Ozone: Formation, Depletion and Montreal Protocol YouTube Lecture Handouts

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Ozone: Formation, Depletion and Montreal Protocol

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Ozone-Oxygen Cycle

Oxygen-ozone cycle in presence of sunlight

Oxygen-Ozone Cycle

Oxygen-ozone cycle in presence of sunlight

Ozone

  • 15-30 km

  • UV-C: Short 𝜆, Most Damaging, Totally filtered by atm.

  • UV-B: Medium 𝜆, Biologically Active, Tanning

  • UV-A: Long 𝜆, 95% of UV, Penetrate deeper layers, ageing and wrinkling, skin cancers

  • Ozone layer: By French physicists Charles Fabry and Henri Buisson in 1913

  • Ozone hole: Antarctica every spring (discovered by Joseph Farman, Brian Gardiner, & Jonathan Shanklin of British Antarctic Survey in 1985).

Ozone Destruction

Image of Ozone Destruction

Image of Ozone Destruction

Image of Ozone Destruction

Image of The Sun And Stratosphere

Image of the Sun and Stratosphere

Image of The Sun And Stratosphere

Image of Stratospheric Halogen Gases

Image of Stratospheric Halogen Gases

Image of Stratospheric Halogen Gases

Montreal Protocol

  • Vienna Convention for Protection of Ozone Layer (1985): Protect health

  • Montreal Protocol on Substances That Deplete the Ozone Layer: Signed in 1987 & effective 1989.

    Image of Montreal Protocol Milestones

    Image of Montreal Protocol Milestones

    Image of Montreal Protocol Milestones

5 Amendments

  • London Amendment (1990) – 185 nations

  • Copenhagen Amendment (1992) – 176

  • Vienna Amendment (1995) -

  • Montreal Amendment (1997) - 152

  • Beijing Amendment (1999) -124 nations