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The Greenhouse Effect (8.6)

The Greenhouse Effect (8.6). The Greenhouse Effect . How does the climate system trap energy to keep Earth warm? Gases in the atmosphere absorbed the IR radiation emmitted by the earth and radiate it in all directions Half gets sent back to earth to warm it up even more

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The Greenhouse Effect (8.6)

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  1. The Greenhouse Effect (8.6)

  2. The Greenhouse Effect • How does the climate system trap energy to keep Earth warm? • Gases in the atmosphere absorbed the IR radiation emmitted by the earth and radiate it in all directions • Half gets sent back to earth to warm it up even more • The energy trapping process is called the greenhouse effect!

  3. Greenhouse gases MAJOR • Carbon Dioxide • 0.0385% of atmosphere (not a lot!) • Causes ¼ of natural greenhouse effect • Natural sources: volcanoes, burning organic matter, cell respiration • Water Vapour • 2/3 of Earth’s natural greenhouse effect • Amount varies from very little to 4% of atmosphere MINOR • Methane • Much less in atmosphere but 23x more effective than CO2 • Natural sources: plant decomposition • Ozone • Acts as greenhouse gas in troposphere • Nitrous Oxide • Very little in atmosphere but 300x more effective than CO2 • Natural Source: reactions of bacteria in soil

  4. Videos! • https://www.youtube.com/watch?v=Hi3ERes0h84 • http://ed.ted.com/lessons/climate-change-earth-s-giant-game-of-tetris-joss-fong#review

  5. Energy Transfer within the climate system (8.8)

  6. Energy Transfer in the Atmosphere • Convection current: • Air near the equator warms up, rises and spreads and then the cooler air drops and the cycle repeats • This causes winds that are predictable • Prevailing winds help push warm air and water to the poles • Another factor in determining climate zones!

  7. Energy Transfer in the Oceans • Thermohaline circulation: • At the poles, surface water freezes and leaves saltier colder water which is more dense and sinks to the bottom • This allows warmer surface water from the equator to flow to the poles • Acts as a conveyer belt carrying water from the equator to the poles • Ocean currents can also be caused by winds • Have a strong effect on climates of land nearby • Warm water  warm moist air  warms land  rain • Cold water  cool dry air  cools land  desert

  8. https://www.youtube.com/watch?v=ajQ3hm5JidU

  9. HOMEWORK! • Read pg. 338-347 • Questions: • Pg. 342 #1-3, 6 • Pg. 347 #1, 3, 6-7

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