Transcript 15.3 Winds-P - Cobb Learning

Bell Ringer:
1) Please open
your IAN to
yesterday’s
notes on global
warming.
2) Review our
key tech terms
with the half
sheet in your
blue tubs.
3) Glue it in!
Make sure you
have your
textbook!
Essential Questions:
1) Is Global Warming
Real?
2) How Does the Earth
Cool off?
Final Research: You Decide!
 Question:
Is Global Warming real? Is it a
natural event or man made? Is it natural and
people are making it worse?
 Bill
Nye debate
Let’s Review!
 Explain
research on 2 different points of view for Global
Warming. 5 facts each.
 Try to answer the following questions:

A. What is it?

B. What is causing it?

C. What will change (ocean levels, animal/plant
life)?

D. What might the temperature be in 100 years?

E. What is contributing to it?

F. What are arguments for the ‘natural cycle’ side
of it?
Objectives:
1. Explain the
relationship
between air
pressure and
wind direction.
2. Describe global
wind patterns.
3. Explain the
causes of local
wind patterns.
15.3 Global
Winds and
Local Winds
Copy into your
IAN!
Why Air Moves
Wind-movement
of air is
caused by differences in air
pressure
Greater pressure difference=
faster wind
Air Rises at the Equator and
Sinks at the Poles
 Differences
in air pressure are generally
caused by unequal heating of the Earth.
 Equator




Receives more direct solar energy
Air is warmer and less dense
Warm air rises and creates low pressure
area
Warm air flows to poles
Air Rises at the Equator and
Air Sinks at the Poles, cont’d
 Poles




Air is cooler and more dense
Cold air sinks
Creates high pressure area
Cold air flows toward equator
AIR
will blow from H to L !!!
Pressure Belts Are Found Every
30 Degrees
 Pressure
belts- bands of high pressure and
low pressure found every 30 latitude.
 Sinking
air causes areas of high pressure
because sinking air presses down on the
air beneath it.
PressureBelts
The Coriolis Effect
 Apparent
curving of
the path of winds
and ocean currents
due to the Earth’s
rotation.
 North- winds going
north curve east
 South- winds going
south curve west
 Connection??
Global Winds
Patterns
of air circulation
Named after the direction from
which they blow
Major global wind systems
 Polar
easterlies
 Prevailing Westerlies
 Trade winds
Global winds
Polar Easterlies
 Poles
to 60 latitude in both hemispheres
 Cold,
dense air moves from poles to 60
 Effect?
 Can
bring cold air to US making snow
and freezing weather
Prevailing Westerlies
 30
and 60 latitude in both hemispheres
 Flow
from west to east
 Effect?
 Can
bring moist air to US making rain
and snow
Trade Winds
 30
latitude almost to equator in both
hemispheres
 Due
to Coriolis-curve to west in N.
Hemisphere and east in S. Hemisphere
 Effect?
 Traders
used winds to move from
Europe to Americas.
 Brainpop
Wind
Eactivity link- visual
organizer:
Create one using today’s
tech terms.
Bell Ringer:
In your IAN, please answer
the following questions:
 Take
out your closed notes for 15.3
 Name& Describe 3 examples of
global winds.
 Would
there be winds if the Earth’s
surface were the same temperature
everywhere? Why?
Doldrums:
•located where the trade
winds of the two
hemispheres meet at the
equator
• means “dull” or
“sluggish”
•an area of Low
Pressure
The Horse Latitudes
30
north and south latitude
Very weak winds
Jet Stream: Atmospheric
Conveyor Belts
 Narrow
belts of high speed winds
 Blow in the upper troposphere and
lower stratosphere
 Effect?
 Can
affect movement of storms
and airplane flights
 Cool Fact! Did you Know?
Local Winds
 Move
short distances
 Blow from any direction
 Caused by temperature differences
 Sea
breeze moves from sea to land
 Land breeze moves from land to sea
Sea Breeze
Land Breeze
air moves to complete the cell
H (high pressure)
14°
warm air rising
cool air sinking
18°
air currents move from land to water
7.
2.
6.
4.
5.
C
3.
1.
C
How does wind blow?
Wind will flow
from high to low!!!

What effect does elevation
have on winds??
Mountain Breeze vs,.
Valley Breeze
Wrapping it up:
 What




role does the Sun play?
Sun heats the land and water, changing
temperatures
Different heating causes density
differences, causing wind!
UNEQUAL HEATING CAUSES THE WIND!
Local Winds eactivity
 Brainpop
Wind
Greenhouse vs. Global
Warming One More Time!
 Global
Warming Brainpop