Global Winds Chapter17. Formation of Wind warmer air = less dense = rising air warmer air = less dense = rising air (lower pressure) colder air = more.

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Presentation transcript:

Global Winds Chapter17

Formation of Wind warmer air = less dense = rising air warmer air = less dense = rising air (lower pressure) colder air = more dense = sinking air colder air = more dense = sinking air (high pressure)

Global Wind Where in the world would there be HIGH pressure? poles Where in the world would there be LOW pressure? equator

HADLEY cells Hot air rises; cold air sinks Vertical motion that causes global wind

What direction to winds flow? Wind flows from HIGH to LOW

Coriolis Effect Earth’s rotation causes wind to: Earth’s rotation causes wind to: curve to the right in the N. Hemisphere ; left in the S. Hemisphere curve to the right in the N. Hemisphere ; left in the S. Hemisphere

What is global wind? -General movement of air worldwide due to pressure differences at the equator and at the poles -caused by temperature difference

Three global wind belts Trade winds (0-30˚) Trade winds (0-30˚) blow from NE Prevailing westerlies (30-60˚) Prevailing westerlies (30-60˚) Blow from SWBlow from SW Polar easterlies ( ˚) Polar easterlies ( ˚) Blow from NEBlow from NE

Reality

Places without wind Doldrums (equatorial low) - zone near the equator O ˚ Doldrums (equatorial low) - zone near the equator O ˚ Horse latitudes (subtropical high)- (30˚) Horse latitudes (subtropical high)- (30˚)

Jet Stream Bands of wind in upper troposphere/lower stratosphere Bands of wind in upper troposphere/lower stratosphere Blows from west to east Blows from west to east North of JS= cold North of JS= cold Moves Pressure systems Moves Pressure systems

What causes wind?

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