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Greenhouse Effect

Greenhouse Effect. Transparent glass allows visible light to enter Warms the interior as it is absorbed Covering prevents the heat from leaving Reflects the energy back inside and prevents winds from carrying it away. Greenhouse Effect. Electromagnetic Spectrum. incoming. outgoing.

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Greenhouse Effect

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  1. Greenhouse Effect Transparent glass allows visible light to enter Warms the interior as it is absorbed Covering prevents the heat from leaving Reflects the energy back inside and prevents winds from carrying it away.

  2. Greenhouse Effect

  3. Electromagnetic Spectrum incoming outgoing

  4. What is the greenhouse effect? • Earth absorbs incoming solar radiation (all wave lengths) • Earth emits long wave infrared radiation • Infrared radiation is absorbed by greenhouse gases

  5. What the gases do Greenhouse gases • transparent to short wave but absorb long wave radiation • atmosphere stores energy • Earth’s surface is ~33C warmer

  6. Greenhouse Gases • Water Vapor (H2)) • Carbon Dioxide (CO2) • Methane (CH4) • Nitrogen Oxide (N2O) • Chlorofluorocarbons (CFCs)

  7. Amounts of greenhouse gases

  8. The Goldilocks Principle Atmosphere: mass 90x earth’s GH Gases: >90% CO2 Sfc. Temp.: 477C GH Effect: 523C Venus • GH Gases: ~0.04% CO2 • ~ 1% H2O • Sfc. Temp.: 15C • GH Effect: 33C Earth Atmosphere: mass <1% earth’s GH Gases: >80% CO2 Sfc. Temp.: -47C GH Effect: 10C Mars Sun FAR TOO HOT! Just Right!!! FAR TOO COLD!

  9. Summary Explain why the greenhouse Effect is essential to life on earth as we know it.

  10. Enhanced Effect Data showing the increasing concentration of Greenhouse Gases: • CO2 is steadily increasing at the rate of about 1 ppm per year

  11. Methane (CH4) • CH4 is only recently been measured. Rate of increase is about 10 ppb per year. • However, since 1 CH4 molecule is worth 25 CO2 molecules, the equivalent growth rate in terms of CO2 is 2.5 ppm. Thus methane will eventually be the dominant enhanced greenhouse gas in our atmosphere.

  12. Conclusion Why should we be concerned about an increase in greenhouse gases in the atmosphere? Impact Presentations tomorrow!

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