The OZONE!!

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The OZONE!!

• By The Green Squirrels
• Names of Team Members
• April 20,2005

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Goals of this presentation

• Inform you of the ozone depletion of course!!
• Background and History
• Chemical Principles
• Some Facts
• HOW IT AFFECTS YOU!

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Why Should You Know about the Ozone.

• YOUyes youare one of the main factors in what
  is causing ozone depletion
• Because of ozone depletion you are susceptible to
  diseases such as cataracts, malignant melanoma,
  etc.
• Ozone depletion affects you and the world we live
  in

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Location, Location, Location

• The Ozone (O3) all around us
• 90 of the Ozone is contained in the stratosphere
  approx. 15 to 50 km above the earth

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STRATOSPHERIC OZONE

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What is this Ozone that I speak of?

• Studies of the upper atmosphere dates back to the
  1800s!
• 1930 Sidney Chapman
• Multiple studies before 1970 do not take into
  account humans
• Click Me

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What The Ozone Does

• Earths Natural Sunscreen
• UV-A relatively harmless causes tanning not
  burning
• UV-B harmful causes sunburn, skin cancer, and
  other disorders
• UV-C extremely harmful but almost completely
  absorbed by ozone

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Causes Of Ozone Depletion

• Chlorofluorocarbons refrigerants, solvents, foam
  blowing agents
• Methyl Chloroform solvent
• Carbon Tetrachloride industrial chemical
• Halons fire extinguishing agents
• Methyl bromide produce and soil fumigant

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all uv-c and most uv-b never reaches the Earths
surface
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Ozone (O3) is a molecule made up of three atoms
of oxygen (O)
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high energy ultraviolet light UV-C
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O2 UV-C photon O O O O2
O3 (ozone) O3 UV-B photon O
O2 O O3 O2
O2
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CHAPMAN CYCLE
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Causes Of Ozone Depletion

• Chlorofluorocarbons refrigerants, solvents, foam
  blowing agents
• Methyl Chloroform solvent
• Carbon Tetrachloride industrial chemical
• Halons fire extinguishing agents
• Methyl bromide produce and soil fumigant

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PROS and CONS of Ozone Depletion

• PROS
• There are no positives to ozone depletion.

• CONS
• Less plant production
• Less frogs and amphibians
• Increase of skin cancer and cataracts in humans

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Ozone Depletion Since 1980
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Affects on Human Health

• Ultra Violet B radiation damages human skin
• Non-melanoma skin Cancer
• Cataracts

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The Antarctic Ozone Hole

• Ozone levels have dropped 33 since 1975
• Most depletion happens from September to December
• 3 5 degree increase in temperature predicted
  for 2020

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Where did all this info come from??

• Barid, Colin, Wendy Gloffke. Chemistry in Your
  Life. W.H. Freeman 2003. New York
• CIESIN Thematic Guides Ozone Depletion and
  Global Environmental Change
• http//www.ciesin.org/TG/OZ/oz-home.html
• Hardy, John T., Climate Change Causes, Effects,
  and Solutions. John Wiley Sons 2003. West
  Sussex, England.
• Miller, Tyler. Environmental Science. Thompson
  Brook/Cole. 2004. California
• http//www.ozonediw.org
• The Ozone Hole
• http//www.theozonehole.com/ozonecreation.htm
• U.S. EPA Ozone Depletion Science
• http//www.epa.gov/ozone/science/index.html