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The Intertropical Convergence Zone, or ITCZ, is the region that circles the Earth, near the equator, where the trade winds of the Northern and Southern Hemispheres come together. The intense sun and warm water of the equator heats the air in the ITCZ, raising its humidity and making it buoyant.
Figure 7u-1 describes the seasonal movement of the intertropical convergence zone and other systems associated with our planetâs global circulation. 1  Figure 7u-1: Seasonal movement of the Earth's global circulation patterns. The major circulation cells are identified on the âEquinoxâ figure. In the âEquinoxâ figure, the intertropical convergence zone (ITCZ) occurs at the equator where the Trade Winds converge creating a low-pressure center and updrafts (red arrows).