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Lesson Plan 2 – Day 1
Earth’s Energy Budget
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Earth’s Energy
• Energy is the ability to change the surroundings– Examples: fuel for a car, ball falling from a
window, electricity to turn on a light
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Budget
• Budget is the amount of incoming or outgoing energy allocated to a system– Money – Time
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Equilibrium
• Equilibrium is the state of balance between things– Emotional – Chemical reactions– Forces
• Equilibrium means that the total amount may change over time, but the proportion in the budget parts stay fairly the same.
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Follow the Energy . . . .
• SUN – EARTH Model
• What in the model is the Sun?
• What in the model is the Earth?– Where is the equator?– Where is the north pole?– Where are you?
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Sun emits
radiation
Earth interceptssunlight
Input = Sunlight on one side of Earth
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Sunlight is Energy
Sunlight comes in a range of SHORT wavelengths called visible light
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Once the sunlight reaches the Earth’s surface, what happens?
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Reflected or Absorbed
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Follow the Energy
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Albedo = Reflection
• How much is reflected?• Scale is 0-1
• White =1, – High reflectivity
• Black = 0– Low reflectivity
• What do you think? High or low albedo?
• Grass• Ice• Rocks• Asphalt• Concrete
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Albedo = Reflection
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Optional Video
• http://www.youtube.com/watch?v=9UJKVa2ClCU&feature=related
• Begin at 1:50. Researcher out on the ice, measuring albedo.
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CLOUDS
• Clouds reflect sunlight and need to be included in the energy budget
• Low thick clouds = high reflection, cools the surface
• High thin clouds = lower reflection and other things (next class), warms the surface
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Sun emits
radiation
Earth interceptssunlight
Input = Sunlight on one side of Earth
30% is reflected
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What happens to the energy that enters the Earth system?
Concept Map – additions• Sun or Sunlight• Earth• Energy Budget• Albedo
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End of Day
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What types of areas of Earth have - a high albedo? - a low albedo?
(think urban, farmland, desert, etc.)
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Earth’s albedoCollected by NASA satellite and averaged. Does not include the ocean and no data for white areas.