A REFINED MODEL FOR THE INFLUENCE OF OCEAN TIDES ON UT1 AND POLAR MOTION

Periodic changes in Universal Time and polar motion have been derived from a numerical ocean model for a number of small partial tides. Comb ined with the results reported earlier our model now includes the 34 m ost important constituents of degree 2 (measured by the amplitude of t he tidal potential). The results show that the terms neglected in all existing models amount to 80 mu s in UT1 and to 0.3 mas in polar motio n.