The other lines of geophysical evidence pertain to the Earth's Length of Day (LOD) and of the Chandler Wobble.
Besides the 28 month quasi-biennial period in the QBO, there is most definitely an odd 1 rad/year frequency component concealed in the time series. This also shows up in the ENSO SOI results, as I demonstrate in the [other thread](http://forum.azimuthproject.org/discussion/1451/enso-proxy-records/#Item_47).
As Gross from JPL has pointed out from his analysis of LOD, there is a connection between the wobble (a beat period of 6 years) and the welling of the deep ocean.
R. S. Gross, “The excitation of the Chandler wobble,” Geophysical Research Letters, vol. 27, no. 15, pp. 2329–2332, 2000.
In this whole area, the lines between what is of a geophysical origin and what is a climactic origin start to blur.