circulation given the impact changes in the freshwater input has on the hydrography. Finally, we find that a further exploration of the impact of the lateral open boundary forcing, e.g., the input of Atlantic water, is needed.
机译：我们在模拟Skagerrak /北海北部地区的水文模式和变异性时，评估了可识别涡流的数值海洋模型的性能。我们使用的模型是使用地形跟随垂直坐标的普林斯顿海洋模型的广泛使用的版本。描述了一系列中尺度响应的五个五年模拟结果。这些模拟在表示向模型海洋的侧向淡水供应方面有所不同，首先是参考模拟。接下来的四个是对河流流量和/或波罗的海流出量的更实际表示。为了验证，我们使用了原位水文数据。一种新颖之处在于，我们将淡水高度和势能异常的概念用作客观验证工具。我们发现，一般而言，该模型忠实地再现了许多观测到的水文特征，包括其均值模式和方差。毫不奇怪，就其对该地区水文学的影响而言，我们发现波罗的海流出物是迄今为止最重要的淡水源，这一结果证实了较早的发现。当所有淡水供应，尤其是波罗的海的出水都尽可能地切合实际时，才能获得最佳的验证。我们还发现，考虑到淡水输入对水文学的影响，Skagerrak /北海北部环流的大规模旋风环流和锋面的位置是鲁棒的。最后，我们发现需要进一步研究横向开放边界强迫的影响，例如大西洋水的输入。

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