trade winds

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trade winds, movement of air toward the equator, from the NE in the Northern Hemisphere and from the SE in the Southern Hemisphere. The trade winds originate on the equatorial sides of the horse latitudes, which are two belts of high air pressure, one lying between 25° and 30° north of the equator and the other lying between 25° and 30° south of it. The high air pressure in these belts forces air to move toward a belt of low air pressure along the equator called the doldrums. The air converging at the doldrums rises high over the earth, recirculates poleward, and sinks back toward the earth's surface in the region of the horse latitudes, thus completing a cycle. The air does not move directly north or south because it is deflected by the rotation of the earth. See wind; Coriolis effect.

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trade winds Old maritime term, much used in meteorology, indicating the steadiness of direction of the prevailing tropical easterly winds, which blow from subtropical high-pressure areas in latitudes 30–40° north and south, generally north-easterly in the northern hemisphere and south-easterly in the southern hemisphere. They are most nearly constant in latitudes centred on 15° north and south. Climatic conditions associated with the belt vary from fine anticyclonic weather in the poleward and eastern margins, caused by subsidence, to stormier conditions near the equator and western margins, caused by less stable, deeper, moist air.

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trade winds An old maritime term, much used in meteorology to describe the prevailing tropical easterly winds, which blow in a steady direction from subtropical high-pressure areas in latitudes 30–40°N and S, generally north-easterly in the northern hemisphere and south-easterly in the southern hemisphere. They are most nearly constant in latitudes centred on 15°N and S. Climatic conditions associated with the belt vary from fine anticyclonic weather in the poleward and eastern margins, caused by subsidence, to stormier conditions near the equator and western margins, caused by less stable, deeper, moist air.

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trade wind / wind/ • n. a wind blowing steadily toward the equator from the northeast in the northern hemisphere or the southeast in the southern hemisphere, esp. at sea. Two belts of trade winds encircle the earth, blowing from the tropical high-pressure belts to the low-pressure zone at the equator.

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trade winds Steady wind that blows westwards towards the Equator from subtropical high pressure zones between latitudes 30° and 40° n and s.