NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
The effect of ocean tides on the earth's rotation as predicted by the results of an ocean tide modelThe published ocean tidal angular momentum results of Seiler (1991) are used to predict the effects of the most important semidiurnal, diurnal, and long period ocean tides on the earth's rotation. The separate, as well as combined, effects of ocean tidal currents and sea level height changes on the length-of-day, UT1, and polar motion are computed. The predicted polar motion results reported here account for the presence of the free core nutation and are given in terms of the motion of the celestial ephemeris pole so that they can be compared directly to the results of observations. Outside the retrograde diurnal tidal band, the summed effect of the semidiurnal and diurnal ocean tides studied here predict peak-to-peak polar motion amplitudes as large as 2 mas. Within the retrograde diurnal tidal band, the resonant enhancement caused by the free core nutation leads to predicted polar motion amplitudes as large as 9 mas.
Document ID
19930048273
Document Type
Reprint (Version printed in journal)
Authors
Gross, Richard S. (JPL Pasadena, CA, United States)
Date Acquired
August 16, 2013
Publication Date
February 19, 1993
Publication Information
Publication: Geophysical Research Letters
Volume: 20
Issue: 4
ISSN: 0094-8276
Subject Category
GEOPHYSICS
Distribution Limits
Public
Copyright
Other