An analysis of tidal variations in the length of day.

Details An analysis of tidal variations in the length of day. An analysis of tidal variations in the length of day.

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993geoji.114..341m&link_type=abstract

Geophysical Journal International, Vol. 114, No. 2, p. 341 - 346

Physics

7

Scientific paper

Observations of the length of day, corrected for the effects of variations in the angular momentum due to changes in wind velocity and atmospheric pressure, ocean-tide heights and currents, and solid-Earth zonal tides, were analysed. The (1992) IERS Standards model for the effects of zonal tides on the Earth's rotation, which includes ocean-tidal effects, adequately accounts for the observations of the high-frequency (periods between one and 30 days) variations in the length of day at the present level of accuracy. A currently unexplained semi-annual variation in the length of day remains, but this may be due to the unmodelled effects of stratospheric winds. The power spectrum of the remaining variations with periods less than 20 days is essentially that of a white-noise process. The amplitudes of the remaining unexplained variations in length of day are less than 30 microseconds.

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