Stratospheric Ozone Absorbs Harmful UV

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Presentation transcript:

Stratospheric Ozone Absorbs Harmful UV

Atmospheric Ozone O3 O3

Stratospheric Ozone Absorbs Harmful UV Rays sunburn causing UV Sunburn effect (as measured by the UV Index) is the product of the sunlight power spectrum (radiation intensity) and the erythemal action spectrum (skin sensitivity) across the range of UV wavelengths. http://www.youtube.com/watch?v=WE3y1Gj2dec

Total amount O3 remains constant 240nm 280nm O2 -> O + O then O + O2 -> O3 O3 -> O2 + O 240nm 280nm Short wavelength UV splits O2, freeing up O to combine with another O2 to make ozone Longer wavelength UV does the opposite, breaking apart ozone molecules

Ozone is broken down by Cl/Br that rises into the stratosphere 1 2 Chloro- flourocarbons (CFC’s) are one source of Cl 3 4 5 6 http://www.theozonehole.com/ozonedestruction.htm http://www.youtube.com/watch?v=YSZY8dihDXk&feature=related

Global phase out of CFCs began in 1987…

…but the damage to the ozone layer lingers Predicted complete repair - 2050 http://earthobservatory.nasa.gov/Features/WorldOfChange/ozone.php

Montreal Protocol 1972 1987 unanimous international agreement to eliminate the use of ozone depleting chemicals CFC phase out by 2000 (developed nations) and 2010 (developing nations) HCFC phase out: 90%n by 2015; 100% by 2030 Arguably the most successful environmental global action in history

…puts the planet on the road to restoration Predicted complete repair by 2050 http://earthobservatory.nasa.gov/Features/WorldOfChange/ozone.php

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