Actually the center of Antarctica is an area of high pressure: http://www.antarctica.gov.au/about-antarctica/environment/weather
And the idea in the Wiki that the area around the earth gradually drops to absolute zero is hard to fathom. The atmosphere would turn to liquid long before absolute zero, and so that liquid air would either pool on the surface or possibly flow back towards the center and also outwards. I don't think a giant lake of liquid air could hold in our atmosphere as the wiki entry posits. And since cold air is much heavier than warm air, it also seems that long before the air was at a low enough temperature to liquefy, it would tend to flow under the hotter air in the center of our earth, which again would cool the area we live on drastically.
And I am curious why you would refer to the Wiki when it clearly is suggesting that the earth fits the unipolar model. Do you personally believe that Antarctica is a continent or an ice ring around the earth? Or are you undecided, so you refer to both models as needed to answer questions?
And how would you answer this question in regards to a bipolar model? What lies beyond the area of the flat earth that we live on in the bipolar model? More ocean? A different ice ring? Why have humans not traveled beyond the edge in the bipolar model if there is no ice ring patrolled by armed guards stopping them? In the bipolar model, why are there warm areas near the edge of the earth and cold areas (the poles) surrounded by warm areas? In the globe earth, there is one central band of warmer temps around the equator that then gradually cools as one approaches the poles. How do the cold areas form in the middle of the large circular warm areas that would seem to exist on the bipolar map if the sun circles the poles as you described in another thread. And why wouldn't the oceans on the side of the south pole that is farther away from the the north pole than the south pole itself freeze in the southern winter when the sun gets nowhere near them. The area around the south pole tends to form more ice in the southern winter, so why wouldn't the area beyond the south pole which is also in constant darkness freeze during the southern winter?
As usual, the flat earth model raises many more questions than it ever answers.