It is found that the El Niño — Southern Oscillation (ENSO) is driven not only by the seasonal heating, but also by three more external periodicities (incommensurate to the annual period) associated with the ~ 18.6 - year lunar - solar nutation of the Earth rotation axis, ~ 11 - year sunspot activity cycle and the ~ 14 - month Chandler wobble in the Earth's pole motion. (notrickszone.com)
The two major ways the SIJ does this are called nutation and counter-nutation. (breakingmuscle.com)
I know we can detect current 41kyr nutation in astronomical observations. (tamino.wordpress.com)