Secular effects of oceanic tidal dissipation on the Moon's orbit and the Earth's rotation

Hansen, Kirk S.

doi:10.1029/rg020i003p00457

Cited by 98 publications

(60 citation statements)

References 75 publications

(34 reference statements)

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“…The Earth might have also still been suffering from such planetesimal collisions at that time because the Earth was much closer to the Moon 54 . The planetesimal collision might have destroyed developing biosphere on the Earth.…”

Section: Discussionmentioning

confidence: 99%

Discovery of seifertite in a shocked lunar meteorite

et al. 2013

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Many craters and thick regoliths of the moon imply that it has experienced heavy meteorite bombardments. Although the existence of a high-pressure polymorph is a stark evidence for a dynamic event, few high-pressure polymorphs are found in a lunar sample. a-PbO 2 -type silica (seifertite) is an ultrahigh-pressure polymorph of silica, and is found only in a heavily shocked Martian meteorite. Here we show evidence for seifertite in a shocked lunar meteorite, Northwest Africa 4734. Cristobalite transforms to seifertite by high-pressure and -temperature condition induced by a dynamic event. Considering radio-isotopic ages determined previously, the dynamic event formed seifertite on the moon, accompanying the complete resetting of radio-isotopic ages, is B2.7 Ga ago. Our finding allows us to infer that such intense planetary collisions occurred on the moon until at least B2.7 Ga ago.

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Section: Discussionmentioning

confidence: 99%

Discovery of seifertite in a shocked lunar meteorite

et al. 2013

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“…We emphasize that this rate of tidal dissipation is about as large as it could be while still being consistent with the stability of the Moon's orbit over the life of the solar system. Still lower Precambrian tidal torques have been suggested on theoretical grounds (Hansen, 1982;Webb, 1983).…”

Section: Torque On the Resonant Tidementioning

confidence: 99%

A constant daylength during the precambrian era?

Zahnle

Walker

1987

Precambrian Research

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Zahnle, K. and Walker, J.C.G., 1987. A constant daylength during the Precambrian Era? Precambrian Res., 37: 95-105.The semidiurnal atmospheric thermal tide would have been resonant with free oscillations of the atmosphere when the day was ~ 21 h long, c. 600 Ma ago. Very large atmospheric tides would have resulted, with associated surface pressure oscillations in excess of 10 mbar in the tropics. Near resonance the Sun's gravitational torque on the atmospheric tide -accelerating Earth's rotation -would have been comparable in magnitude to the decelerating lunar torque upon the oceanic tides. The balance of the opposing torques may have long maintained a resonant ~ 21 h day, perhaps for much of the Precambrian. Because the timescale of lunar orbital evolution is not directly affected, a constant daylength would result in fewer days/month. The hypothesis is shown not to conflict with the available (stromatolitic) evidence. Escape from the resonance could have followed a relatively abrupt global warming, such as that occurring at the end of the Precambrian. Alternatively, escape may simply have followed a major increase in the rate of oceanic tidal dissipation, brought about by the changing topography of the world's oceans. We integrate the history of the lunar orbit with and without a sustained resonance, finding that the impact of a sustained resonance on the other orbital parameters of the Earth-Moon system would not have been large.

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“…There is an increase in the orbits explained by tidal effect [10] [11] due to flexing of the interacting bodies. The periodically flexing of the orbiting bodies due to tidal effects converts some of the orbital energy to heat.…”

Section: Introductionmentioning

confidence: 99%

The Contribution of the Gravitational Propagation Delay to Orbital and Center of Mass Motions

Kornreich¹

2016

JMP

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Recent measurements have shown that gravitational waves and thus the gravitational interaction propagate with the speed of light. The propagation delay of the gravitational interaction in orbiting systems couples the orbital and center of mass motions. This causes the orbits to spiral out and the center of mass to accelerate. It is one of a number of small effects modifying the Kepler orbits. The calculations show that the analytical describable expansion of the semimajor axis started at a time that is less than the age of the systems. This could be caused by a collision of a system component in the past. The effect of this propagation delay on the motion of the Earth Moon and the Brown Dwarf 569Bab binary star system is analyzed. These systems were chosen because a considerable amount of measured astronomical data is available. The calculated results are in excellent agreement with the measured data. In galaxies, too, the energy transfer from the orbit of the star cloud to the center of mass motion causes the galaxies to accelerate. If galaxies are considered to be molecules of the universe, then the acceleration of the galaxies will cause the molecular gas to heat and expand. Alternatively, the loss in orbital internal energy of the galaxies should be included in the mass and energy in the calculation of the expanding Universe.

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Secular effects of oceanic tidal dissipation on the Moon's orbit and the Earth's rotation

Cited by 98 publications

References 75 publications

Discovery of seifertite in a shocked lunar meteorite

Discovery of seifertite in a shocked lunar meteorite

A constant daylength during the precambrian era?

The Contribution of the Gravitational Propagation Delay to Orbital and Center of Mass Motions

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