the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
ESD Ideas: A 6-year oscillation in the whole Earth system?
Anny Cazenave
Julia Pfeffer
Mioara Mandea
Véronique Dehant
Abstract. An oscillation of about 6 years has been reported in Earth’s fluid core motions, magnetic field, rotation, and crustal deformations. Recently, a 6-year cycle has also been detected in several climatic parameters (e.g., sea level, surface temperature, precipitation, land ice, land hydrology, and atmospheric angular momentum). Here we suggest that the 6-year oscillations detected in the Earth’s deep interior, mantle rotation, and atmosphere are linked together, and that the core processes previously proposed as drivers of the 6-year cycle in the Earth’s rotation, cause in addition the atmosphere to oscillate together with the mantle, inducing fluctuations in the climate system with similar periodicities.
Anny Cazenave et al.
Status: open (until 19 Apr 2023)
-
CC1: 'Comment on egusphere-2023-312', Paul PUKITE, 09 Mar 2023
reply
This is such an interesting ESD Idea candidate. The 6 year period is a magic number in terms of the Earth. As an integer it aligns perfectly as a multiple of the annual cycle (obviously) and with the wavenumber=0 symmetry of the lunar nodal cycle Tn=27.2122 days interfering with the lunar anomalistic cycle Ta=27.5545 days. So that 1/Tn - 1/Ta = 1/ (6 y), to amazing precision assuming 365.25 days -- something like 5.9999 years ! What does this imply? As a longitidudinally independent measure it can describe a point in the Moon's orbit whereby the Moon's declination and distance wrt to the Earth are extremes (as well as the Sun given the annual multiple alignment), implying a cyclical extreme torque applied to the axis.
The other 6 year conection pertains to the Chandler wobble, whereby the lunar nodal cycle synchronizes with a semi-annual impulse with an envelope of ~6.4 years, according to modular arithmetic mod(365.25/ 27.2122, 0.5) = 1/433d (Chandler wobble cycle) and so beat envelope of 1/433d - 1/365.25d = 1/6.4y when mixed with the annual cycle. This value is observed in all Chandler wobble measurements when the Chandler wobble is mixed with and thus interferes with the annual wobble, see e.g. https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/98JB02527
Neither of these alignments are often invoked in the literature, as the nodal or draconic cycle is largely dismissed in favor of the tropical or synodic lunar cycle of 27.32 days , which is a longitudinally-centric measure, and thus irrelevant to the spherical symmetry of the Earth's mantle, atmosphere, and axis of rotation inertial moment. See Mathematical Geoenergy (Wiley/AGU, 2018).
Citation: https://doi.org/10.5194/egusphere-2023-312-CC1 -
AC1: 'Reply on CC1', Anny Cazenave, 18 Mar 2023
reply
We thak Dr Pukite for his comment. It is interesting to learn that a 6-year cycle has also been found in some parameters of the Earth-Moon system. However it is not clear to us what type of mechanism linked to the dynamics of the Earth-Moon system could explain our observations. More detailed suggestions would be welcome.
Citation: https://doi.org/10.5194/egusphere-2023-312-AC1
-
AC1: 'Reply on CC1', Anny Cazenave, 18 Mar 2023
reply
Anny Cazenave et al.
Anny Cazenave et al.
Viewed
| HTML | XML | Total | BibTeX | EndNote | |
|---|---|---|---|---|---|
| 271 | 73 | 10 | 354 | 3 | 2 |
- HTML: 271
- PDF: 73
- XML: 10
- Total: 354
- BibTeX: 3
- EndNote: 2
Viewed (geographical distribution)
| Country | # | Views | % |
|---|
| Total: | 0 |
| HTML: | 0 |
| PDF: | 0 |
| XML: | 0 |
- 1