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Effect of the fluid core on changes in the length of day due to long period tidesThe 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.
Document ID
19820052778
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Wahr, J. M.
(Colorado Univ. Boulder, CO, United States)
Smith, M. L.
(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
Accession Number
82A36313
Funding Number(s)
CONTRACT_GRANT: NAS5-25887
CONTRACT_GRANT: NSG-7319
Distribution Limits
Public
Copyright
Other

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