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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'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.
Document ID
19820052776
Document Type
Reprint (Version printed in journal)
Authors
Wahr, J. M.
(Cooperative Institute for Research in Environmental Sciences Boulder, CO, United States)
Sasao, T.
(Colorado Univ. Boulder, CO, United States)
Date Acquired
August 10, 2013
Publication Date
January 1, 1981
Publication Information
Publication: Geophysical Journal
Volume: 64
Subject Category
Geophysics
Funding Number(s)
CONTRACT_GRANT: NAS5-25887
Distribution Limits
Public
Copyright
Other
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