1. News
mix/TNjKKIEJaaKm6ZNwwDxqhN/story.html
figure-raises-concerns/16L3cdhlqmxt8CrQFZAWfJ/story.html

2. Stratospheric Ozone 2000 m—0.8 bar 5500 m—0.5 bar (18,000 feet)nm
75% of Mass
below
17 km
>390 nm

3. Light
Image courtesy of NASA:

4. Blackbody Radiation
Image courtesy of Wikipedia:

5. Sunlight Spectrum UVA=320-400 nm UVB=280-320 nm UVC=<280 nm
Image courtesy of Wikipedia:

6. Stratospheric vs. Tropospheric Ozone
Image courtesy of Wikipedia:

7. Ozone Depletion O2 + hv (<240 nm)  O + O O + O2  O3
O3 + O  2O2 (Naturally slow)
O3 + Cl  O2 + ClO
ClO + O  O2 + Cl
O3 + O  2O2 (Catalytically fast)
Cl can catalyze destruction of O3 100,000 times

8. Reactions

9. Overall ~5% Global Decrease in Stratospheric Ozone Predicted

10. Cancer Causing DNA Breakage due to UV rays
Image courtesy of Wikipedia:

11. Melanoma
Image courtesy of Wikipedia:

12. Carcinomas
Image courtesy of Wikipedia:

13. Shift in Norms
Image shared with CC BY-SA 3.0 courtesy of Fotopedia:

14. Antarctic Ozone Depletion (Spring)
Graphic created by UMB OpenCourseware

15. Antarctic Ozone Hole

16. Polar Vortex, Spring
Image courtesy of NASA

17. Polar Stratospheric Clouds (PSC)
Antarctic Spring
Polar Vortex
Stratospheric clouds made of ice (nitric acid)
Sunlight initiate reactions
Heterogeneous chemistry (on particles)

18. Image courtesy of EPA: http://www. epa

19. Index Card
How can we solve this problem?

20. Solutions

21. Regulations

22. Solved? By 2050 Hydro Halocarbons (HFCs) Single manufacturer (Dupont)
Scientific consensus
Simple chemistry
Image courtesy of Wikipedia:

23. Image courtesy of Wikipedia: http://upload. wikimedia