Tides and the Earth-Moon System

Goldreich, Peter

doi:10.1038/scientificamerican0472-42

Cited by 17 publications

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“…Tides, their interaction with dynamics of the Earth--Moon system, theories of lunar origins, and the many contradictions are reviewed by Goldreich (1972).…”

Section: Days Per Year and Stromatolitesmentioning

confidence: 99%

Stromatolites and earth—sun—moon dynamics

Vanyo

Awramik

1985

Precambrian Research

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Vanyo, J.P. and Awramik, S.M., 1985. Stromatolites and Earth--Sun--Moon dynamics.Precambrian Res., 29 : 121--142.Inclination of stromatolite columns, caused by nonvertical direction of averaged incident solar radiation, provides a signal for deducing astronomical and geophysical data at time of stromatolite formation. A sample of Anabaria juvensis (Bitter Springs Formation, central Australia) shows a sinusoidal growth pattern which, interpreted as an annual signal (obliquity of the ecliptic) with daily production of laminae, indicates 435 days per year, a result consistent with other available estimates. A sample of Inzeria from the same formation also shows a sinusoidal pattern and a similar estimate for days per year. Both samples indicate growth rates of centimeters per year. Several laboratory measurement techniques offer systematic procedures for extracting data.

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“…Tides, their interaction with dynamics of the Earth--Moon system, theories of lunar origins, and the many contradictions are reviewed by Goldreich (1972).…”

Section: Days Per Year and Stromatolitesmentioning

confidence: 99%

Stromatolites and earth—sun—moon dynamics

Vanyo

Awramik

1985

Precambrian Research

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“…This drag slows down the rotation rate of Earth and transfers angular momentum from Earth to the Moon's orbit. Therefore the distance between the Earth-Moon system increases while the day length increases[Goldreich, 1972]. Early in Earth's history there would have been a smaller Earth-Moon distance and a corresponding shorter day length.…”

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confidence: 99%

A general circulation model study of the effects of faster rotation rate, enhanced CO₂ concentration, and reduced solar forcing: Implications for the faint young sun paradox

Jenkins¹

1993

J. Geophys. Res.

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Solar energy at the top of the atmosphere (solar constant), rotation rate, and carbon dioxide (CO2) may have varied significantly over Earth's history, especially during the earliest times. The sensitivity of a general circulation model to faster rotation, enhanced CO9. concentration, and reduced solar constant is presented. The control simulation of this study has a solar constant reduced by 10% the present amount, zero land fraction using a swamp ocean surface, CO9. concentrations of 330 ppmv, present-day rotation rate, and is integrated under mean diurnal and seasonal solar forcing. Four sensitivity test are performed under zero land fraction and reduced solar constant conditions: (1) increased rotation rate, (2) 8 times present CO9., (3) a combination of I and 2, and (4) 3 with a 15% reduction in the solar constant. Results indicate the following changes in the global mean sea surface temperatures (SSTs) compared to the control simulation:(1) q-6.6 K, (2) q-12 K, (3) q-18.5 K, and (4) q-6.6 K relative to the control's global mean temperature of 264.7 K. Sea ice is confined to higher latitudes in each experiment compared to the control, with ice-free areas equatorward of the subtropics. The warm SSTs are associated with a 20% reduction in clouds for the rotation rate experiments and higher CO9. concentrations in the other experiments. These results are in contrast to previous studies that have used energy balance and radiative convective models. Previous studies required a much larger atmospheric CO2 increase to prevent an ice-covered Earth. The results of the study, suggest that because of its possible feedback with clouds, the general circulation of the atmosphere should be taken into account in under standing the climate of early Earth. While higher CO9. concentrations are likely in view of the results, very large atmospheric CO9. concentrations may not be necessary to counterbalance the lower solar constant that existed early in Earth's history.

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“…It is derived from both slowing down the earth's rotation and increasing the .distance of the moon from the earth. Currently, the length of the earth day is increasing by approximately 20 ~sec per yr and the moon's orbit is expanding by about 3 cm per yr. 9 From these figures, the energy dissipated through the tide is calculated to be 2.6-3 TW, which is one third of today's world's power consumption.…”

Section: Tidal Energymentioning

confidence: 99%

Waves, currents, tides—problems and prospects

Voß¹

1979

Energy

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Tides and the Earth-Moon System

Cited by 17 publications

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Stromatolites and earth—sun—moon dynamics

Stromatolites and earth—sun—moon dynamics

A general circulation model study of the effects of faster rotation rate, enhanced CO₂ concentration, and reduced solar forcing: Implications for the faint young sun paradox

Waves, currents, tides—problems and prospects

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Tides and the Earth-Moon System

Cited by 17 publications

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Stromatolites and earth—sun—moon dynamics

Stromatolites and earth—sun—moon dynamics

A general circulation model study of the effects of faster rotation rate, enhanced CO2 concentration, and reduced solar forcing: Implications for the faint young sun paradox

Waves, currents, tides—problems and prospects

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A general circulation model study of the effects of faster rotation rate, enhanced CO₂ concentration, and reduced solar forcing: Implications for the faint young sun paradox