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Polar Motion — An Overview

Published online by Cambridge University Press:  12 April 2016

Dennis D. McCarthy*
Affiliation:
U. S. Naval Observatory, 3450 Massachusetts Ave., NW, Washington DC 20392-5420, USA, e-mail: [email protected]

Abstract

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After one hundred years of intensive study, some aspects of polar motion remain poorly understood. This motion of the Earth’s axis of rotation with respect to its mantle and crust has been observed and studied since the creation of the International Latitude Service. Research has shown that the motion of the pole is quite complicated and distinguished by components over all time scales. Observationally, the secular, Chandler and annual components of polar motion are well documented, and various geophysical processes have been suggested as likely causes. Other components such as the approximately thirty-year motion, the high-frequency motion and the daily/sub-daily motion remain as subjects of extensive research.

Type
Scientific Sessions
Copyright
Copyright © Astronomical Society of the Pacific 2000

References

Brosche, P., Wünsch, J., Maier-Reimer, E., Segschneider, J., and Sündermann, J., 1997, “The axial angular momentum of the general circulation of the oceans,” Astron. Nachr., 318, pp. 193199.CrossRefGoogle Scholar
Brosche, P. and Schuh, H., 1998, “Tides and Earth Rotation,” Surveys in Geophysics, 19, pp. 417430.Google Scholar
Capitaine, N., Guinot, B., and McCarthy, D.D., “The Celestial Ephemeris Origin and the definition of UT1 in the International Conventional Reference Frame, Astron. Astrophys., in press.Google Scholar
de Viron, O., Bizouard, C., Salstein, D., and Dehant, V., 1999, “Atmospheric torque on the Earth rotation and comparison with atmospheric angular momentum variations,” J. Geophys. Res., 104, pp. 48614875.Google Scholar
Dickman, S.R., 1998, “Determination of oceanic dynamic barometer corrections to atmospheric excitation of Earth rotation,” J. Geophys. Res., 103, pp. 112715143.Google Scholar
Eubanks, T.M., 1993, “Variations in the Orientation of the Earth,” in Contributions of Space Geodesy to Geodynamics: Earth Dynamics, American Geophysical Union, Washington, DC.Google Scholar
Dickey, O., Gegout, P., and Marcus, S.L., 1999, “Earth-Atmosphere Exchange and ENSO: The Rotational Signature of the 1997-1998 Event,” Geophys. Res. Lett., 26, pp. 24772480.Google Scholar
Greiner-Mai, H., 1997, “Possible relations between the rotational axis of the inner Earth’s core and the magnetic dipole axis,” Astron. Nachr., 318, pp. 6374.Google Scholar
Gross, R.S., Chao, B.F., and Desai, S.D., 1998, “Effect of Long-Period Ocean Tides on the Earth’s Polar Motion,” Progress in Oceanography, 40, pp. 385397.Google Scholar
Gu, Z., 1996, “The study of excitation of the earthquake to Earth’s rotation,” Earth, Moon, and Planets, 74, pp. 3547.Google Scholar
Höpfner, J., 1996, “Polar motion at seasonal frequencies,” J. Geodyn., 22, pp. 5161.Google Scholar
Johnston, P. and Lambeck, K., 1999, “Postglacial rebound and sea level contributions to changes in the geoid and the Earth’s rotation axis,” Geophys. J. Int., 136, pp. 537558.Google Scholar
Kołaczek, B., Nuzhdina, M., Nastula, J., and Kosek, W., 2000, “El Niño impact on atmospheric polar motion excitation,” J. Geophys. Res., 105, pp. 30813087.Google Scholar
Lambeck, K., 1980, The Earth’s variable rotation, Cambridge University Press, Cambridge, 449 pp.Google Scholar
McCarthy, D.D., 1996, IERS Conventions, IERS Technical Note, 21, Observatoire de Paris, Paris.Google Scholar
Mireault, Y., Kouba, J., and Ray, J., 1999, “IGS Earth rotation parameters,’ GPS Solutions, 3, pp. 5972.Google Scholar
Mitrovica, J.X. and Milne, G.A., 1999, “Glaciation-induced perturbations in the Earth’s rotation: A new appraisal,” J. Geophys. Res., 103, pp. 9851005.Google Scholar
Molodensky, S.M. and Groten, E., 1998, “On the dynamical effects of a heterogeneous and compressible liquid core in the theory of Chandler wobble,” Geophys. J. Int., 135, pp. 723726.Google Scholar
Munk, W.H. and MacDonald, G.J.F., 1960, The Rotation of the Earth, a Geophysical Discussion, Cambridge University Press, Cambridge, 323 pp.Google Scholar
Nastula, J. and Ponte, R.M., 1999, “Further evidence for oceanic excitation of polar motion,” Geophys. J. Int., 139, pp. 123130.Google Scholar
Pan, C., 1999, “Angular momentum perturbation, polar motion excitation and axial near-symmetry,” Geophys. J. Int., 136, pp. 139148.Google Scholar
Ponte, R.. M. Stammer, D., and Marshall, J., 1998, “Oceanic signals in observed motions of the Earth’s pole of rotation,” Nature, 91, pp. 476479.Google Scholar
Rochester, M., 1973, “The Earth’s Rotation,” EOS, Transactions American Geophysical Union, 54, pp. 769781.Google Scholar
Sidorenkov, N.S., 1997, “The Effect of El-Niño Oscillation on the Excitation of the Chandler Motion of the Earth Pole,” Astronomicheskii Zhurnal, 74, pp. 792795.Google Scholar
Vicente, R.O., and Wilson, C.R., 1997, “On the Variability of the Chandler Frequency,” J. Geophys. Res., 102, pp. 2043920445.Google Scholar
Vondrák, J., Ron, C., and Pesek, I., 1997, “Earth rotation in the Hipparcos reference frame,” Cel. Mech. and Dynam. Astron., 66, pp. 115122.Google Scholar
Vondrák, J., 1999, “Earth Rotation Parameters 1899.7-1992.0 after Reanalysis within the Hipparcos Frame,” Surv. Geophys., 20, pp. 165195.Google Scholar
Yu, N.H. and Zheng, D.W., 1998, “Oceanic angular momentum and its excitation to the Earth rotation variations,” Progress in Astronomy, 16, pp. 3540.Google Scholar