Download Chapter 4 Section 3 pages 103-107

AIR MOVEMENT
Chapter 4 Section 3 pages 103-107
Thursday, October 6, 2011
WHAT CAUSES WIND?
• Wind
is the movement of
air from an area of high
pressure to an area of low
pressure
• Wind
is caused by warm air
rising and cold air sinking
(cold air is more dense)
Thursday, October 6, 2011
http://www.sunwindsolutions.com/
wind_pic1.jpg
WHY DOES THE EARTH RECEIVE
DIFFERENT AMOUNTS OF RADIATION
FROM THE SUN?
• The
Earth is curved
http://
sestechnology.hcpss.wiki
spaces.net/file/view/
earth-3d.gif
Thursday, October 6, 2011
WHAT IS THE DIFFERENCE IN HOW
WARM AIR MOVES COMPARED TO
COLD AIR?
• Warm
rises
• Cold
sinks
air is less dense and
air is more dense and
http://www.acompletesweep.co.uk/balloons/files/
chimney_balloon_before.jpg
Thursday, October 6, 2011
CORIOLIS EFFECT
Thursday, October 6, 2011
CORIOLIS EFFECT
Thursday, October 6, 2011
GLOBAL WINDS- WESTERLIES
• Between
30 and 60 degrees
north and south latitude
• Responsible
for much of the
weather of North America
• Found
on surface
http://www.kidsgeo.com/images/westerlies.gif
Thursday, October 6, 2011
GLOBAL WINDSTRADEWINDS
• Near
30 degrees north and
south latitude
• Blow
in opposite direction
of the westerlies
• Steady
winds that blow in
tropical regions
• Found
Thursday, October 6, 2011
on surface
http://www.kidsgeo.com/images/tradewinds.jpg
GLOBAL WINDS- DOLDRUMS
• Along
the equator
• Windless, rainy
• Found
zone
on surface
http://ntsavanna.com/wp-content/uploads/2006/12/04_hadleys3.jpg
Thursday, October 6, 2011
GLOBAL WINDS-POLAR
EASTERLIES
• Found
near the poles
• Near
north pole, winds
blow from northeast to
southwest
• Near
south pole, winds blow
from southeast to northwest
• Found
Thursday, October 6, 2011
on surface
http://www.kidsgeo.com/images/polar-easterlies.gif
GLOBAL WINDS- JET STREAMS
• Forms
at the boundary
between cold air in the
north and warm air in the
south
• Helps
move storms across
the U.S.
• Pilots
save time and fuel
when flying west to east
http://emsnews.files.wordpress.com/2009/02/jet-stream.gif?w=550&h=371
• Found
Thursday, October 6, 2011
in upper troposphere
LOCAL WINDS- SEA BREEZE
• Created
during the day
• Land
warms faster than
water
• Warm
air over the land
rises, cool air over the water
moves in to the the warm
air’s place creating wind
Thursday, October 6, 2011
http://www.prh.noaa.gov/hnl/kids/seabreeze.gif
LOCAL WINDS- LAND BREEZE
• Occurs
at night
• Land
cools faster than
water
• Warm
air over the sea
rises, cool air over the land
moves in to take the
warm air’s place creating
wind
Thursday, October 6, 2011
https://www.brisbanehotairballooning.com.au/images/landbreeze.gif