Question

why do the poles experience permanent high pressure?

Answer 1

Hello mate,

Here is your answer,

The descending air causes high pressures, called the polar highs. The south polar high is stronger than the north because it is over land. The density of the atmosphere near the surface is not constant, in other words. At the poles it is very cold and dense, and the equator it is warm and less dense.

The cold temperatures in the polar regions cause air to descend to create the high pressure (a process called subsidence), just as the warm temperatures around the equator cause air to rise to create the low pressure intertropical convergence zone.