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-HADLEY cell circulates air between topics and subtropics (approximates real world well). Warm air rises at the equator-As the flow moves poleward, it begins to cool and sinks at 20Â°-35Â° latitude.-Trade winds meet at the equator, in a region with a weak pressure gradient, called the doldrums.-FERREL cell circulates air in the middle latitudes. -Circulation (at 60Â°-90Â°) within a POLAR cell produces polar easterlies, or surface flows that move toward the equator.Trade winds meet at the equator, in a region with a weak pressure gradient, called the doldrums. -FERREL cell circulates air in the middle latitudes. -Circulation (at 60Â°-90Â°) within a POLAR cell produces polar easterlies, or surface flows that move toward the equator.
Two additional belts of circulating air exist in the temperate latitudes (between 30Â° and 60Â° latitude) and near the poles (between 60Â° and 90Â° latitude). Figure 2: Hadley cells and prevailing winds. Solar warming of the tropics drives atmospheric circulation in three cells. Rotation of the Earth generates Coriolis forces that create the easterly trade winds below 30Â° latitude and polar easterlies above 60Â° latitude.