Intertropical Convergence Zone
Meteorological phenomenon / From Wikipedia, the free encyclopedia
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"The Calms" redirects here. For other uses, see Calm (disambiguation).
"Doldrums" redirects here. For other uses, see Doldrums (disambiguation).
The Intertropical Convergence Zone (ITCZ /ɪtʃ/ ITCH),[1] known by sailors as the doldrums[2] or the calms because of its monotonous windless weather, is the area where the northeast and the southeast trade winds converge. It encircles Earth near the thermal equator though its specific position varies seasonally. When it lies near the geographic Equator, it is called the near-equatorial trough. Where the ITCZ is drawn into and merges with a monsoonal circulation, it is sometimes referred to as a monsoon trough (a usage that is more common in Australia and parts of Asia).