Air Motion

1
Air Motion

• 37.4 37.5

2
Weather Systems

• Coriolis Effect- deflects moving particles such
  as air to the right above the equator and to the
  left below the equator
• Caused by Earths rotation
• Along with heat imbalance to create wind systems

3
Winds

• Wind is the horizontal the movement of air.
• Winds are a result of a difference in pressure
• Air moves from areas of high pressure to low
  pressure
• The greater the pressure difference, the stronger
  the wind will be.
• There are two main types of wind

4
Local Winds

• Wind that blows over a short distance
• Caused by
• Unequal heating of the Earths surface in a small
  region.
• Land heats up and cools down faster than water.

5
Local Winds
Sea Breeze Winds blow in from the sea and
replace the warmer air inland Land Breeze Winds
blow out from the land into the ocean
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Local Winds
Sea Breeze
Land Breeze
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Global Winds

• Wind that blows over long distances from a
  specific direction
• Caused by
• Unequal heating of the Earths surface in a large
  region.
• Land near the equator tends to be warmer because
  it is at less of an angle to the sun.

8
Global Winds/ convection cells

• Global winds travel in specific directions due to
  large bands called convection cells
• Convection cells are formed by temperature
  variations of the Earths surface
• Warm air rises from the equator, causing a low
  pressure system. Global winds will bring in
  cooler air to replace the void.
• Higher in the atmosphere, winds blow away from
  the equator and towards the poles

Dust winds from satellite
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• Why Global Winds?
• They are called global because they are resulted
  from
• The earths rotation
• The earths movement around the sun
• Because the shape of the world

10
Global Winds
Yellow Polar Easterlies Purple Prevailing
Westerlies Red Trade Winds
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Trade Winds

• Wind belts just north and south of the equator.
• Winds flow from 30 º latitude toward the equator.

NE - SW
SE - NW
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Prevailing Westerlies

• Occurs between 30 º and 60 º latitude in both
  hemispheres
• Move towards the poles from the west to the east

SW - NE
NW - SE
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Polar Easterlies

• Extend from the poles to the 60 º latitude in
  both hemispheres
• Move away from the poles from the east to the west

NE - SW
SE - NW
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Coriolis Effect

• Wind is not attached to the ground.
• Wind appears to follow a curved path
• because of the earths rotation

15
Coriolis Effect
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Jet Stream

• Jet Streams- High-altitude, narrow, westerly wind
  band that occurs above large temperature
  contrasts and can flow as fast as 185 km/h