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If you go back tens of millions of years ago there were dinosaurs in polar regions. Of course it was much warmer then

https://www.smithsonianmag.com/history/the-strange-lives-of-...

https://en.wikipedia.org/wiki/South_Polar_region_of_the_Cret...

The dinosaurs in the polar reason isn't because it was warmer, it's because the Strait of Magellan were closed.

One of the reasons we are in an ice age right now (which refers to a period where you have periodicly advancing and retreating glaciers) is because you have a continent on the pole and a clear sea lane around it, before the Strait of Magellan opened you have a current that circulated between the poles and equater evening out the temperatures allowing for ice free poles.

The same three atmospheric cells exist in the northern hemisphere and there is no continent there. Why is that?

https://en.wikipedia.org/wiki/Atmospheric_circulation

Those are different, this is about water circulation not air circulation, water has a much higher specific heat so it it's far more important when it comes to temperature circulation.

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