Behavioral Disorder: Schizophrenia & it's Case Study.pdf
Ozone Layer Depletion
1.
2.
3.
4.
5. • Ozone layer is a thin, fragile shield that
contains relatively high concentrations of
ozone.
• It shields the entire Earth from much
of the harmful UV radiation that comes
from the sun
6.
7. • The ozone layer refers to a region of
Earth's stratosphere that absorbs
most of the Sun's UV Radiation.
• It contains high concentrations of
Ozone(O3) relative to other parts of
the atmosphere.
• The ozone layer is mainly found in
the lower portion of the
Stratosphere.
• The ozone layer was discovered in
1913 by the French physicists Charles
Fabry & Henri Buisson.
8. The sun emits energy over a broad spectrum of
wavelengths:
Visible light that you see
Infrared radiation that you feel as heat
Ultraviolet (UV) radiation that you can’t see or
feel.
UV radiation has a shorter wavelength and higher
energy than visible light.
9.
10. Ozone depletion describes two
phenomena : a steady decline of
about 4% per decade in the total
volume of in 's
,the .
destruction of ozone is
by atomic . The main
source of these halogen atoms is
refrigerants, solvents,
propellants, and foam-blowing
agents ( ).
CFCs and other contributory
substances are referred to as
ozone-depleting substances
(ODS).
15. CFCS AND OTHER RELATED
COMPOUNDS
Chlorofluorocarbons (CFCs) and other
halogenated ozone depleting
substances (ODS) are mainly
responsible for man-made chemical
ozone depletion. The total amount of
effective halogens (chlorine and
bromine) in the stratosphere can be
calculated and are known as the
equivalent effective stratospheric
chlorine(EESC)
19. Since the 1970’s the ozone hole has been
increasing in size over the Antarctic.
For the first time, in September of 2000, the ozone
hole became so large it actually left populated
areas of southern Chile fully exposed to the
effects of the Sun’s UV rays.
21. The effect of ozone depletion is
the increased UV-B radiation
reaching Earth’s surface.
Effects on Humans:
•Sunburn
•Sun-damaged skin
•Cataracts
•Snow blindness
•Skin cancer
23. • As ozone levels in the stratosphere are
depleted, more solar radiation penetrates the
Earth’s atmosphere.
• This affect results in an increase in solar
radiation reaching the Earth’s surface adding
to an increase in surface temperature.
• In turn, global warming actually results in a
warming of the troposphere, but a cooling of
the stratosphere, hindering the ozone layer’s
natural chemistry for repairs.
26. After the discovery of ozone depletion in the late 1970’s,
many countries agreed that something must be done
worldwide to stop the production of man-made, ozone
harmful products.
The international community adopted the Vienna
Convention in 1985 followed by the Montreal Protocol in 1987.
The latest reports confirm that it has led to the phasing out of
about 95% of the consumption of ozone-depleting
substances (ODS) listed in the agreement. In turn, this has led
to the prospect of the ozone layer recovering by 2050 to
2075.
Furthermore, the phasing out of ozone-depleting substances
has helped to fight climate change since many of these
chemicals are also powerful greenhouse gases. According to
a recent study, the phasing out of substances under the
Protocol led to more reductions in greenhouse gases than
what is foreseen under the Kyoto Protocol.
So what are we doing about it?