air movement chapter 4 – section 3 pages 103 - 107
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Air MovementChapter 4 – Section 3
Pages 103 - 107
WindThe movement of air from an area of high pressure (more dense) to an area of low pressure (less dense)
Global Winds
Wind current on a global scale.
Global Temperature Patterns
The sun’s rays are stronger near the equator causing more warming. The air here is warm.
Warm air rises
The sun’s rays are weaker near the poles causing less warming. The air here is cool.
Cool air sinks.
Global Winds
Hadley Cells.
Mr. Fetch’s Earth Science Classroom
The Coriolis Effect
Global Winds
60°S
30°S
0°
30°N
60°N
Prevailing Westerlies- From 30°N to 60°N- Deflected to rightEasterly Trade Winds- From 30°N to O°- Deflected to right
Polar Easterlies- From 90°N to 60°N- Deflected to right
Polar Easterlies- From 90°N to 60°N- Deflected to right
Easterly Trade Winds- From 30°S to 0°- Deflected to leftPrevailing
Westerlies- From 30°S to 60°S- Deflected to leftPolar Easterlies
- From 90°S to 60°S- Deflected to left
Doldrums
Remember, winds are named from where they come.
DoldrumsLow Pressure Zone (warm, less dense air)
along the equatorHeated air expands creating a zone of low pressure
Very little windRains nearly every afternoon
Polar Easterlies
90˚ - 60˚ latitude Winds move east to west Winds rise at 60˚ latitude and sink
at the poles Bring us the cold polar air
Prevailing Westerlies
60˚ - 30˚ latitude Winds move west to east Winds rise at 60˚ and sink at 30˚
Move weather systems across the
United States
Easterly Trade Winds
0˚ - 30˚ latitude Winds move east to west Winds rise at the equator and sink at 30˚ Early sailors used winds to navigate trade routes
JetstreamsNarrow belts of strong winds near the
top of the troposphereWinds move west to east - faster in
winterForm between cold dry air and warm
moist airProduce large weather systemsJets fly faster when flying with Jet
Stream
Jet Stream
Sea BreezeConvection current of air created during the day from the sea to land
Land warms faster than the sea. Warm, less dense air over land rises; cooler, more dense air over sea sinks, creating a cool breeze to blow in from the sea
Sea Breeze
Land BreezeConvection current of air created at night from the land to sea
Land cools faster than the sea. Cooler, more dense air over sinks and moves towards the sea; warmer air over the sea rises, creating a breeze from land to sea
Land Breeze
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