the ozone shield section 13.2 objectives: 1. explain how the ozone layer shields the earth from much...

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The Ozone Shield The Ozone Shield Section 13.2 Section 13.2 Objectives: Objectives: 1. 1. Explain how the ozone layer Explain how the ozone layer shields the Earth from much shields the Earth from much of the sun’s harmful of the sun’s harmful radiation. radiation. 2. 2. Describe the damaging Describe the damaging effects of ultraviolet effects of ultraviolet radiation. radiation. 3. 3. Explain why the threat to Explain why the threat to the ozone layer is still the ozone layer is still

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Page 1: The Ozone Shield Section 13.2 Objectives: 1. Explain how the ozone layer shields the Earth from much of the sun’s harmful radiation. 2. Describe the damaging

The Ozone ShieldThe Ozone ShieldSection 13.2Section 13.2

Objectives:Objectives:1.1. Explain how the ozone layer Explain how the ozone layer

shields the Earth from much shields the Earth from much of the sun’s harmful of the sun’s harmful

radiation.radiation.2.2. Describe the damaging Describe the damaging

effects of ultraviolet effects of ultraviolet radiation.radiation.

3.3. Explain why the threat to the Explain why the threat to the ozone layer is still continuing ozone layer is still continuing

today.today.

Page 2: The Ozone Shield Section 13.2 Objectives: 1. Explain how the ozone layer shields the Earth from much of the sun’s harmful radiation. 2. Describe the damaging

The Ozone LayerThe Ozone Layer::

•An area in the stratosphere where ozone is highly concentrated

•Absorbs most of the UV light from the sun

•Acts like a sunscreen for Earth’s inhabitants

Page 3: The Ozone Shield Section 13.2 Objectives: 1. Explain how the ozone layer shields the Earth from much of the sun’s harmful radiation. 2. Describe the damaging

Chlorofluorocarbons (CFC’s):

•Are nonpoisonous, nonflammable, and non-corrosive

•Were used as coolants in refrigerators and air conditioners

•Also used as propellants in spray cans

•Under ideal conditions, 1 chlorine atom can destroy 100,000 ozone molecules

Page 4: The Ozone Shield Section 13.2 Objectives: 1. Explain how the ozone layer shields the Earth from much of the sun’s harmful radiation. 2. Describe the damaging

The Ozone HoleThe Ozone Hole::

•A thinning of stratospheric ozone that occurs over the poles in the spring

Page 5: The Ozone Shield Section 13.2 Objectives: 1. Explain how the ozone layer shields the Earth from much of the sun’s harmful radiation. 2. Describe the damaging

Effects of Ozone ThinningEffects of Ozone Thinning

Page 6: The Ozone Shield Section 13.2 Objectives: 1. Explain how the ozone layer shields the Earth from much of the sun’s harmful radiation. 2. Describe the damaging

Protecting the Ozone LayerProtecting the Ozone Layer

•1987 – Montreal Protocol – nations agreed to limit production of CFC’s

•1992 – developed countries agreed to eliminate most CFC’s by 1995

•Ozone depletion continues because CFC’s remain active in the stratosphere for 60-120 years

Page 7: The Ozone Shield Section 13.2 Objectives: 1. Explain how the ozone layer shields the Earth from much of the sun’s harmful radiation. 2. Describe the damaging

Know for Test!Know for Test!

•P.338 (3-5)

Atmosphere and Climate ChangeSection 2 Objectives Explain how the ozone layer shields Earth from much of the sun’s harmful radiation. Explain how chlorofluorocarbons

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