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Any idea what a mechanism linking earth's magnetism and climate might be?

I am not a climatologist (or whaever its called) but for a very simple illustration of the relationship of magnetism and climate....

You have seen those little devices that can stir liquids without any mechanical content? Set a beaker down and it amazingly begins to rotate into the familiar vortex form?

That is rotating magnetism at work. on a very very minuscle scale. Take the magnetic energies of our liquid metallic core (causing ocean currents and affecting air currents) - if the core fields shift, then all it affects shifts with it. The Humbolt current (of Kon Tiki fame) runs down the coast of South America all the way through the South Pacific and it's patter affects our west coast in the form of El Nino and La Nina (never could make a tilde)

Imagine the Humbolt current shifting north...North of it would become warmer - south, cooler. Like I said - simplified example. Peru could become a tropical paradise instead of the desert it is now if the current shifted south. Add to that all the other major ocean currents that are more responsible for climate than anything. The western pacific currdnts change and India would become fruitful instead of a combination of barren deserts and flooded plains. Shift that current the other direction and we would have our mid east desert a ways further to the east and Baghdad a Med paradise ?

All because the magnetic fields shifted one way or another.

I have NEVER seen a study of the effects of the polar reversal though - probably near to catastrophic for the urban populations.

The magnetic stirrers I have seen have a plate containing the driver magnet and an encapsulated magnet that is placed in the liquid. A changing magnetic field might cause some effect in water. After all, microwave ovens can heat water. But the changes in the earth's mag field are so slow that the wavength of the photons would be lightyears. Such long wavelengths would not measurably interact with anything so small as the earth's oceans.

I like the other possibility, that earth's atmosphere generates earth's mag field, although it might be that the mag field is induced by ocean currents. The question is whether liquid phase water is better at inducing mag fields than is gas phase water.

This suggestion is necessary but not sufficient evidence that I am a crackpot scientist.