Noun
Hadley cell (plural Hadley cells)
(meteorology) A global-scale tropical atmospheric circulation that features air rising near the Equator, flowing poleward at a height of 10 to 15 kilometers above the earth's 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.
It divides the Earth into the tropical ( Hadley cell ), mid latitude ( Ferrel cell ), and polar ( polar cell ) regions, to describe energy flow and global atmospheric circulation (mass flow). Source: Internet