Polar cells

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Polar Cell are part of a three cell movement involving Hadley Cells and Ferrel Cells which show atmospheric circulation and Surface winds.

Cold dense air descends over the Poles which creates high pressure, this cold air moves along the surface to lower latitudes. At around 60 degrees north and south, this air has been warmed up and rises upwards, creating a zone of low pressure.

See also Polar vortex