Topographic core-mantle coupling and polar motion on decadal time-scales

Geophysical Journal International

Volumn 125, Issue 2, 1996, Pages 599-607

  Hide, R ^a,b   Boggs, D H ^a   Dickey, J O ^a   Dong, D ^a   Gross, R S ^a   Jackson, A ^c  

^a CALIFORNIA INSTITUTE OF TECHNOLOGY   (United States)

^b UNIVERSITY OF OXFORD   (United Kingdom)

^c UNIVERSITY OF LEEDS   (United Kingdom)

Author keywords

Core mantle boundary; Dynamics; Earth's core; Earth's interior; Earth's rotation; Geomagnetism; Planetary oblateness; Topography

Indexed keywords

CORE; CORE/MANTLE BOUNDARY; PLANETARY OBLATENESS; PLANETARY ROTATION; TOPOGRAPHY; TORQUE;

EID: 0029778541     PISSN: 0956540X     EISSN: None     Source Type: Journal    
DOI: 10.1111/j.1365-246X.1996.tb00022.x     Document Type: Article

References (52)

1. Backus, G., 1968. Kinematics of geomagnetic secular variation in a perfectly conducting core, Phil. Trans. R. Soc. Lond., A, 263, 239-266.
2. Backus, G. & Le Mouël, J.-L., 1986. The region of the core-mantle boundary where a geostrophic velocity field can be determined from frozen-flux magnetic data, Geophys. J. R. astr. Soc., 85, 617-628.
3. Bloxham, J. & Jackson, A., 1991. Fluid flow near the surface of the Earth's outer core, Rev. Geophys., 29, 97-120.
4. Bondi, H. & Gold, T., 1950. On the generation of magnetism by fluid motion, Mon. Not. R. astr. Soc., 110, 607-611.
5. Denis, C. & Ibrahim, A., 1981. On a self-consistent representation of Earth models, with application to the computing of internal flattening, Bull. Géod., 55, 179-195.
6. Dickman, S.R., 1981. Investigation of controversial polar motion features using homogeneous International Latitude Service data, J. geophys. Res., 86, 4904-4912.
7. Elsasser, W.M., 1939. On the origin of the Earth's magnetic field, Phys. Rev., 55, 489-500.
8. Elsasser, W.M., 1947. Induction effects in terrestrial magnetism, Part III, Electric modes, Phys. Rev., 72, 821-833.
9. Eubanks, T.M., 1993. Variations in the orientation of the Earth, in Contributions of space geodesy to geodynamics: Earth dynamics, pp. 1-54, eds Smith, D.E. & Turcotte, D.L., Am. Geophys. Un., Washington, DC.
10. Frenkel, J., 1945. On the origin of terrestrial magnetism, C. R. Acad. Sci. USSR, 49, 98-101.
11. Gire, C. & Le Mouël, J.-L., 1990. Tangentially-geostrophic flow at the core-mantle boundary compatible with the observed geomagnetic secular variation: the large-scale component of the flow, Phys. Earth planet. Inter., 59, 259-287.
12. Greff-Lefftz, M. & Legros, H., 1995. Core-mantle coupling and polar motion, Phys. Earth planet. Inter., 91, 273-283.
13. Gross, R.S., 1982. A determination and analysis of polar motion, PhD thesis, University of Colorado, Boulder, CO.
14. Gross, R.S., 1990. The secular drift of the rotation pole, in Earth rotation and coordinate reference frames, pp. 146-153, eds Boucher, C. & Wilkins, G.A., Springer-Verlag, New York, NY.
15. Gwinn, C.R., Herring, T.A. & Shapiro, I.I., 1986. Geodesy by radio interferometry: Studies of the forced nutations of the Earth 2. Interpretation, J. geophys. Res., 91, 4755-4765.
16. Herring, T.A., Buffett, P.M., Mathews, P.M. & Shapiro, I.I., 1991. Forced nutations of the Earth: Influence of inner core dynamics. Very Long Baseline Interferometry data analysis, J. geophys. Res., 96, 8259-8273.
17. Hide, R., 1956. The hydrodynamics of the Earth's core, Phys. Chem. Earth, 1, 94-137.
18. Hide, R., 1969. Interaction of the Earth's liquid core and solid mantle, Nature, 222, 1055-1056.
19. Hide, R., 1986. Presidential address: The Earth's differential rotation, Q. J. R. astr. Soc., 27, 3-14.
20. Hide, R., 1989. Fluctuations in the Earth's rotation and the topography of the core-mantle interface, Phil. Trans. R. Soc. Lond., A, 328, 351-363.
21. Hide, R., 1995. The topographic torque on the bounding surface of a rotating gravitating fluid and the excitation by core motions of decadal fluctuations in the Earth's rotation, Geophys. Res. Lett., 22, 961-964 and 3563-3565.
22. Hide, R. & Dickey, J.O., 1991. Earth's variable rotation, Science, 253, 629-637.
23. Hide, R., Clayton, R.W., Hager, B.H., Spieth, M.A. & Voorhies, C.V., 1993. Topographic core-mantle coupling and fluctuations in the Earth's rotation, in Relating geophysical structures and processes: The Jeffreys volume, eds Aki, K. & Dmowska, R., Geophys. Monog. Am. Geophys. Un., 76, 107-120.
24. Hills, R.G., 1979. Convection in the Earth's mantle due to viscous shear at the core-mantle interface and due to large-scale buoyancy, PhD thesis, New Mexico State University, Las Cruces.
25. Hinderer, J., Jault, D., Legros, H. & Le Mouël, J.-L., 1987. Geomagnetic secular variation, core motions and implications for the Earth's wobble, Phys. Earth planet. Inter., 49, 121-132.
26. Hinderer, J., Jault, D., Legros, H. & Le Mouël, J.-L., 1990. Core-mantle topographic torque: a spherical harmonic approach and implications for the excitation of the Earth's rotation by core motions, Phys. Earth planet. Inter., 59, 329-341.
27. Hulot, G., Le Mouël, J.-L. & Wahr, J.M., 1992. Taking into account truncation problems and geomagnetic model accuracy in assessing computed flows at the core-mantle boundary, Geophys. J. Int., 108, 224-246.
28. Hulot, G., Le Huy, M. & Le Mouël, J.-L., 1996. Influence of core flows on the decade variations of the polar motion, Geophys. astrophys. Fluid Dyn., in press.
29. Inglis, D.R., 1955, Theories of the Earth's magnetism, Rev. Mod. Phys., 27, 212-248.
30. Jackson, A., 1989. The Earth's magnetic field at the core-mantle boundary, PhD thesis, University of Cambridge, Cambridge.
31. Jacobs, J.A., ed., 1987-91. Geomagnetism (4 volumes), Academic Press, London.
32. Jault, D. & Le Mouël, J.-L., 1989. Topographic torque associated with tangentially-geostrophic motion at the core surface and inferences on the flow inside the core, Geophys. astrophys. Fluid Dyn., 48, 273-296.
33. Jault, D. & Le Mouël, J.-L., 1990. Core-mantle boundary shape: constraints inferred from the pressure torque acting between the core and mantle, Geophys. J. Int., 101, 233-241.
34. Jault, D. & Le Mouël, J.-L., 1993. Circulation in the liquid core and coupling with the mantle, Adv. Space Res., 13, 221-233.
35. Kuehne, J. & Wilson, C.R., 1991. Terrestrial water storage and polar motion, J. geophys. Res., 96, 4337-4345.
36. Lambeck, K., 1980. The Earth's variable rotation, Cambridge University Press, Cambridge.
37. Le Mouël, J.-L., 1984. Outer-core geostrophic flow and secular variation of the Earth's magnetic field, Nature, 311, 734-735.
38. Le Mouël, J.-L., Gire, C. & Madden, T., 1985. Motions at the core surface in the geostrophic approximation, Phys. Earth. planet. Inter., 39, 270-287.
39. Loper, D.E. & Lay, T., 1995. The core-mantle boundary region, J. geophys. Res., 100, 6397-6420.
40. Merrill, R.T. & McElhinny, M.W., 1983. The Earth's magnetic field, Academic Press, London.
41. Moritz, H. & Mueller, I.I., 1987. Earth rotation: theory and observation, Ungar Publishing Company, New York, NY.
42. Munk, W.H. & MacDonald, G.J.F, 1960. The rotation of the Earth, Cambridge University Press, Cambridge.
43. Roberts, P.H. & Scott, S., 1965. On the analysis of the secular variation, 1: A hydromagnetic constraint: Theory, J. Geomagn. Geoelect., 17, 137-151.
44. Rochester, M.G., 1984. Causes of fluctuations in the Earth's rotation, Phil. trans. R. Soc. Lond., A, 313, 95-105.
45. Rosen, R.D., 1993. The axial momentum balance of Earth and its fluid envelope, Surveys Geophys., 14, 1-29.
46. Stacey, F.D., 1992. Physics of the Earth, 3rd edn, Brookfield Press, Brisbane.
47. Voorhies, C.V., 1991. Coupling an inviscid core to an electrically-conducting mantle, J. Geomagn. Geoelect., 43, 131-156.
48. Wahr, J.M., 1988. The Earth's rotation, Ann. Rev. Earth planet. Sci., 16, 231-249.
49. Wilson, C.R., 1993. Contributions of water mass redistribution to polar motion excitation, in Contributions of space geodesy to geodynamics: Earth dynamics, pp. 77-82, eds Smith, D.E. & Turcotte, D.L., Am. Geophys. Un., Geodynamics Ser. Vol. 24, Washington, DC.
50. Wilson, C.R. & Vicente, R.O., 1980. An analysis of the homogeneous ILS polar motion series, Geophys. J. R. astr. Soc., 62, 605-616.
51. Yumi, S. & Yokoyama, K., 1980. Results of the International Latitude Service in a homogeneous system, 1899.9-1979.0, Publication of the Central Bureau of the International Polar Motion Service and the International Latitude Observatory of Mizusawa, Mizusawa, Japan.
52. Zhao, M. & Dong, D., 1988. A new search for the secular polar motion in this century, in The Earth's rotation and reference frames for geodesy and geodynamics, pp. 385-392, eds Babock, A.F. & Wilkins, G.A., Reidel, Dordrecht.