What causes the natural 60-year climate cycle? A new theory

From a comment by Bart, elevated to a post:

What is the cause of the ~60 year quasi-cycle? I noticed this just a little while ago.

The Earth's rotation axis is nutating with a period of about 18.6 years. However, that is only part of the story. In actual fact, the nutation takes the form of an elliptical cone, as shown here:



The distance between the J2000 polar axis and the actual rotation axis looks like this. Its period is necessarily halved, to about 9.3 years:



Thus, the magnitude of the component of the magnetic moment of the Sun along the Earth's rotation axis should have periods of about

T1 = 11*9.3/(11+9.3) = 5 years

T2 = 11*9.3/(11-9.3) = 60 years

Coincidence? Maybe. But, is there not a 5-ish year quasi-periodicity to the major temperature sets? Hard to say for sure, but there surely are several ups and downs which are in the neighborhood of 5 years:

-Bart

Thanks Bart, I would add that a Fourier analysis does suggest a 5 year periodicity of the HADCRU surface temperature dataset, as well as the well-known 60 year climate cycle:

Several papers relating the 60 year climate cycle to solar activity, ocean oscillations [which are in-turn driven by solar activity], and lunar-tidal cycles:

New paper relates natural 60 year climate cycle to the effects of solar activity and cosmic rays

New paper finds planetary motions explain climate; predicts stable climate

New paper finds natural variability accounts for > 50% of long-term temperature change in many regions over past century

Paper: At least 60% of global warming since 1970 is natural

'Polar vortex' that caused record cold is related to solar activity, not man-made CO2

New paper shows how natural ocean oscillations control climate





Fourier analysis of HADCRU surface temperatures, sunspots, PDO, AMO. The AMO shows the closest correlation with solar activity.

Fourier Analysis of Climate: Next ~50 yrs Cooler

Dr. Pokrovsky also finds good agreement between the ~60 year AMO cycle and Arctic ice extent:

60-year periodicity in the PDO during the instrument era (first graph) and from paleoclimate reconstructions (second graph).

Pacific sea surface temperatures also show a periodicity of ~60 years in this wavelet analysis