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  • 1980-1984  (5)
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Year
  • 1
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    The effects of the atmosphere and oceans on the Earth's wobble -- I. Theory (1982)
    Oxford University Press
    Details
    Publication Date: 1982-08-01
    Print ISSN: 0956-540X
    Electronic ISSN: 1365-246X
    Topics: Geosciences
    Published by Oxford University Press on behalf of The Royal Astronomical Society.
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    PAPER CURRENT
  • 2
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    An excitation mechanism for the free 'core nutation' (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The earth is believed to possess a free nutational mode due to its rotating, elliptical, fluid core, with an eigenfrequency of approximately (1 + 1/460) cycle per sidereal day as seen from the sidereally rotating earth. This free 'core nutation' has not yet been undisputably observed. Furthermore, there has been considerable doubt that any known mechanism could excite this mode to an observable level. It is shown here that diurnal atmospheric and oceanic loading of the earth's surface provides an efficient excitation mechanism which depends critically on the physical damping of the mode. Possible effects of the mode on geodetic measurements are discussed. The effects of 'wobble' and 'nutation' on astrometric observations are also considered.
    Keywords: GEOPHYSICS
    Type: Geophysical Journal; 64; 1981
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Effect of the fluid core on changes in the length of day due to long period tides (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The long period luni-solar tidal potential is known to cause periodic changes in the earth's rotation rate. It is found that the effect of a dissipationless fluid outer core is to reduce the amplitudes of these tidal perturbations by about 11 percent. When the fluid core effect is added to Agnew and Farrell's (1978) estimate of the effect of an equilibrium ocean, the result is in accord with observation. The effects of dissipative processes within the fluid core are also examined. Out-of-phase perturbations are found which could be as large as about 10 ms at 18.6 yr. It is concluded, however, that the poorly understood decade fluctuations in the earth's rotation rate will prohibit observation of this effect.
    Keywords: GEOPHYSICS
    Type: Geophysical Journal; 64; 1981
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    A diurnal resonance in the ocean tide and in the earth's load response due to the resonant free 'core nutation' (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The effects of the oceans, which are subject to a resonance due to a free rotational eigenmode of an elliptical, rotating earth with a fluid outer core having an eigenfrequency of (1 + 1/460) cycle/day, on the body tide and nutational response of the earth to the diurnal luni-tidal force are computed. The response of an elastic, rotating, elliptical, oceanless earth with a fluid outer core to a given load distribution on its surface is first considered, and the tidal sea level height for equilibrium and nonequilibrium oceans is examined. Computations of the effects of equilibrium and nonequilibrium oceans on the nutational and deformational responses of the earth are then presented which show small but significant perturbations to the retrograde 18.6-year and prograde six-month nutations, and more important effects on the earth body tide, which is also resonant at the free core notation eigenfrequency.
    Keywords: GEOPHYSICS
    Type: Geophysical Journal; 64; 1981
    Format: text
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  • 5
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    Friction- and mountain-torque estimates from global atmospheric data (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Seasonal, zonal surface torques between the atmosphere and the earth are estimated and compared, using data from a number of independent sources. The mountain torque is computed both from surface pressure data and from isobaric height data. The friction torque is estimated from the oceanic stress data of Hellerman and Rosenstein. Results for the total torque are inferred from atmospheric angular momentum data. Finally, the globally integrated total torque is compared with astronomical observations of the earth's rotation rate. These comparisons help us to assess the quality of the different results. Zonal torques are also computed using results from a GFDL general circulation model of the atmosphere. A comparison with the corresponding results inferred from real data is presented and interpreted in terms of model accuracy.
    Keywords: GEOPHYSICS
    Type: Journal of the Atmospheric Sciences (ISSN 0022-4928); 41; 190-204
    Format: text
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    NASA TECHNICAL REPORTS
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