9.1 & 9.2 - Ozone Depletion Overview

Stratospheric Ozone

Protective layer in the stratosphere

Good Ozone

Ozone in the stratosphere protecting from UV-C

Bad Ozone

Ground-level pollutant from sunlight reacting with SO2 and NOx

Ozone Formation

Formation of O3 from O2 and UV radiation

CFCs

Chlorofluorocarbons found in refrigerants, propellants, etc.

CFCs Breakdown

Cl in CFCs acts as a catalyst, breaking down ozone molecules

Ozone Hole

Serious thinning of the ozone layer over Antarctica

Ozone Loss Cycle

Greatest in S. Hemisphere's winter due to ice crystal formation

Ozone Recovery Cycle

Greatest in S. Hemisphere's summer when ice crystals melt

Montreal Protocol

International agreement limiting/banning CFCs in 197 countries

HFCs

Hydrofluorocarbons, potent greenhouse gases replacing CFCs

HFCs Impact

HFCs are potent greenhouse gases needing substitutes