1. My Research By: Ms. Williams June 29, 2004

2. Warm-Up Activity

3. Aerosol-Cloud-Climate Interactions

4. Aerosol 1 : a suspension of fine solid or liquid particles in gas

5. Cloud 1 : a visible mass of particles of condensed vapor (as water or ice) suspended in the atmosphere of a planet (as the earth) or moon

6. Climate 2 a : the average course or condition of the weather at a place usually over a period of years as exhibited by temperature, wind velocity, and precipitation

7. Aerosol-Cloud-Climate Interactions AerosolCloud Climate Direct Effect Indirect Effect

8. The sun emits short- wave radiation towards to earth The Earth re-emits long-wave radiation back towards space Fun Fact Without Earth's atmosphere, temperatures would climb to over 2000°F (93°C) during the day and fall to 280°F (138°C) below zero at night.

9. Direct Effect Aerosol Climate Aerosols scatter solar radiation

10. Direct Effect Aerosol Climate Aerosols absorb terrestrial radiation

11. Light Scattering Demonstration

12. Clouds-Climate Cloud Climate Clouds also intercept solar radiation

13. Why does it feel cooler on a cloudy day? Sunny Day @ the Beach Cloudy Day @ the Beach

14. Cloud Formation Demonstration I

15. Cloud Formation

16. Cloud Formation Demonstration II

17. Cloud Formation Clouds form in regions of the atmosphere where water vapor is supersaturated. However, the water vapor must condense on aerosol particles to form clouds Aerosols that become a cloud drop Cloud AerosolCloud

18. Why do clouds not form everywhere water vapor exists? Cloud RegionsWater Vapor Regions

19. 1 st Indirect Effect AerosolCloud More polluted: Smaller drops Less polluted: Larger drops Fun Fact: The droplets of water or ice in a cloud are about 70 times smaller than the period at the end of this sentence.

20. 1 st Indirect Effect AerosolCloud

21. Why is the crushed ice brighter than the cubed ice?

22. 2 nd Indirect Effect AerosolCloud Time

23. Why do clouds get darker right before it rains?

24. What is the overall impact? IPCC, 2001

25. How does this affect us? Climate is a delicate system Predict future climate trends Predict consequences of current actions “ The Day After Tomorrow”

26. Other Aerosol Impacts Acid Rain Acid Rain Anthropogenic (man- made) aerosols Anthropogenic (man- made) aerosols Vegetation Damage Vegetation Damage Ecological system Ecological system Health Respiratory Effects Visibility Smog, Fog, Haze, etc…

27. ?? Questions ??

28. Recap Aerosol Climate  Direct Effect: -Aerosols absorb and scatter Sun’s Radiation AerosolCloud  Indirect Effects: -Clouds need aerosols to form Cloud Climate Clouds Reflect Sunlight From Space Clouds Reflect Sunlight From Space Clouds reflect more and live longer as the number of aerosols increase Clouds reflect more and live longer as the number of aerosols increase

29. Recap AerosolCloud Climate Direct Effect Indirect Effect

30. Exit Ticket