1. Planetary Atmospheres

2. Terrestrial Planets

3. Venus Completely cloud shrouded Surface atmospheric pressure 100 times Earth’s Surface temp: 870 o F

4. Mars Extremely thin atmosphere Surface pressure.007 times Earth Surface Temperature -58 o F

5. Gaseous atmosphere No real ‘surface’ Liquid and metallic hydrogen interior Earth sized coreJupiter

6. Holding an Atmosphere A bunch of Hydrogen gas (very light) and a bunch of Carbon Dioxide gas (very massive) are at the same temperature. Which has the greatest velocity? A.Hydrogen B. Carbon Dioxide C. They have the same velocity.

7. Kinetic Energy Which has more Kinetic Energy? A)Bowling Ball B)Baseball C)They have the same amount D)Can’t tell

8. Thermal Energy Temperature: The average kinetic energy of a collection of particles

9. Gas Pressure

10. Atmospheric pressure

11. Planetary Temperature

14. Hot Things Emit Light Hotter = MORE light Hotter = Bluer Light

15. Planetary Temperature Energy in = Energy out

16. Planetary Temperature

17. Terrestrial Planets emit PRIMARILY Infrared light

18. The Atmosphere The atmosphere passes visible light And absorbs infrared light

19. Greenhouse Effect Yum! IR Photons!

20. Greenhouse Effect The greenhouse effect keeps a planet warmer than it would be without and atmosphere VISIBLE light passes through the atmosphere The ground ABSORBS the visible light and warms up The warm ground EMITS primarily in the IR Greenhouse gasses ABSORB IR light, effectively trapping some of the energy

21. Atmospheric CO 2

22. Global Warming The ‘Hockey Stick’

23. Moulin

24. Greenland Greenland’s ice would raise ocean levels 20 feet

25. Larson Ice Shelf

26. Breidamerkurjökull This glacier in Iceland has receded 2km since 1973 19732000

27. Pasterze Glacier 18752004

28. Permafrost Permafrost is melting in several areas. The resulting bogs produce methane. Denali Park, Alaska Abisko National Park, Sweden

29. Temperature Measures average KINETIC energy