Download Factors Affecting Insolation

New Topic: Atmosphere & Weather
Objectives:
1.To know the meaning of key terms.
2.To name the layers of the atmosphere.
3.To describe the changing characteristics
of the atmosphere with altitude.
Key Term Bingo!
Troposphere
Tropopause
Stratosphere
Albedo
Conduction
Convection
L-W Radiation
S-W Radiation
Latent Heat
Mist
Fog
Coriolis Force
Fohn Wind
Orographic
Rainfall
Rain Shadow
Katabatic Wind
Anabatic Wind
Adiabatic
Cooling
Dew
Evaporation
Layers of the Atmosphere
• Use the information on the worksheet to
complete a graph showing the layers of
the atmosphere.
Objectives:
1. To understand how energy from the Sun is passed to the Earth.
2. To describe the factors affecting insolation.
3. To explain why the Equator doesn’t warm up and Poles don’t cool down
despite them receiving different amounts of insolation.
TO DO:
1. Feedback Q1-4 (5).
(10)
2. Energy in the Atmosphere: Look at diagrams A&B on sheet and complete Q5&6.
3. The Heat Budget: Slide 2 & diagram C. (5)
Heat Loss: Complete Q7. (5)
(5)
One of the reasons for uneven heating of Earth’s surface: How
curvature of the Earth affects the altitude of the Sun – Slide 3.
Horizontal Transfers Q8 & 9 (see slide 4 for Ocean Currents) (10)
4. Factors Affecting Insolation: Q10 (see slide 5&6 for Seasonal Changes). (20)
HW = Questions on ‘Global Temperature Patterns’ sheet.
The Heat Budget
• The Earth is not heating up or cooling down (as
a result of insolation it receives).
• There is a positive heat balance within the
tropics (i.e. incoming insolation > outgoing
terrestrial radiation).
• There is a negative heat balance at the poles
(high latitudes) as well as at high altitudes due to
outgoing terrestrial radiation > incoming
insolation.
• Transfer of energy occurs to prevent tropics from
overheating and poles from becoming too cold.
As the angle of the sun in the sky decreases…
the land
40°N
area heated by a given ray increases
the depth
of the atmosphere though which
the ray passes increases
Earth
Equator
Sun
therefore the amount of insolation lost
also increases
40°S
so the higher the latitude the lower the
temperature.
The Changing Position of the Overhead Sun
Vernal equinox – neither N/S pole
has inclination towards the sun.
Earth’s axis makes a 90° with a
line drawn to the sun at the
Equator.
Spring
Summer
Summer Solstice - N. Pole axis
leans at 23.5° towards the sun.
Suns rays at noon are 90° over
Tropic of Cancer.
Winter solstice – S Pole axis
leans at 23.5° towards the sun.
Sun’s rays at noon are 90°
over Tropic of Capricorn.
Winter
Autumn
Autumnal equinox – day
and night equal (12 hours
each).
The Changing Position of the Overhead Sun for the
Northern Hemisphere