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Greenhouse Gases

Greenhouse Gases. 10.5 Chapter 19. Scales of Change. Sun-Earth Heating System. Sun  visible & UV radiation Earth Infrared radiation atmosphere. Greenhouse Gases. H 2 O CO 2 CH 4 N 2 O CFC’s What is their contribution to Global Warming?  Greenhouse warming potential

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Greenhouse Gases

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  1. Greenhouse Gases 10.5 Chapter 19

  2. Scales of Change

  3. Sun-Earth Heating System • Sun visible & UV radiation • Earth Infrared radiation atmosphere

  4. Greenhouse Gases • H2O • CO2 • CH4 • N2O • CFC’s • What is their contribution to Global Warming? • Greenhouse warming potential • How much IR can it absorb? • How long does it persist in the atmosphere?

  5. CO2 in the One to Watch • What is the warming potential? • What is it’s concentration in the atmosphere? • CO2 concentration is so high (390 ppm)

  6. Mount Pinatubo, 1991 CO2 PM (SO2)

  7. Methane • Anaerobic decomposition (anoxic conditions) • Wetlands • Termites • Livestock

  8. N2O and H2O • Denitrification • Evapotranspiration

  9. Anthropogenic Sources of GG’s • Burning of Fossil Fuels • Agricultural Practices • DeforestationLandfills • Industrial Production of Greenhouse Chemicals (CFC’s & HCFC’s)

  10. PM and Global Warming- a Positive Feedback Mechanism • (Black) Soot Reflects light • Soot on Ice/snow

  11. Agricultural Practices • Rice Farming (CH4) • Fertilzers: excess nitrates denitrified (N2O) • Livestock (CH4) • Manure Lagoons (CH4)

  12. Really?

  13. Deforestation CO2 stored is released

  14. Landfills • Industrial production of Chemicals • CFC’s phased out so HCFC are good for ozone but are greenhouse gases

  15. Anthropogenic Sources

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