1 / 20

News

News. http://www.boston.com/news/local/articles/2009/11/05/environmental_officials_urge_halving_of_phosphorous_levels_in_upper_middle_charles_river/ http://www.boston.com/news/science/articles/2009/11/05/yellowstone_yields_1200_species_in_1_day_study/

yul
Télécharger la présentation

News

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. News • http://www.boston.com/news/local/articles/2009/11/05/environmental_officials_urge_halving_of_phosphorous_levels_in_upper_middle_charles_river/ • http://www.boston.com/news/science/articles/2009/11/05/yellowstone_yields_1200_species_in_1_day_study/ • http://www.boston.com/bostonglobe/editorial_opinion/oped/articles/2009/11/05/with_tax_break_a_big_carbon_footprint/ • http://www.boston.com/business/articles/2009/11/05/clunkers_mileage_impact_queried/ • http://www.cnn.com/2009/TECH/science/11/02/kilimanjaro.glaciers/index.html • http://www.boston.com/lifestyle/green/articles/2009/11/02/5000_years_later_a_new_warming_warning/ • http://www.kansas.com/news/breaking/story/1033346.html

  2. Stratospheric Ozone 2000 m—0.8 bar 5500 m—0.5 bar (18,000 feet) 200-300 nm 75% of Mass below 17 km >390 nm Image courtesy of www.aerospaceweb.org

  3. Light Image courtesy of www.coralnet.ca

  4. Sunlight Spectrum UVA=320-400 nm UVB=280-320 nm UVC=<280 nm

  5. Stratospheric Vs. Tropospheric Ozone Image courtesy of www.aerospaceweb.org

  6. Ozone Depletion • O2 + hv  O + O • O + O2  O3 • O3 + hv (<290 nm)  O2 + O • O3 + Cl  O2 + ClO • ClO + O  O2 + Cl • O3 + O  2O2 • Cl can catalyze destruction of O3 100,000 times

  7. Overall ~5% Global Decrease in Stratospheric Ozone Predicted Figure by UMB OpenCourseWare.

  8. Cancer Causing DNA Breakage due to UV rays Image courtesy of www.assh.org

  9. Melanoma Image courtesy of visualsonline.cancer.gov

  10. Carcinomas Image courtesy of www.seattlecca.org

  11. Antarctic Ozone Hole 5% loss in O3 500% increase at 287 nm Image courtesy of NOAA Research

  12. Polar Vortex, Spring Image courtesy of NASA Goddard Space Flight Center

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

  14. Image courtesy of NASA Goddard Space Flight Center

  15. Index Card • How can we solve this problem?

  16. Solutions US Clean Air Act: Venting of CFC/HCFC Refrigerants Illegal July1, 1992

  17. Regulations Source: NASA

  18. Solved? By 2050 • Hydro Halocarbons (HFCs) • Single manufacturer (Dupont) • Scientific consensus • Simple chemistry Source: www.sabertec.org

  19. Image courtesy of Leland McInnes, Wikipedia

More Related