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Izvestiya, Physics of the Solid Earth - Abstract—The influence of the relief on baric tilts is studied. Main attention is focused on two-dimensional problem. It is assumed that variations of... 相似文献
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It is shown that within the framework of the Kolmogorov model the “energy” of the pole E(t) = x
12 + x
22 can be interpreted as a Markovian process. The exact analytical expression has been obtained for the density of the conditional
probability of the quantity E(t) and the problem of the first passage time of the process E(t) has been analyzed. It was shown that the available data on the swing of the function E(t) are not at variance with the Kolmogorov model and a short-period drop of the amplitude of the Chandler wobble in the early
20th century fits this model at Q = 50–200 too; values of Q > 350 are less reasonable. 相似文献
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The modification of spectral analysis especially intended for studying the disturbing functions of the atmosphere and ocean, as well as the observed polar motion (Wiener–Liouville spectrum), is used. The time series of the atmospheric disturbing functions obtained by the U.S. National Centers for Environmental Prediction (NCEP) of the International Earth Rotation and Reference Systems Service (IERS) for the period from January 1, 1980 to June 20, 2014 (http://www.iers.org/.cs1?pid=43-1100116) are analyzed. It is shown that the baric disturbing function contains a regular mode with a period of ~16 months; the contribution of this mode in the polar motion is estimated. 相似文献
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The model values of the mantle quality factor Q=40±20 and the Chandler wobble period T=435–436 days are obtained by numerical modeling of the yearly and Chandler components in the pole motion from data on the angular momenta of the atmosphere and the ocean. The oceanic and the atmospheric excitations account for about 65–70% of the dispersion of the observed pole motion. 相似文献
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The motion of the Earth’s geophysical pole is modeled by numerical integration of the Liouville equations. The dependence of variable parameters of these equations (the period of free nutation T and the quality factor of the shell Q) is examined as a function of time and initial data sets used for constructing geophysical perturbing functions. In particular, we used oceanic perturbing functions constructed from TOPEX/POSEIDON altimetry data. The annual and Chandler components of the pole motion were also modeled. Apart from the subtraction of quadratic trends, initial data were not filtered or averaged. The performed analysis provided model values of T = 425–440 days and Q = 20–60, and Q was found to be somewhat unstable with time. 相似文献
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I. Ya. Tsurkis M. S. Kuchay E. A. Spiridonov 《Izvestiya Physics of the Solid Earth》2012,48(4):339-353
The data series of the International Earth Rotation and Reference Systems Service and National Centers for Environmental Prediction
() for 1982–2003 are analyzed. It is shown that the atmospheric component of polar motion can be treated as the anisotropic
Markov process with discrete time, and the torque exerted by the atmosphere on the solid Earth, as the white noise. The intensity
and characteristic correlation time of the process are estimated. The efficiency of the atmospheric mechanism in the excitation
of the Chandler wobble is estimated in the context of the probabilistic model. 相似文献
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