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Time-domain modeling of global ocean tides generated by the full lunisolar potential

机译：全日冕势产生的全球海洋潮汐的时域建模

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摘要

Traditionally, ocean tides have been modeled in frequency domain with a forcing from selected tidal constituents. It is a natural approach; however, it implicitly neglects non-linearities of ocean dynamics. An alternative approach is time-domain modeling with a forcing given by the full lunisolar potential, i.e., all tidal waves are a priori included. This approach has been applied in several ocean tide models; however, some challenging tasks still remain, for example, assimilation of satellite altimetry data. In this paper, we introduce the assimilative scheme applicable in a time-domain model, which is an alternative to existing techniques used in assimilative ocean tide models. We present results from DEBOT, a global barotropic ocean tide model, which has two modes: DEBOT-h, a purely hydrodynamical mode, and DEBOT-a, an assimilative mode. The accuracy of DEBOT in both modes is assessed through a series of tests against tide gauge data which demonstrate that DEBOT is comparable to state-of-the-art global ocean tide models for major tidal constituents. Furthermore, as signals of all tidal frequencies are included in DEBOT, we also discuss modeling of minor tidal constituents and non-linear compound tides. Our modeling approach can be useful for those applications where the frequency domain approach is not suitable.
机译：传统上，在选定的潮汐成分的强迫下，对海潮进行了频域建模。这是自然的方法；但是，它隐含地忽略了海洋动力学的非线性。另一种方法是时域建模，其强迫力由全日冕势给出，即所有潮汐都先验包括在内。这种方法已经在几种海潮模型中得到应用。但是，仍然存在一些具有挑战性的任务，例如，同化卫星测高仪数据。在本文中，我们介绍了适用于时域模型的同化方案，该方案是同化海洋潮汐模型中使用的现有技术的替代方案。我们介绍了全球正压海洋潮汐模型DEBOT的结果，该模型有两种模式：纯流体动力学模式DEBOT-h和同化模式DEBOT-a。通过针对潮汐仪数据进行的一系列测试，评估了两种模式下DEBOT的准确性，这些测试表明DEBOT与主要潮汐成分的最新全球海潮模型具有可比性。此外，由于所有潮汐频率的信号都包含在DEBOT中，因此我们还将讨论次潮汐分量和非线性复合潮汐的建模。我们的建模方法对于那些不适合使用频域方法的应用很有用。

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