52-ME4211 - 3. Criteria on the Stratospheric Ozone...

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3. Criteria on the Stratospheric Ozone Depletion Stratospheric ozone is broken down as a consequence of man- made emissions of halocarbons, i.e. CFCs (chloroflurocarbons), HCFCs , halons (alkenes linked with halogens ) and other long-lived gases containing chlorine and bromine. The ozone content of the stratosphere is therefore decreasing , and since 1985 a dramatic temporary thinning of the ozone layer , often referred to as the " ozone hole ", has been observed each year, over the South Pole. In the last few years the depletion of ozone has also accelerated over the northern hemisphere . As a consequence of this the intensity of hazardous ultraviolet radiation (high energy wavelengths of less than 320 nm, UV- B) at the earth's surface has increased over parts of the southern and northern hemispheres. 1
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Ozone (O3) is an important natural component of the stratosphere . Ozone occurs in scant amounts between about 10 and 50 km above sea level and is most strongly concentrated at an altitude of 20-25 km - the ozone layer. Ozone is
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This note was uploaded on 12/07/2011 for the course ME ME4211 taught by Professor Dr.a.vyas during the Winter '11 term at NYU Poly.

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52-ME4211 - 3. Criteria on the Stratospheric Ozone...

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