214
S. S. Krylov et al.
Fig. 15.7 Earth pole oscillations according to the IERS observations and measurements (discrete
data) in comparison with the calculated oscillations caused by perturbations of: a atmosphere and
b ocean
oscillations of the angle of deviation δ along the equator of the point of intersection of the equator with the lunar orbit is constructed. The main harmonic with the
precession frequency of the lunar orbit for the observed pole motion is shown by the
red line, and the blue dots are for the calculated motion taking into account geophysical perturbations. The oscillations caused by geophysical perturbations have much
smaller amplitude and shifted phase, which indicate more complex physical nature
of these oscillations and the incompleteness of the disturbances taken into account.
15.6 Conclusions
Variations in the main components parameters of the Earth pole motion are due to
the effect of the combined nature. The considered main geophysical perturbations
are apparently part of the coherent oscillations of various media. Not more than
50% of the energy of the considered oscillatory process is due to perturbations of
the atmosphere and the ocean. Since the impact of other geophysical fluids on the
Earth pole motion is much smaller, this process should be more global in nature and
such variations in the Earth’s environment can be affected. Then, their excitation
S. S. Krylov et al.
Fig. 15.7 Earth pole oscillations according to the IERS observations and measurements (discrete
data) in comparison with the calculated oscillations caused by perturbations of: a atmosphere and
b ocean
oscillations of the angle of deviation δ along the equator of the point of intersection of the equator with the lunar orbit is constructed. The main harmonic with the
precession frequency of the lunar orbit for the observed pole motion is shown by the
red line, and the blue dots are for the calculated motion taking into account geophysical perturbations. The oscillations caused by geophysical perturbations have much
smaller amplitude and shifted phase, which indicate more complex physical nature
of these oscillations and the incompleteness of the disturbances taken into account.
15.6 Conclusions
Variations in the main components parameters of the Earth pole motion are due to
the effect of the combined nature. The considered main geophysical perturbations
are apparently part of the coherent oscillations of various media. Not more than
50% of the energy of the considered oscillatory process is due to perturbations of
the atmosphere and the ocean. Since the impact of other geophysical fluids on the
Earth pole motion is much smaller, this process should be more global in nature and
such variations in the Earth’s environment can be affected. Then, their excitation