How can circulation cells transfer heat?

Air warmed at the equator rises causing low pressure. They move north and south to create HADLEY CELLS. At latitudes of 30° north and south, the air cools and sinks, creating high pressure. Some cool air flow back to the equator as SURFACE TRADE WINDS, and the rest move towards the poles firing the FERREL CELLS. At attitudes 60° north and south, the warm air from the ferrel cells meet the cold polar air at the polar fronts. A polar jet stream is formed above this, driving unstable atmosphere. The warmer air rises forming POLAR CELLS which travels north or south towards the poles, sinking to form high pressured areas.