intertropical convergence zone

World English Dictionary
Intertropical Convergence Zone (ˌɪntəˈtrɒpɪkəl)
 
n
meteorol ITCZ the zone of deep convection and heavy rainfall in the tropics, esp along or near the equator

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American Heritage
Science Dictionary
intertropical convergence zone   (ĭn'tər-trŏp'ĭ-kəl)  Pronunciation Key 
A broad area of low atmospheric pressure located in the equatorial region where the northeasterly and southeasterly trade winds converge, extending approximately 10° north and south of the equator. As warm, humid air converges on this zone, it rises and cools, forming clouds and frequent, heavy showers. The doldrums occur within the intertropical convergence zone.
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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

intertropical convergence zone

belt of converging trade winds and rising air that encircles the Earth near the Equator. The rising air produces high cloudiness, frequent thunderstorms, and heavy rainfall; the doldrums, oceanic regions of calm surface air, occur within the zone. The ITCZ shifts north and south seasonally with the Sun. Over the Indian Ocean, it undergoes especially large seasonal shifts of 40-45 of latitude.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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