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등록일 2004.05.12 파워포인트파일MS 파워포인트 (ppt) | 99페이지 | 무료

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목차

Ozone Distribution in the Atmosphere
Why Protect the Ozone Layer?
Scientific Background
CFCs: Ozone Depleting Substances
Ozone Depleting Substances
Ozone Depletion Potential
........

본문내용

Why Protect the Ozone Layer?
Ozone Depletion leads to excessive UV-B radiation.
Excessive UV-B radiation leads to:
More skin cancers and eye cataracts.
Less productivity of plants.
Loss of immunity to diseases.
Adverse effects on plastics.

Scientific Background
1839: Ozone discovered by C. F. Sch?bein when observing electrical discharges.
1850s: Ozone shown to be a natural atmospheric constituent.
1880: Experiments show that Ozone strongly absorbs Solar Ultraviolet (UV) radiation.
1913: Proof that most of the atmosphere's ozone is located in the stratosphere.
1920: G. M. B. Dobson (an Oxford Scientist) perfected an instrument to monitor quantitatively total atmospheric ozone.

CFCs: Ozone Depleting Substances
1928: CFCs invented;

1950-70s: Consumption and use of CFCs rises rapidly during the 50s-70s period. Used in Aerosols, Refrigeration, Air Conditioning and Manufacturing of Foams.
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