Ocean tidal effects on Earth rotation |
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| Institution: | 1. Royal Observatory of Belgium, Brussels, Belgium;2. CNES, Toulouse, France;1. CNES, 18 Avenue Edouard Belin, 31400 Toulouse, France;2. CLS, 11, rue Hermès, Parc Technologique du Canal, 31520 Ramonville Saint-Agne, France;3. IGN, 73, Avenue de Paris, 94165 St-Mande, France;1. Institut National de l’Information Géographique et Forestière (IGN), 73 avenue de Paris, 94165 St-Mandé, France;2. Centre National d’Etudes Spatiales (CNES), 18 avenue Edouard Belin, 31400 Toulouse, France;1. Department of Physics of the Earth, Astronomy and Astrophysics I (Geophysics and Meteorology), Complutense University of Madrid (UCM), 28040 Madrid, Spain;2. Telecommunications/ICT Development Laboratory (T/ICT4D), Abdus Salam International Center for Theoretical Physics (ICTP), 34014 Trieste, Italy;3. Interdisciplinary Mathematics Institute (IMI) UCM, 28040 Madrid, Spain;4. Departament of Physics, Federal University Oye-Ekiti State, Nigeria;1. Department of Space and Astronautical Science, The Graduate University for Advanced Studies (SOKENDAI), 252-5210, Sagamihara, Japan;2. Space Research Group, Centre of Autonomous and Cyber-Physical Systems, Cranfield University, MK43 0AL, Bedford, United Kingdom;3. Reference Systems and Planetology, The Royal Observatory of Belgium (ROB), 1180, Brussels, Belgium;1. GFZ German Research Centre for Geosciences, Department 1: Geodesy, Telegrafenberg, 14473 Potsdam, Germany;2. Institut national de l’information géographique et forestiére, Marne-la-Vallée, France;3. Institut de Physique du Globe de Paris, UMR 7154, Gravimétrie et géodésie spatiale, Université Paris Diderot, Sorbonne Paris Cité, Paris, France |
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| Abstract: | Tidal forces due to the tide-raising potential deform the solid and fluid regions of the Earth, causing the Earth's inertia tensor to change, and hence causing the Earth's rate of rotation and length-of-day to change. Because both the tide-raising potential and the solid Earth's elastic response to the tidal forces caused by this potential are well-known, accurate models for the effects of the elastic solid body tides on the Earth's rotation are available. However, models for the effect of the ocean tides on the Earth's rotation are more problematic because of the need to model the dynamic response of the oceans to the tidal forces. Hydrodynamic ocean tide models that have recently become available are evaluated here for their ability to account for long-period ocean tidal signals in length-of-day observations. Of the models tested here, the older altimetric data-constrained model of Kantha et al. (1998) is shown to still do the best job of accounting for ocean tidal effects in length-of-day, particularly at the fortnightly tidal frequency. The model currently recommended by the IERS is shown to do the worst job. |
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