Chapter 22, Section 3
Standards
Chapter 10, Section 2
5a. Students know how differential heating of Earth results in circulation
patterns in the atmosphere and oceans that globally distribute heat.
5b. Students know the relationship between the rotation of Earth and the
circular motions of ocean currents and air in pressure centers.
Objective 1
Explain the Coriolis effect
Objective 2
Objective 3
Describe the global patterns of air circulation and
name the 3 global windbelts.
Identify 2 factors that form local wind patterns.
Assessment
Chapter Test
Review
Daily Bellwork, Science Starters, Standards Practice
Coriolis Effect
The tendency of a moving object to follow a curved path
rather than a straight one because of the rotation of the
Earth is called the CORIOLIS EFFECT.
When air moves towards the poles, it travels east faster than
the land beneath it, following a curved path.
In the Northern Hemisphere wind is deflected to the right
and Southern Hemisphere=left.
Faster the wind or the longer the distance, the greater the
CORIOLIS EFFECT.
Coriolis Effect Video
Global Winds
Each hemisphere has 3 wind belts, or a convection cell (loop)
of wind flow.
TRADE WINDS—winds that flow towards the equator
between 0 and 30 degrees latitude
WESTERLIES– Wind flowing towards the poles but deflected
by the Coriolis effect, between 30 and 60 degrees latitude
POLAR EASTERLIES– Winds that blow east to west between 60
and 90 degrees latitude (near the poles).
JET STREAMS– narrow bands of high-speed winds in the
upper troposphere and lower stratosphere
Local Winds
LAND and SEA BREEZES– Land heats up faster than water
so the air above the land is warmer. This warm air rises
and the cooler air above the sea flows over the land =
SEA BREEZE.
Overnight, land cools quickly but the air over the water
does not. So the warmer air over the water rises and the
cooler land air flows over the water creating a LAND
BREEZE.
VALLEY BREEZE—warm air above a valley blows upslope
MOUNTAIN BREEZE—cool air flows down a mountain
Brainpop WIND
INTERACTIVE/Assessment
Use the diagram
on page 562 or
the one below
and copy and
label it in your
notes.