Transcript Atmospheric Heat Convection

Atmospheric Heat
Convection, The Sun &
Wind
Objectives:
Can I recognize events caused by heat
convection?
How is the sun’s energy and wind
connected?
Atmosphere:

A mixture of gases
that surrounds a
planet or moon

Majority of the
sun’s energy is
absorbed by the
land and ocean
when it enters the
atmosphere.
Conduction

Transfer of
thermal energy
through a material.
Radiation
Transfer of energy
through waves.
 The sun’s rays
travel in the form
of radiation to
earth. (Solar
Energy)

Atmospheric Heat Convection:
 thermal
energy circulates in the
atmosphere (through gas or liquid)
 Warm
air rises and cool air sinks
Convection:
Warm Air Rises
Cold Air Sinks
Differences
Which one?
A.
B.
C.
Conduction
Convection
Radiation
Which one?
A.
B.
C.
Conduction
Convection
Radiation
Which one?
A.
B.
C.
Conduction
Convection
Radiation
Conduction, Convection, Radiation?
B
A
C
Convection

Warm air is less
dense than cold air
which makes it rise.

Cold air is more
dense which makes
it sink.
Air Pressure

The closer an object is
to the surface of earth
the greater air pressure.
Air Pressure

At what point will there be the greatest air
pressure?
Air Pressure
At which point will there be the greatest amount of air
pressure?
Barometer

Measures air
pressure.
The Wind
Moving air- caused
by differences in
air pressure when
the atmosphere is
warmed by the
sun.
The greater the
pressure
difference the
faster the wind
moves.
Sea and Land Breeze
During the day:
Air over ocean is cooler….Air
over land warmer. Warm air rises
and moves toward the ocean.
During the night:
Air over ocean is warmer…Air
over land is cooler.
Warm air rises and moves toward
land.
Reality Check
 Can
I recognize events caused by
heat convection?
 How
is the sun’s energy and wind
connected?
Warm air rises at the equator and
sinks at the poles because more solar
energy is received at the equator.
H
L
The sun’s energy
creates pressures
differences in the
Earth’s
atmosphere. As
high pressure
areas are created
around the poles,
cold polar air
(wind) will flow
toward the
equator causing
the wind.
8. Types of Winds:
Heat transfer in our
World!!!
http://www.teachertube.com/viewVid
eo.php?video_id=159713
Reality Check:
 Can
I recognize events caused by heat
convection?
 How is the sun’s energy and wind
connected?
Review Questions:
1. What happens to majority of the
sun’s energy that reaches the Earth’s
atmosphere?
A.
B.
C.
D.
It is absorbed by the land and oceans
It is reflected by the clouds and air
It is absorbed by the ozone layer
It is reflected by the Earth’s surface
2.Which best describes the wind?
A.
B.
C.
D.
Essential the water cycle
Moving air
Static air near the ocean’s surface
A difference in air temperature
3. Why does warm air rise and cold
air sink?
A.
B.
C.
D.
Because warm air is less dense than cold air.
Because cold air is less dense than warm air
Because warm air is denser than cold air
Because warm air has less pressure than cold
air
4. Convection is the method by
which most _____energy circulates
in the atmosphere.
A.
B.
C.
D.
Thermal
Nuclear
Kinetic
Potential
5. Air is warmer and less dense
around the equator because the
equator receives more _____.
A.
B.
C.
D.
Air pressure
Wind
Solar energy
Green house gas
6. When the atmosphere is warmed
by the sun, changes in air pressure
results in the ______.
A.
B.
C.
D.
Wind
Clouds
Humidity
Precipitation
7.
What causes the air rising from the land to be
warm?
A. Heat from the sun
B. Heat from Electricity
C. Heat from a hot spring
D. Heat from decomposition
8. The following happens the
atmosphere:
Solar Energy---Warm air rises----air cools in upper
atmosphere and sinks---air currents
This process can be described as
A. Wind formation (through heat convection)
B. Cloud formation
Heat Convection Lab:

http://www1.teachertube.com/viewVideo.php?
video_id=16655