<P> The Hadley cell, named after George Hadley, is a global scale tropical atmospheric circulation that features air rising near the equator, flowing poleward at 10--15 kilometers above the surface, descending in the subtropics, and then returning equatorward near the surface . This circulation creates the trade winds, tropical rain - belts and hurricanes, subtropical deserts and the jet streams . </P> <P> In each hemisphere, there is one primary circulation cell known as a Hadley cell and two secondary circulation cells at higher latitudes, between 30 ° and 60 ° latitude known as the Ferrel cell, and beyond 60 ° as the Polar cell . Each Hadley cell operates between zero and 30 to 40 degrees north and south and is mainly responsible for the weather in the equatorial regions of the world . </P>

The circulation of air in hadley cells results in