AYY LMAO
OZONE
WOOOOOSH
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 into effect we
used a lot of chlorofluorocarbon
• CFC was used in many different things
• It's the chlorine in CFC that reacts with ozone
causing it to break down
• The ozone layer breaks down every year even
without the help of humans
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 intensity of UV-radiation in
different wavelengths
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 WEATHERS EFFECT ON
OZONE
• Ozone is created by UV-radiation splitting oxygen
molecules
• An oxygen atom reacts with an 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
SUMMARY
The decline of ozone is no longer a big issue due to
the Montreal Protocol
Even though there hasn’t been much of an increase
of ozone since the agreement, but in the long term
there will be a large increase of ozone after 2015
Meaning the problem is pretty much solved, as long
as we don’t start using an other substance that
destroys our ozone