The Trades form under the Hadley circulation cell, and are part of the return flow for this cell. The Hadley carries air aloft at the equator and transports it poleward north and south. At about 30°N/S latitude, the air cools and descends.
The warming of the ocean in the tropical Pacific increases the strength of the Hadley circulation (a global wind pattern) and causes the entire tropics to warm.
cellular circulation"In the general circulation context, circulation in the latitude-height plane as exemplified by Hadley circulation. See Hadley cell, Ferrel cell.
cellular cloud pattern"See open cells, closed cells.
 See also: Water, Norther, Surface, Period, Hemisphere
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