greenhouse gases and energy budget lesson plan 3 – day 1 1
TRANSCRIPT
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Greenhouse Gases and Energy Budget
Lesson Plan 3 – Day 1
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What are greenhouse gases?
Where do they come from?
How do they work?
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If the amount of energy that comes in to Earth is the same amount of
energy that goes out of Earth, how can our planet stay warm?
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A greenhouse . . .
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What is the greenhouse effect?
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Composition of the Earth’s Atmosphere
• Nitrogen N2 = 78 %
• Oxygen O2 = 21 %
• Argon Ar = 0.9 %• Other = <0.1%
– Carbon Dioxide CO2
– Methane CH4
– Nitrous Oxide NO2
– Ozone O3
– Hydrogen
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Greenhouse Gases
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Carbon Dioxide
Water
Methane
Nitrous Oxide
Ozone
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The “Goldilocks” Principle
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Mars is too cold, Venus is too hot, and Earth is just right!
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What if Earth did not have greenhouse gases?
Main Greenhouse Gases
CO2 and H2O
Estimated temperature
without greenhouse gases
-5 °C (23 °F)
Actual average temperature
15 °C (59 °F)
Temperature change because of greenhouse gases
20 °C (36 °F)
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Frequency
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More Complete (and complex!) Energy Balance Model
Incoming Solar Radiation = Outgoing Radiation13