The Ozone Layer Is A Layer in Earth
The Ozone Layer Is A Layer in Earth
The Ozone Layer Is A Layer in Earth
LAW PROJECT:
OZONE LAYER
DEPLETION
MADE BY PRITHVI YADAV
COURSE: B.A., L.L.B (H)
ENROLLEMENT NO: A1911115068
INTRODUCTIO
N
OZONE
LAYER
ozone
layer is
The
a layer in Earth's
atmosphere which contains relatively high
concentrations of ozone (O3). This layer
absorbs 93-99% of the sun's high
frequency ultraviolet light, which is
potentially damaging to life on earth. Over
91% of the ozone in Earth's atmosphere is
present here. It is mainly located in the
lower portion of the stratosphere from
approximately 10 km to 50 km above
Earth, though the thickness varies
seasonally and geographically. The ozone
layer was discovered in 1913 by the
French physicists Charles Fabray and
CREATION OF OZONE
LAYER
The ozone layer came into existence over
3000 million years ago starting with single
cell organism
Development which requires an oxygenfree environment. As the primitive forms
of plant life multiplied and evolved, they
began to release minute amounts of
oxygen
through
the
photosynthesis
USES / IMPORTANCE OF
THE OZONE LAYER
The sun radiates large variety of
radiations including ultraviolet
OZONE DEPLETION
Ozone depletion
describes two distinct
but related phenomena
observed since the late
1970s: a steady decline
of about 4% in the total
volume of ozone in
Earth's stratosphere
(the ozone layer), and a
much larger springtime decrease in
stratospheric ozone around Earth's polar
regions. The latter phenomenon is
referred to as the ozone hole. In
addition to these well-known
stratospheric phenomena, there are also
springtime polar tropospheric ozone
depletion events. Today, there is
widespread concern that the ozone layer
is deteriorating. And fast.
CAUSES OF OZONE
DEPLETION
Ozone is created in the stratosphere when
UV
Radiation from the Sun strikes molecules
of oxygen (O2) and causes the two oxygen
atoms to split apart. If a freed atom
bumps into another O2, it joins up,
forming ozone (O3). This process is known
as photolysis. Ozone is also naturally
broken down in the stratosphere by
sunlight and by a chemical reaction with
various compounds containing nitrogen,
hydrogen and chlorine. These chemicals
all occur naturally in the atmosphere in
very small amounts. In an unpolluted
atmosphere there is a balance between
the amount of ozone being produced and
the amount of ozone being destroyed. As
a result, the total concentration of ozone
in the stratosphere remains relatively
constant but when the balance between
the production and destruction of
stratospheric ozone is tipped in favour of
destruction. Right now chlorine and
EFFECTS OF OZONE
DEPLETION
EFFECTS ON HUMAN AND ANIMAL
HEALTH:
Increased penetration of solar UV-B
radiation
will have a major impact
on human health with potential risks of
eye diseases, skin cancer and infectious
diseases Experiments on animals show
that UV exposure decreases the immune
response to skin cancers, infectious
agents and other antigens
EFFECTS ON MATERIALS
UV radiation has an adverse effect on
synthetic polymers thus limiting their
lifetimes. Typical damages range from
discoloration to loss of mechanical
integrity.
OZONE LAYER
RECOVERY
The ozone depletion caused by humanproduced
chlorine
and
bromine
compounds is expected to gradually
disappear by about the middle of the 21st
century as these compounds are slowly
removed from the stratosphere by natural
processes.
This
environmental
achievement is due to the landmark
international agreement to control the
production and use of ozone-depleting
substances. Full compliance would be
AUSTRALIAN
CHLOROFLUOROCARBON
MANAGEMENT STRATEGY
ENVIRONMENTAL PROTECTION
(OZONE PROTECTION) POLICY2000
This WA policy aims to minimize the
discharge of ozone-depleting substances
into the environment, and has been
extended to cover use of alternative
refrigerants (where relevant)
BIBLIOGRAPHY