Ozone_Global

Ozone_Global - Ozone depletion Ozone is formed by reactions...

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Ozone depletion Ozone is formed by reactions initiated by the splitting of O2 and can be destroyed by various catalytic cycles involving the elements nitrogen,chlorine and bromine.The development of a protective ozone screen to shield out harmful solar ultraviolet radiation was an important step in the evolution of advanced forms of life. Ozone absorbs UV radiation in the 200- to 400 nm region. UVA=relatively harmless causes tanning but not burning.UVB=Harmful causes sunburn skin cancer and other disorders.UVC=Extremely harmful but almost compeletely absorbed by ozone. The absorption coeffcient is a measure of how strongly a molecule absorbs electromagnetic radiation of a given wavelength.UVA may lead topremature aging of skin and it can damage the immune system.The wavelengths between about 290 and 320 nm which is UVB radiotion concerns us.At these wavelengths the solar flux is relatively high and the ozone absorption coefficient is relatively low.The biological effect of this radiation is determined by the dose rate which is the number of UV photons per unit time that elad to a specific biological response such as sunburn or skin cancer.Increases in the UVB radiation
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This note was uploaded on 01/16/2011 for the course BUS 460 taught by Professor Dr.hiner during the Fall '10 term at Allen SC.

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Ozone_Global - Ozone depletion Ozone is formed by reactions...

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