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首页> 外文期刊>Ocean Dynamics >Short-term, linear, and non-linear local effects of the tides on the surface dynamics in a new, high-resolution model of the Mediterranean Sea circulation
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Short-term, linear, and non-linear local effects of the tides on the surface dynamics in a new, high-resolution model of the Mediterranean Sea circulation

机译：潮汐对地中海循环的新型高分辨率模型中潮汐对表面动力学的短期，线性和非线性局部效应

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摘要

The tides in the Mediterranean Sea are generally weaker than in other regions of the world ocean, but are locally intensified in passages with complex bathymetry, such as the Gibraltar Strait and the Sicily Channel. To date, a detailed understanding of their effects on the circulation, on the short time scales relevant to forecasting, is still missing, due to the lack of specific observations, and of basin-scale, numerical models explicitly accounting for the tidal forcing. The present investigation attempts to bridge this gap, using a newly developed forecasting model of the circulation of the Mediterranean Sea-Black Sea system that includes the effects of the main diurnal and semidiurnal astronomical tides. After validating the model barotropic tidal dynamics through comparison with the results of a tidal inversion software and historical data, a fully baroclinic run is analyzed, with focus on the Mediterranean Sea dynamics. The run covers the period 19 March-30 April 2018 and is initialized and forced with realistic fields produced by state-of-the-art operational models. After verifying that the modelled circulation and hydrology agree with available remote and in situ observations, attention is focused on short-time effects of the tidal forcing on the local circulation. Tides are found to significantly modulate transports not only across the Strait of Gibraltar and the Sicily Channel, as expected, but also across the Corsica Channel and the Otranto Strait. Tidal effects also modify relevant features of the circulation inside the basin, inducing local modulations of some of the main currents and exciting topographic waves that eventually get trapped over shallow bathymetric features, producing diurnal rotations of the flow patterns. Examples of the latter dynamics are found over the Adventure Bank and the Malta Plateau, in the Sicily Channel, and in the eastern portions of the Corsica Channel and the Otranto Strait. Furthermore, in several locations (Sicily Channel, Corsica Channel, Messina Strait, North Adriatic Sea), spectral analysis of the mean kinetic energy reveals the presence of spectral peaks corresponding to periods of about 8 and 6 h, which can only be interpreted as harmonics (overrides and compound tides) of the diurnal and semidiurnal tidal components, generated through non-linear interactions. This shows that, contrary to a widespread assumption, tidal effects in the Mediterranean cannot be linearly superimposed on the basin circulation.
机译：地中海的潮汐通常比世界其他海洋的其他地区较弱，但在具有复杂的沐浴族的段落中，如直布罗陀海峡和西西里岛的渠道。迄今为止，由于缺乏特定观察和盆地，数值模型，对与预测相关的短时间尺度对其对流通影响的详细了解其对流通的影响仍然缺失。目前的调查试图弥合这种差距，利用新建的地中海海黑海系统的流通的预测模型，其中包括主要昼夜和半峰天文潮流的影响。通过与潮气反转软件和历史数据的结果进行验证，通过比较验证了波波罗波波波波波波托尔动力学，分析了一个完全曲金的运行，重点是地中海动态。该赛涵盖2018年3月30日至3月30日，并初始化并强制使用最先进的操作模型生产的现实领域。在验证建模的循环和水文与可用偏远和原地观察中同意后，关注潮汐迫使当地循环的短时间效应。发现潮汐显着调节，不仅可以根据预期的跨越直布罗陀和西西里犬的海峡两岸的运输，而且在科西嘉频道和耳藤海峡两岸。潮汐效应还修改了盆内内部循环的相关特征，诱导了一些主要电流的局部调制以及最终被捕获在浅碱基特征上的兴奋地形波，产生流动模式的昼夜旋转。后者动态的例子在西西里岛的探险银行和马耳他高原上发现，以及在科西嘉频道的东部和耳垂海峡的东部。此外，在几个地点（西西里岛沟道，Corsica频道，墨西州海峡，北亚得里亚海）中，平均动能的光谱分析显示了对应于约8和6小时的光谱峰的存在，这只能被解释为谐波（覆盖和复合潮汐）通过非线性相互作用产生的昼夜和半潮潮汐组分。这表明，与广泛的假设相反，地中海中的潮汐效应不能在盆地循环上线性叠加。

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