Influence of direct and indirect tidal effects on geodetic precision measurements in the Netherlands : part II: Ocean load tide effects

In part I of this report the direct tidal effects were treated. These effects arise because of the time varying difference between the attraction of the tide generating body (the moon and the sun, resp.) and the orbit accelleration of the earth. The resulting forces are called body forces. They generate tides of the solid earth - body tides - as well as tides of the oceans (as a free surface) - ocean tides. If we look at body tides we have to deal with direct effects on geodetic measurements, treated in detail in part I. Now we would like to discuss effects coming from mass distributions changing with time whereby these time-changing mass distributions are genereated by the tidal forces. In this case one has to consider the changing water masses of the ocean tides. Within part II of this report the indirect effects connected with ocean tides willl be discussed. Other effects (e.g. due to rotation of the earth or the eustatic sea level change) will not be taken into consideration.