R and V Works FF6 Informações Técnicas descarregar pdf (Página 73)

Compressor Application Manual

Some CFCs can live in the atmosphere for more

than 120 years, that is, they do not dissociate in the

lower atmosphere (troposphere). As a result, the

CFCs slowly migrate to the stratosphere where they

are affected by higher levels of radiation, releasing

the chlorine, which once free, repeatedly bonds

with ozone molecules to cause the separation of

the oxygen atoms from the molecule in question.

With the destruction of the ozone, higher levels of

radiation tend to penetrate the Earth's surface.

Moreover, as CFCs in the atmosphere have a

long life and as a chlorine atom can repeatedly

destroy thousands of ozone molecules, it will

take many decades for the ozone layer to return

to its original concentration levels, even after

the CFCs have been completely eliminated.

From the time when the theory of the destruction

of the ozone layer was published for the first time,

scientific research has demonstrated general

concern with the increase of chlorine concentration

in the stratosphere, which, after destroying the

ozone, results in health and environmental hazards,

for instance:

• Increase in the number of skin cancer patients;

• Increase in the number of cataract patients

(ocular);

• Crop damage;

• Damage to aquatic organisms (marine algae);

• Increase in environmental temperature.

VII

1 2 ... 68 69 70 71 72 73 74 75 76 77 78 79 80

Sem comentários

R and V Works FF6 Informações Técnicas Página 73