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Free keywords:
Tides; nonlinear shallow-water tides; ephemerides
DDC:
550 - Earth sciences
Abstract:
Traditionally, global ocean tide models are forced by individual partial tides resulting from a decomposition of the complete lunisolar tidal potential in Fourier components. Implicitly, this approach neglects nonlinear interactions between partial tides. This can be partly compensated by a superposition of a selection of partial tides. In order to ensure the full dynamics, the Tidal Model forced by Ephemerides (TiME) incorporates the tidal potential of second degree calculated online from analytical ephemerides and utilizes the classical shallow-water equations with a horizontal resolution of 5 min globally. Interactions between partial tides generate shallow-water tides which are shown to form in extended shelf areas where they develop the highest amplitudes. However, as they propagate into the open ocean, they should be regarded as a global phenomenon. Simulations with TiME confirm that M 4 is particularly pronounced in the Atlantic and suggest further areas of strong energy fluxes in the southern Pacific. MN 4 is strongest in the Atlantic and MS 4, 2SM 2, and MK 3 mainly spread out into the Indian Ocean.
