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Earth’s Energy Budget Lesson Plan 2 – Day 2

Earth’s Energy Budget Lesson Plan 2 – Day 2. Bell Work: We know that if the Sun kept inputting energy and it didn't go anywhere, then we would eventually be fried. What do you think happens to this energy? Why don't we all burn up?. Input = Sunlight on one side of Earth. Output = Today.

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Earth’s Energy Budget Lesson Plan 2 – Day 2

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  1. Earth’s Energy BudgetLesson Plan 2 – Day 2

  2. Bell Work: We know that if the Sun kept inputting energy and it didn't go anywhere, then we would eventually be fried. What do you think happens to this energy? Why don't we all burn up?

  3. Input = Sunlight on one side of Earth Output = Today Earth intercepts sunlight Sun emits radiation 30% is reflected

  4. Variables in the Energy Budget • Where on Earth • Pole vs Equator • Reflection • Material type • Clouds • Atmosphere • Absorption and Re-radiation

  5. Follow the Energy

  6. Radiation Energy in the form of invisible waves or rays All objects emit (give- off) radiation. The amount and wavelength range is dependent on the temperature of the object.

  7. Objects Radiate Heat • Earth absorbs and re-radiates energy • In Earth’s Energy Budget, all of Earth is considered together • Air (Atmosphere) • Land (Lithosphere) • Ice (Cryosphere) • Ocean/Water (Hydrosphere) • Life (Biosphere)

  8. Radiation • If energy is absorbed by an object (rocks, water, building), then the temperature of that object increases. • As the temperature increases (hotter), the peak wavelength emitted by the object decreases (becomes shorter wavelengths).

  9. What can you say about re-radiated heat from the Earth? It comes in a range of LONG wavelengths

  10. Input = Sunlight on one side of Earth Output = absorbed and re-radiated Earth intercepts sunlight Sun emits radiation 30% is reflected

  11. Follow the Energy . . . .

  12. Another variable in Energy Budget • A small part of the atmosphere is made of heat-trapping gases. • These gases absorb long wave radiation. • They are called greenhouse gases. • Examples: Water Vapor (H2O), Carbon Dioxide (CO2)

  13. Not all gases have the same behavior Some gases are greenhouse gases. Most of the gases in the atmosphere do NOT absorb long wave radiation.

  14. Follow the Energy

  15. Input = Sunlight on one side of Earth Output = absorbed and re-radiated, heat trapped by greenhouse gases Sun emits radiation Earth intercepts sunlight 30% is reflected

  16. Only a little over half of the absorbed energy is re-radiated. What happens to the other energy?

  17. It remains absorbed by the Earth and causes a change in the global temperature What if there wasn’t an atmosphere?

  18. Concept Map Additions • Long wave radiation • Short wave radiation

  19. http://www.nasa.gov/centers/goddard/news/topstory/2005/earth_energy.htmlhttp://www.nasa.gov/centers/goddard/news/topstory/2005/earth_energy.html

  20. Follow the Energy • VIDEO Energy Budget in Equilibrium

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