Ozone Depletion

1. OZONE DEPLETION
Avinash Darsimbe
Asst. Professor
Department of Botany
Shri Shivaji Science College, Amravati (MS), India

2. Contents :
 Introduction
 Earth At Glance
Hole In Ozone
Scientific Studies
 Ozone Formation
Ozone Depletion
Consequences
Montreal Protocol
What Can We Do

3. Introduction –
The ozone layer or ozone shield is a region of Earth's stratosphere that
absorbs most of the Sun's ultraviolet (UV) radiation. It contains high
concentrations of ozone (O3) in relation to other parts of the atmosphere,
although still small in relation to other gases in the stratosphere.

5. The ozone layer is mainly found in the lower portion of the stratosphere from approximately
20 to 30 kilometres (12 to 19 mi) above earth, though the thickness varies seasonally and
geographically.

6. First Pictures of Earth From 100 Miles in Space, March 7 , 1947 by German V-2 rocket
Launched by NASA

7. A picture of Earth , May 18, 1969 – by Apollo 10 spacecraft
during its trans-lunar journey toward the moon

8. Green Earth

9. Factors strat to affect the Earths environment
Ozone depletion

10. Ozone Layer Formation
Chapman cycle

13. Factors affecting ozone formation

14. Gasses of family - Nitrogen oxides
Hydrogen oxides

15. .
Gasses having,Bromine & Chlorine
Mainly CFC (Chloroflorocarbon)

20. Meanwhile, TOMSt(Total Ozone
Measuring Satellite) had been launched
to observe ozone from above the Earth.

21. TOMS detected the developing ozone hole

22. TOMS detected the developing ozone hole

24. Declining OZONE CONCENTRATIONS
(in Dobson units)
(over Antarctica)
1957-1986
Early data from ground measurements of
British survey team

25. Consequences

27. Montreal protocol

28. Montreal Protocol
• 191 Nations - 1987- Montreal, Canada
• 1st plan - reduce CFC production 50% by
2000
Montreal Protocol Phase Outs -
1. CFC’s
2. Halons
3. Carbon tetrachloride
4. Methyl Chloroform
5. Methyl Bromide
6. HCFC’s