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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.
Because of the rotation of the earth and the coriolis force, air is deflected to the right in the Northern Hemisphere. As a result, the movement of air in the polar cell circulation produces the polar easterlies. In the circulation cell that exists between 60Â° and 30Â° north, the movement of air produces the prevailing westerlies. In the tropic circulation cell, the northeast trade winds are produced.