Essay on Depletion Of The Ozone Layer

This is the first 1,000 characters of 1161 words (4.64 pages) in the essay titled Depletion Of The Ozone Layer

Depletion Of The Ozone Layer

The ozone layer diminishes more each year. As the area of
polar ozone depletion (commonly called the ozone hole) gets
larger, additional ultraviolet rays are allowed to pass through.
These rays cause cancer, cataracts, and lowered immunity to
diseases.1 What causes the depletion of the ozone layer?

In 1970, Crutzen first showed that nitrogen oxides produced
by decaying nitrous oxide from soil-borne microbes react
catalytically with ozone hastening its depletion. His findings
started research on "global biogeochemical cycles" as well as the
effects of supersonic transport aircraft that release nitrogen
oxide into the stratosphere.2

In 1974, Molina and Rowland found that human-made
chlorofluorocarbons used for making foam, cleaning fluids,
refrigerants, and repellents transform into ozone-depleting
agents.3

Chlorofluorocarbons stay in the atmosphere for several
decades due to their long tropospheric lifetimes. These compounds
are carried into the stratosphere where they undergo hundreds of
catalytic cycles with ozone.4 They are broken down into chlorine
atoms by ultraviolet radiation.5 Chlorine acts as the catalyst
for breaking down atomic oxygen and molecular ozone into two
molecules of molecular oxygen. The basic set of reactions that
involve this process are:
Cl + O3 -->ClO + O2 and
ClO + O -->Cl + O2
The net result:
O3 + O -->2O2

Chlorine is initiall

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