Ocean tides and resonance
Ocean tides and resonance
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DOI：
10.1007/s10236-010-0331-1
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发表时间：
2010-10-01
期刊：
影响因子：
2.3
通讯作者：
Green, Johan A. Mattias
中科院分区：
文献类型：
--
作者：
Green, Johan A. Mattias
潮流和表面振幅计算全球主导的昼夜和半日组成部分，使用一个既定的潮汐模型下的一系列改变水深。其目的是评估，如果众所周知的放大全球潮汐在末次冰期最大（LGM）有关的潮汐波的传播特性的变化或改变阻尼由于删除陆架海。文中还讨论了潮汐和潮汐耗散对未来海平面上升的响应。在目前和LGM海洋的潮汐进行了模拟第一，其次是运行在今天的测深，但通过引入垂直墙或海平面被允许上升的陆架海。以前报道的结果，潮汐振幅和耗散率再现的控制运行。没有陆架海的运行显示显着增强的潮汐振幅在北大西洋，而海平面上升5米以上，目前的水平显示了显着的转变，在当地和区域尺度上的无潮点，但对开放的海洋潮汐的影响有限。非常大的海平面上升的模拟表明，全球潮汐耗散显着减少，而在当今浅水中没有摩擦的实验显示的结果类似于那些没有陆架海。结果都指向改变阻尼特性，由于删除陆架海作为LGM放大背后的机制，他们意味着实施未来的海平面变化的重要性，正确的潮汐模拟。
Tidal currents and surface amplitudes are calculated globally for the dominating diurnal and semidiurnal constituents using an established tidal model under a range of altered bathymetry. The purpose is to evaluate if the well-known amplification of the global tides during the Last Glacial Maximum (LGM) is related to changed propagation properties for the tidal wave or to changed damping due to removal of shelf seas. The response of the tides and tidal dissipation to future sea-level rise is also discussed. The tides in the present and LGM oceans were simulated first, followed by runs where the present day bathymetry was used but the shelf seas removed by the introduction of vertical walls or where sea level is allowed to rise. Previously reported results regarding tidal amplitudes and dissipation rates are reproduced in the control runs. The runs without shelf seas show significantly enhanced tidal amplitudes in the North Atlantic, whereas sea-level rise of 5 m above present levels show a significant shift in the amphidromic points on a local and regional scale but had a limited effect on the open ocean tides. Simulations with very large sea-level rise show a significantly decreased global tidal dissipation, whereas experiments without friction in present-day shallow water display results similar to those with no shelf seas. The results all point towards changing damping properties due to the removal of shelf seas as being the mechanism behind the LGM amplification, and they imply the importance of implementing future sea-level changes properly in tidal simulations.