Articles | Volume 14, issue 4
https://doi.org/10.5194/esd-14-733-2023
Special issue:
https://doi.org/10.5194/esd-14-733-2023
ESD Ideas
 | 
04 Aug 2023
ESD Ideas |  | 04 Aug 2023

ESD Ideas: A 6-year oscillation in the whole Earth system?

Anny Cazenave, Julia Pfeffer, Mioara Mandea, and Veronique Dehant

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Cited articles

Abarca del Rio, R., Gambis, D., and Salstein, D. A.: Interannual signals in length of day and atmospheric angular momentum, Ann. Geophys., 18, 347–364, https://doi.org/10.1007/s00585-000-0347-9, 2000.  
Chao, B. F.: Dynamics of axial torsional libration under the mantle-inner core gravitational interaction, J. Geophys. Res.-Sol. Ea., 122, 560–571, 2017. 
Chao, B. F. and Yu, Y.: Variation of the equatorial moments of inertia associated with a 6-year westward rotary motion in the Earth, Earth Planet Sci. Lett., 542, 116316, https://doi.org/10.1016/j.epsl.2020.116316, 2020. 
Chen, J., Wilson, C. R., Kuang, W., and Chao, B. F.: Interannual oscillations in Earth Rotation, J. Geophys. Res.-Sol. Ea., 124, 13404–13414, https://doi.org/10.1029/2019JB018541, 2019. 
Ding, H. and Chao, B. F.: A 6-year westward rotary motion in the Earth: Detection and possible MICG coupling mechanism, Earth Planet. Sc. Lett., 495, 50–55, https://doi.org/10.1016/j.epsl.2018.05.009, 2018. 
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While a 6-year oscillation has been reported for some time in the motions of the fluid outer core of the Earth, in the magnetic field and in the Earth rotation, novel results indicate that the climate system also oscillates at this 6-year frequency. This strongly suggests the existence of coupling mechanisms affecting the Earth system as a whole, from the deep Earth interior to the surface fluid envelopes.
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