Botkin and Keller Environmental Science 5e Chapter 25 Ozone Depletion.
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Transcript of Botkin and Keller Environmental Science 5e Chapter 25 Ozone Depletion.
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Botkin and KellerEnvironmental Science 5e
Chapter 25
Ozone Depletion
![Page 2: Botkin and Keller Environmental Science 5e Chapter 25 Ozone Depletion.](https://reader036.fdocuments.us/reader036/viewer/2022062407/56649d045503460f949d777d/html5/thumbnails/2.jpg)
Botkin and KellerEnvironmental Science 5e
Ozone• A form of oxygen in which three atoms of
oxygen occur together.• Chemically active and has a short average
lifetime in the atmosphere• Forms a natural layer high in the
atmosphere that protects us from harmful ultraviolet radiation from the sun
• A pollutant when present in the lower atmosphere
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Botkin and KellerEnvironmental Science 5e
![Page 4: Botkin and Keller Environmental Science 5e Chapter 25 Ozone Depletion.](https://reader036.fdocuments.us/reader036/viewer/2022062407/56649d045503460f949d777d/html5/thumbnails/4.jpg)
Botkin and KellerEnvironmental Science 5e
Ultraviolet Radiation and Ozone• Ozone Shield: Stratospheric ozone layer that
absorbs ultraviolet radiation
Ultraviolet A:– Longest length, least energetic – Can cause some damage to living cells– Transmitted to earth
Ultraviolet B:– Intermediate wavelength– Cause of Ozone Problem
Ultraviolet C:– Shortest wavelength/ Most energetic
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Botkin and KellerEnvironmental Science 5e
![Page 6: Botkin and Keller Environmental Science 5e Chapter 25 Ozone Depletion.](https://reader036.fdocuments.us/reader036/viewer/2022062407/56649d045503460f949d777d/html5/thumbnails/6.jpg)
Botkin and KellerEnvironmental Science 5e
Measurement of Stratospheric Ozone
• Dobson Unit– Commonly used to measure the concentration
of ozone
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Botkin and KellerEnvironmental Science 5e
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Botkin and KellerEnvironmental Science 5e
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Botkin and KellerEnvironmental Science 5e
Ozone Depletion and CFCs
• Ozone depleted due to emission of CFCs
• CFCs are stable and have a long residence time in the atmosphere
• In stratosphere, release chlorine and enter into catalytic chain reaction- depletes ozone
• More UV radiation reaches lower atmosphere
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Botkin and KellerEnvironmental Science 5e
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Botkin and KellerEnvironmental Science 5e
![Page 12: Botkin and Keller Environmental Science 5e Chapter 25 Ozone Depletion.](https://reader036.fdocuments.us/reader036/viewer/2022062407/56649d045503460f949d777d/html5/thumbnails/12.jpg)
Botkin and KellerEnvironmental Science 5e
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Botkin and KellerEnvironmental Science 5e
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Botkin and KellerEnvironmental Science 5e
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Botkin and KellerEnvironmental Science 5e
Polar Stratospheric Clouds
• Clouds that form in the stratosphere during the polar winter
• Polar Vortex– Artic air masses that in the winter become isolated from
the rest of the atmosphere and circulate about the pole
– Rotates counterclockwise because of the rotation of the earth in the Southern Hemisphere
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Botkin and KellerEnvironmental Science 5e
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Botkin and KellerEnvironmental Science 5e
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Botkin and KellerEnvironmental Science 5e
Management Issues
• Key issue is whether ozone depletion is natural or human-induced
• Montreal Protocol
• Collection and Reuse of CFCs
• Substitutes for CFCs– HFCs and HCFCs
• Short-Term Adaptation to Ozone Depletion