Global Wind System

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Causes of Wind 1. differences in air pressure. -Air flows form areas of higher pressure to areas of lower pressure. 2. uneven heating of the Earth's surface. Wind direction is given as the direction from which the wind comes . For example, a "north wind" blows from north to south. Global Wind Systems

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Global wind systems Equatorial doldrums Horse latitudes

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The Coriolis Effect Because of the earth's rotation, any moving object or fluid will appear to: Turn to the right of its direction of motion in the Northern Hemisphere and Turn to the left of its direction of motion in the Southern Hemisphere . This causes winds to travel clockwise around high pressure systems in the Northern Hemisphere , and counter-clockwise in the Southern Hemisphere . Low pressure winds travel in the opposite direction (counter-clockwise in the Northern Hemisphere and clockwise in the Southern Hemisphere).

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Trade winds- This is air flowing back towards the equator The area near the equator where these winds die out is referred to as the doldrums . Westerlies- this is because of the Coriolis Effect, winds traveling from 30 - 60 degrees north and south of the equator flow from the west to the east. Polar easterlies- The air currents moving along the surface of the Earth from the poles (90 degrees) to 60 degrees north and south of the equator, flow from east to west. Global Wind Systems

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