Results 41 to 50 of about 11,470 (155)
Meteorological excitation of the annual polar motion [PDF]
Geophysical Journal International, 1982 Summary. Numerous studies have indicated that the annual term in the polar motion cannot be explained in any detail by meteorological/hydrological excitation and no reasonable alternative excitations have been put forward. Part of the problem has been that the hydrostatic adjustment of the oceans to the atmospheric pressure changes has traditionally ...
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Hydrological excitations of polar motion, 1993-2002 [PDF]
Geophysical Journal International, 2005 SUMMARY Changes in continental water storage obtained from an advanced land data assimilation system (LDAS) are employed to compute hydrological excitations of polar motion for the 10-yr period of 1993‐2002. The results are compared with observed excitations of polar motion and contributions from the atmosphere and ocean, and with results from previous
J. L. Chen, C. R. Wilson
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Further evidence for oceanic excitation of polar motion [PDF]
Geophysical Journal International, 1999 SUMMARY While the role of the atmosphere in driving variations in polar motion is well established, the importance of the oceans has been recognized only recently. Further evidence for the role of the oceans in the excitation of polar motion is presented.
J. Nastula, R. M. Ponte
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On the excitation of the Earth' polar motion
Geophysical Research Letters, 1985 One of the conclusions reached by recent studies of Barnes et al. and later Hide was “that atmospheric excitation alone was sufficient to account for the observed polar motion over (the studied) period, that there is apparently no need to invoke substantial excitation either by the fluid core or …earthquakes.” The purpose of the present paper is to ...
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Low‐frequency excitation of length of day and polar motion by the atmosphere [PDF]
Journal of Geophysical Research: Solid Earth, 2004 Results of a 100‐year run of the Hadley Centre general circulation model are used to compute monthly values of the three components of atmospheric torque on the Earth and of the associated atmospheric angular momentum series. All these results are compared with equivalent ones from the National Center for Environmental Prediction/National Center for ...
de Viron, Olivier +3 more
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On Some Natures of the Excitation and Damping of the Polar Motion [PDF]
Symposium - International Astronomical Union, 1972 Values of the Chandlerian period and the damping coefficient of the polar motion are calculated for every ten years from 1900.0 to 1970.0, using a method developed by Sekiguchi (1966). The damping coefficient is variable between 0.074 and 0.008 (yr)−1 through this period, and correlative with the variation of the Chandlerian period, as Sekiguchi (1961)
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On Random Excitation and Damping of the Polar Motion [PDF]
Symposium - International Astronomical Union, 1980 The paper deals with the behavior of the Earth's pole when exclusively random excitations are at work (e.g. internal displacements of matter, treated as a process of stochastic character). The title of the paper is similar to that of a paper of N. Sekiguchi whose probabilistic final deductions are very ingenious.
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Consistent atmospheric and oceanic excitation of the Earth's free polar motion [PDF]
Geophysical Journal International, 2004 SUMMARY Earth orientation parameters as observed by space-geodetic techniques show a broad spectrum of frequencies. Many efforts have been made to relate spectral peaks to geophysical processes, such as atmospheric or oceanic variations. However, the mechanisms of excitation of some typical oscillations are still unclear.
Seitz, F., Struck, J., Thomas, M.
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Earth, Planets and SpaceThe clear ~ 6-year beat in the polar motion data has allowed us to consider the Chandler period (P) as ~ 1.2 years, albeit approximately, from solely the observed polar motion data.
Ryuji Yamaguchi, Masato Furuya
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Effects of Huge Earthquakes on Earth Rotation and the length of Day
Terrestrial, Atmospheric and Oceanic Sciences, 2013 We calculated the co-seismic Earth rotation changes for several typical great earthquakes since 1960 based on Dahlen¡¦s analytical expression of Earth inertia moment change, the excitation functions of polar motion and, variation in the length of a day ...
Changyi Xu, Wenke Sun, Xin Zhou
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