Detection of tidal dissipation in the solid Earth by satellite tracking and altimetry

Article Abstract:

The rate of dissipation of tidal energy in the solid-Earth during the semi-diurnal period is 83 plus or minus 45 gigawatts and the quality factor, Q, is 370 over a period of 12.4 hours. The lag between the body tide and lunar tidal potential is 0.16 plus or minus 0.09 degrees. This value agrees with the most probable lag determined by J. Zschau and the high Q values predicted theoretically. The dissipation rate has been determined by data on the ocean tide obtained by the Topex/Poseidon satellite altimeter and tracking of satellite orbit deviations.

Analysis, Usage, Measurement, Artificial satellites, Satellite tracking systems, Energy dissipation, Tides, Altimeter, Altimeters

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Palaeo-altimetry of the late Eocene to Miocene Lunpola basin, central Tibet

Article Abstract:

A study of the oxygen-isotope based estimates of the palaeo-altimetry of late Eocene and younger deposits of the Lunpola basin in the centre of the plateau indicate that the surface of Tibet has been at an elevation of more than 4 kilometres for at least the past 35 million years. It is concluded that crustal, but not mantle, thickening models, combined with plate-kinematic solutions of India-Asia convergence, are compatible with palaeo-elevation estimates across the Tibetan plateau.

China, Science & research, Tibet, Natural history, Basins (Geology), Landscape evolution, Tibetan Plateau

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Significant dissipation of tidal energy in the deep ocean inferred from satellite altimeter data

Article Abstract:

A new study uses satellite altimeter data to analyse tidal energy dissipation. It is shown that some 25-30% of total dissipation occurs in the deep ocean, rather than in shallow coastal areas as previously thought.

Models, Oceanographic research, Tidal power

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