Earth's rotational variations by electromagnetic coupling due to core surface flow on a timescale of ∼1 yr for geomagnetic jerk

Geophysical Journal International

Volumn 179, Issue 1, 2009, Pages 521-535

  Nakada, Masao ^a  

^a KYUSHU UNIVERSITY   (Japan)

Author keywords

Earth rotation variations; Electrical properties; Rapid time variations

Indexed keywords

ELECTRICAL CONDUCTIVITY; ELECTRICAL PROPERTY; ELECTROMAGNETIC METHOD; TIME DEPENDENT BEHAVIOR;

EID: 70349991681     PISSN: 0956540X     EISSN: 1365246X     Source Type: Journal    
DOI: 10.1111/j.1365-246X.2009.04256.x     Document Type: Article

References (55)

1. Amit H, Olson P. Geomagnetic dipole tilt changes induced by core flow. Phys. Earth planet. Inter. 2008, 166:226-238.
2. Bellanger E, Le Mouël JL, Mandea M, Labrosse S. Chandler wobble and geomagnetic jerks. Phys. Earth planet. Inter. 2001, 124:95-103.
3. Bloxham J. The steady part of the secular variation of the Earth's magnetic field. J. geophys. Res. 1992, 97:19 565-19 579.
4. Bloxham J, Dumberry M, Zatman S. The origin of geomagnetic jerks. Nature 2002, 420:65-68.
5. Braginsky SI. Torsional magnetohydrodynamic vibrations in the Earth's core and variations in day length. Geomagn. Aeron. 1970, 10:1-8. English translation
6. Buffett BA. Constraints on magnetic energy and mantle conductivity from the forced nutations of the Earth. J. geophys. Res. 1992, 97:19 581-19 597.
7. Buffett BA, Gurnis M, Wysession ME, Knittle E, Buffett BA. Free oscillations in the length of day: inference of physical properties near the core mantle boundary. The Core-Mantle Boundary Region 1998, Vol. 28:153-165. in, Geodyn. Ser., pp., eds, AGU, Washington, DC, USA
8. Buffett BA, Mathews PM, Herring TA. Modeling of nutation and precession: effects of electromagnetic coupling. J. geophys. Res. 2002, 107(B4):2000. doi
9. Courtillot V, Ducruix J, Le Mouël JL. Sur une accélération récente de la variation séculaire du champ megnétique terrestre. C.R. Acad. Sci. Paris. Ser. D 1978, 287:1095-1098.
10. Dormy E, Mandea M. Tracking geomagnetic impulses at the core-mantle boundary. Earth planet. Sci. Lett. 2005, 237:300-309.
11. Dubrovinsky L. Iron-silica interaction at extreme conditions and electrically conducting layer at the base of Earth's mantle. Science 2003, 422:58-61.
12. Dumberry M, Bloxham J. Inner core tilt and polar motion. Geophys. J. Int. 2002, 151:377-392.
13. Dziewonski AM, Anderson DL. Preliminary reference earth model (PREM). Phys. Earth planet. Inter. 1981, 25:297-356.
14. Eymin C, Hulot G. On core-surface flows inferred from satellite magnetic data. Phys. Earth planet. Inter. 2005, 152:200-220.
15. Gilbert D, Le Mouël JL. Inversion of polar motion data: Chandler wobble, phase jumps, and geomagnetic jerks. J. geophys. Res. 2008, 113:B10405. doi
16. Gilbert D, Holschneider M, Le Mouël JL. Wavelet analysis of the Chandler wobble. J. geophys. Res. 1998, 103:27 069-27 089.
17. Glatzmaier GA, Roberts PH. A three-dimensional convective dynamo solution with rotating and finitely conducting inner core and mantle. Phys. Earth planet. Inter. 1995, 91:63-75.
18. Gubbins D. Geomagnetic field analysis-II. Secular variation consistent with a perfectly conducting core. Geophys. J. R. astr. Soc. 1984, 77:753-766.
19. Gubbins D, Roberts PH, Jacobs JA. Magnetohydrodynamics of the Earth's Core. Geomagnetism 1987, Vol. 2:1-183. in, pp, ed, Academic Press, London
20. Hinderer J, Legros H, Amalvict M. A search for Chandler and nearly diurnal free wobbles using Liouville equations. Geophys. J. R. astr. Soc. 1982, 71:303-332.
21. Holme R. Electromagnetic core-mantle coupling. -I: explaining decadal changes in the length of day. Geophys. J. Int. 1998a, 132:167-180.
22. Holme R, Gurnis M, Wysession ME, Knittle E, Buffett BA. Electromagnetic core-mantle coupling II: probing deep mantle conductance. The Core-Mantle Boundary Region 1998b, Vol. 28:139-151. in, Geodyn. Ser., pp., eds, AGU, Washington, DC, USA
23. Holme R, de Viron O. Geomagnetic jerks and a high-resolution length-of-day profile for core studies. Geophys. J. Int. 2005, 160:435-440.
24. The 9th Generation International Geomagnetic Reference Field. Phys. Earth planet. Inter. 2003, 140:253-254. IAGA, Division V, Working Group 8
25. Jackson A, Bloxham T, Gubbins D, Le Mouël J-L, Smylie DE, Herring T. Time-dependent flow at the core surface and conservation of angular momentum in the coupled core-mantle system. Dynamics of the Earth's Deep Interior and Earth Rotation 1993, Vol. 72:97-107. in, Geophys. Mon. Ser., pp, eds, AGU, Washington, DC, USA
26. Jackson A, Jonkers ART, Walker MR. Four centuries of geomagnetic secular variation from historical records. Philos. Trans. R. Soc. Lond. 2000, 358:957-990.
27. Jault D, Gire C, Le Mouël JL. Westward drift, core motions and exchanges of angular momentum between core and mantle. Nature 1988, 333:353-356.
28. Jeanloz R. The nature of Earth's core. Ann. Rev. Earth planet. Sci. 1990, 18:357-386.
29. Kuang W, Bloxham J. An Earth-like numerical dynamo model. Nature 1997, 389:371-374.
30. Kuang W, Bloxham J. Numerical modelling of magnetohydrodynamic convection in a rapidly rotating spherical shell: weak and strong field dynamo action. J. Comput. Phys. 1999, 153:51-81.
31. Langel RA, Estes RH. A geomagnetic field spectrum. Geophys. Res. Lett. 1982, 9:250-253.
32. Lambeck K. The Earth's Variable Rotation: Geophysical Causes and Consequences 1980, Cambridge University Press, Cambridge
33. Loper DE. Torque balance and energy budget for the precessionally driven dynamo. Phys. Earth planet. Inter. 1975, 11:43-60.
34. Mathews PM, Guo JY. Viscoelectromagnetic coupling in precession-nutation theory. J. geophys. Res. 2005, 110:B02402. doi
35. Mathews PM, Buffett BA, Herring TA, Shapiro II. Forced nutation of the Earth: influence of inner core dynamics: 1. Theory. J. geophys. Res. 1991a, 96:8219-8242.
36. Mathews PM, Buffett BA, Herring TA, Shapiro II. Forced nutation of the Earth: influence of inner core dynamics: 2. Numerical results and comparisons. J. geophys. Res. 1991b, 96:8243-8257.
37. Maus S, Silva L, Hulot G. Can core-surface flow models be used to improve the forecast of the Earth's main magnetic field?. J. geophys. Res. 2008, 113:B08102. doi
38. McCarty DD, Babcock AK. The length of day since 1656. Phys. Earth planet. Inter. 1986, 44:281-292.
39. Munk WH, MacDonald GJF. The Rotation of the Earth: A Geophysical Discussion 1960, Cambridge University Press, Cambridge
40. Nagao H, Iyemori T, Higuchi T, Araki T. Lower mantle conductivity anomalies estimated from geomagnetic jerks. J. geophys. Res. 2003, 108(B5):2254. doi
41. Nakada M. Core-mantle coupling including a viscoelastic inner core: an application to the axial rotation associated with the Quaternary glacial cycles. Phys. Earth planet. Inter. 2003, 138:289-315.
42. Nakada M. Axial and equatorial rotations of the Earth's cores associated with the Quaternary ice age. Phys. Earth planet. Inter. 2006, 154:113-147.
43. Ohta K, Onoda S, Hirose K, Sinmyo R, Shimizu K, Sato N, Ohishi Y, Yasuhara A. The electrical conductivity of post-perovskite in Earth's D" layer. Science 2008, 320:89-91.
44. Olsen N, Mandea M. Investigation of a secular variation impulse using satellite data: the 2003 geomagnetic jerk. Earth planet. Sci. Lett. 2007, 255:94-105.
45. Olsen N, Lühr H, Sabaka TJ, Mandea M, Rother M, Toffner-Clausen L, Choi S. CHAOS-a model of the Earth's magnetic field derived from CHAMP, Ørsted, and SAC-C magnetic satellite data. Geophys. J. Int. 2006, 166:67-75.
46. Olson P, Christensen U, Glatzmaier GA. Numerical modeling of the geodynamo: mechanism of field generation and equilibration. J. geophys. Res. 1999, 104:10 383-10 404.
47. Ono S, Oganov A, Koyama T, Shimizu H. Stability and compressibility of the high-pressure phases of Al2O3 up to 200 GPa: implications for the electrical conductivity of the base of the lower mantle. Earth planet. Sci. Lett. 2006, 246:326-335.
48. Pais MA, Jault D. Quasi-geostrophic flows responsible for the secular variation of the Earth's magnetic field. Geophys. J. Int. 2008, 173:421-443.
49. Pinheiro K, Jackson A. Can a 1-D mantle electrical conductivity model generate magnetic jerk differential time delays?. Geophys. J. Int. 2008, 173:781-792.
50. Rau S, Christensen U, Jackson A, Wicht J. Core flow inversion tested with numerical dynamo models. Geophys. J. Int. 2000, 141:485-497.
51. Rochester MG. The secular decrease of obliquity due to dissipative core-mantle coupling. Geophys. J. R. astr. Soc. 1976, 46:109-126.
52. Sasao T, Okubo S, Saito M, Federov EP, Smith ML, Bender PL. A simple theory on the dynamical effects of a stratified fluid core upon nutational motion of the Earth. 1980, 165-183. in, pp, eds, D. Reidel, Hingham, MA, USA
53. Stacey FD. Physics of the Earth 1992, Brookfield Press, Brisbane, Australia
54. Stix M, Roberts PH. Time-dependent electromagnetic core-mantle coupling. Phys. Earth planet. Inter. 1984, 36:49-60.
55. Wardinski I, Holme R, Asari S, Mandea M. The 2003 geomagnetic jerk and its relation to the core-surface flows. Earth planet. Sci. Lett. 2008, 267:468-481.