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I am trying to understand what the significance is between the 6.4 year Chandler wobble period in angular momentum changes and the 5.9 year period in length-of-day (LOD) variations.
I wrote this up on my blog and will elaborate more if there is some interest http://contextearth.com/2015/05/25/changes-in-the-angular-momentum-of-the-earth/
I still haven't seen much by the way of research in characterizing ENSO as a forced sloshing model, using the angular momentum modulation factors as input. (Sometimes I have to wonder who makes the decision on what physics to use in climate models. )
Daniel's post on sloppy models has got me thinking of how to push these simplified models.