Do Now

1
Do Now In Binders

• Describe how wind is created.
• What is the relationship between density and
  pressure?
• What happens to air pressure as I hike up a
  mountain?
• What instrument measures air pressure?

2
Global Winds
What roles do composition, structure, and
properties play in our atmosphere?
3
Coriolis Effect

• Because the Earth rotates, and consists of a
  mixture of land and sea, the Coriolis Effect
  exists
• The Coriolis Effect is the movement of particles
  (such as air) to the right in the Northern
  Hemisphere
• How about the South?
• They move to the left

4
Coriolis Effect
5
Global Winds

• Global wind patterns are caused by
• Coriolis Effect
• The land and sea makeup of Earth

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Cold Moist Air Rises
Cold Moist Air Rises
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Very Cold Air Sinks
Cold Moist Air Rises
Cold Moist Air Rises
Very Cold Air Sinks
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Very Cold Air Sinks
Cold Moist Air Rises
Cold Moist Air Rises
Very Cold Air Sinks
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Wind Moves from HIGH to LOW
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Objects are deflected to the RIGHT in the
Northern Hemisphere
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Remember!

• Wind gets its name
• from the
• direction it is blowing
• FROM!

15
Northern Wind Patterns

• Polar Easterlies
• 90 60 latitude from the east
• Prevailing Westerlies
• 60 30 latitude from the west
• Trade winds
• 30 0 latitude from the East

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Latitude Nicknames

• Horse Latitudes
• 30 latitude
• Named because the boats stalled and the horses
  had to go!
• Doldrums / Intertropical Convergence Zone (ITCZ)
• Equator
• Trade winds converge from north and south
• Named because boats also got stranded here

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Jet Streams

• Jet Streams form at latitudes where wind systems
  come together
• High speed westerly winds form high above the
  surface