Ozone layer depletion causes and consequences

Ozone layer depletion causes and consequences

1. Ozone Layer Depletion

2. Introduction to Ozone Layer

3. Structure of the Ozone Layer A cross-sectional diagram of Earth's atmosphere showing different layers: Troposphere, Stratosphere (including the Ozone Layer), Mesosphere, and Thermosphere. Highlight the Ozone Layer between 15-35 km.

4. Discovery of Ozone

5. Ozone Measurement

6. Interaction Between UV Radiation and the Ozone Layer

7. Ozone Depletion : The thinning of the ozone layer due to human-made chemicals, allowing more UV radiation to reach the Earth's surface. Causes : Mainly caused by chlorofluorocarbons (CFCs), halons, and other ozone-depleting substances (ODS). What is Ozone Layer Depletion?

8. Ozone Layer Depletion

9. Mechanism of Ozone Depletion CFCs released from aerosols, refrigerators, etc. CFC molecules break down under UV light , releasing chlorine atoms (Cl). Chlorine atoms react with ozone (O₃) , breaking it down into oxygen molecules (O₂) and reducing ozone concentration.

10. CFCs (Chlorofluorocarbons) : Used in refrigeration, air conditioning, and aerosols. Halons : Found in fire extinguishers. Methyl Chloroform and Carbon Tetrachloride : Used in industrial solvents. Key Reaction : Cl + O₃ → ClO + O₂ ClO + O → Cl + O₂ Chemicals Causing Ozone Depletion

11. Effects of Ozone Depletion

12. The Antarctic Ozone Hole

13. Global Response to Ozone Depletion

14. Ozone Layer Recovery Current Status : Gradual recovery of the ozone layer since the implementation of the Montreal Protocol. Expected Full Recovery : Mid-century (2040-2060) if current regulations are maintained.

15. What Can We Do?