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OZONE
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What is ozone?
- and why do we need it?
• Ozone molecules contain 3 oxygen atoms
• It's present naturally in the atmosphere
• It protects us from dangerous radiation from the sun
• The ozone layer is essential for life on earth
• Without an ozone layer there would also be several
negative effects on our health
WHY DID THE OZONE LAYER START TO
DISAPPEAR?
• Before the Montreal protocol came in effect we used
a lot of CFC
CFC was used to many different things
It's the chlorine in CFC that reacts with ozone cousing
it to break down
The ozone layer breaks down every year even without
the help of man
DU IN NORRKÖPING, SWEDEN
1990
1995
2000
2005
2011
500
400
300
200
100
0
Jan
Feb
Mar
Apr
May
June
July
Aug
Sep
Oct
Nov
Dec
THE MONTREAL PROTOCOL
• DU is short for dobson
unit
• Dobson unit measures
density of a gas
• 300 DU is a 3mm layer
of ozone
• The ozone level is expected to rise first in 2015 due to
the Montreal Protocol
• The protocol entered into force on January 1, 1989
• It's purpose was to limit the use of substances that
harms the ozone levels
HOW DO WE MEASURE OZONE?
• G.M.B. Dobson introduced the world to the ozone
spectrophotometer in 1924
That's why the unit for is called DU, or Dobson
Units
It provided a way of measuring ozone
It compares the intesity of UV-radiation in different
wavelengths
THE WEATHERS EFFECT ON
OZONE
• Ozone is created by UV-radiation splitting oxygen
molecules
• The oxygen atom reacts with a oxygen molecule and
ozone is created
• For the most part this process takes place in the
stratosphere
• The angle of the incoming UV-radiation is important
ENVIRONMENTAL EFFECTS OF A
LOWERED OZONE LEVEL
• Every year a big ozone
hole appears over
Antarctica
Due to the hole the
temperature rises causing
more ice to melt
• The melting ice raises the
sealevel
• A raised sealevel can
lead to several countries
just in Europe being
under the new sealevel
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