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1) Summary of climate change model and Green house gases; 2) Introduction to kinematics.

1) Summary of climate change model and Green house gases; 2) Introduction to kinematics. Predictions of climate models. Simple model without atmosphere T s 4 = (1-A) S / 4 σ , ---> T s = 255 K . An improved model with atmosphere

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1) Summary of climate change model and Green house gases; 2) Introduction to kinematics.

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  1. 1) Summary of climate change model and Green house gases;2) Introduction to kinematics.

  2. Predictions of climate models Simple model without atmosphere Ts4 = (1-A) S / 4σ,--->Ts = 255 K. An improved model with atmosphere Ts4 = (1-A) S / 4σ + Te4 = 2Te4 =2(1-A) S / 4σ (Assuming Te = 255 K )

  3. Q1 If the surface temperature of the Sun increases by 10%, then the earth temperature (surface) will 1) increase by 46%; 2) increase by 33%; 3) increase by 21%; 4) Increase by 10%.

  4. Q2 Current earth surface temperature is about 30C. If the distance from the earth to the sun is doubled, the surface temperature of the earth is about • 0C; • -10 C; • - 40C; 4) -120C.

  5. 1) Green houses gases like water vapor or carbon dioxide or ozone absorb infrared radiation emitted by the surface of earth, particularly that near the peak of earth radiation and re-emit them. 2) Carbon dioxide emission (increased due to human activities) has an important impact on climate.

  6. A closer look at the infrared region.

  7. Major Constitute of Earth Atmosphere Name Concentration by vol. Concentration by ppm Nitrogen 78 Oxygen 21 Water vapor 0.0001 – 4 0.1 -40,000 Carbon dioxide 0.037 370 Ozone, 0.01 Example: Green house gases

  8. Kinematics • kinematics describes the motion of an object. • Translational kinematics is about the position changes with time. • We describe motion: • use motion diagrams • use graphs

  9. A B C D Q1. Which motion diagram shows an object slowing down. Q2. Which motion diagram shows an object speeding up. Q3. Which motion diagram shows a stationary object Q4. Which motion diagram shows an object moving with a constant speed.

  10. Graphs Position y as a function of time t. y t

  11. Simulation • http://www.colorado.edu/physics/phet/web-pages/simulations-base.html

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