The Greenhouse Effect and Global Warming , What is it? How does it occur? - PowerPoint PPT Presentation

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The Greenhouse Effect and Global Warming , What is it? How does it occur?

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  1. The Greenhouse Effect and Global Warming, What is it? How does it occur? Carl N. Drummond Dean, College of Arts and Sciences Science Café, November 30, 2010

  2. The Global Energy Balance Energy from the Sun Terrestrial Radiation

  3. Sun: 6000K, Q = 3.87 x 10^26 W, S0 = 1367 W/m^2

  4. The Sun is cool ! Infrared Ultraviolet 6000 K Max Planck, 1900 Intensity 5000 K 4000 K Wavelength

  5. Solar Flux S0 = 1367 W/m^2 A = πr^2 Earth’s Incoming Solar Radiation SI = S0πr^2 / 4 πr^2 SI = S0 / 4 SI = 342 W/M^2 So what happens to all this energy?

  6. The Global Energy Balance Albedo

  7. Surface Albedo 0.7 0.3 Stratocumulus Cirrus

  8. The Greenhouse Effect Has Nothing to do with Greenhouses Carbon Dioxide Water Vapor

  9. Sun Earth Water Gap CO2 Greenhouse

  10. Venus : 96% CO2, 92 bar S0 = 2632 W/m^2 Te = 230 K Ts = 760 K = 980°F GHE = 530 K 0.77 Earth: 0.007% CO2, 1 bar S0 = 1367 W/m^2 Te = 250 K Ts = 288 K = 58°F GHE = 38 K 0.30 Mars: 95 % CO2, 0.006 bar S0 = 589 W/m^2 Te = 220 K Ts = 230 K = - 45°F GHE = 10 K 0.24 0.12

  11. So what are the facts?

  12. Direct Measurements Glacial Ice Bubbles

  13. CH2O + O2 → CO2 + H2O

  14. Planting Trees Will Not Help So where will all the CO2 go?

  15. The Triumvirate of the Global Carbon Cycle Jacques Joseph Ebelmen (1814 – 1852) Ecole des Mines Harold C. Urey (1893 – 1981) Univ. of Chicago Robert A. Berner (1935 – ) Yale

  16. Greenland Ice = 7 m of global sea level

  17. Thermal Expansion of Surface Sea Water (2 cm) • Melting of Alpine Glaciers (2.5 cm) • Melting of Greenland and Antarctic Ice Caps (2 cm)