The Atmosphere and Environment

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by ChemProjects
Last updated 6 years ago

Discipline:
Science
Subject:
Earth Sciences

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The Atmosphere and Environment

CFCsCFCs are compounds containing elements carbon, fluorine and chlorine. CFCs is a chemical compounds developed back in the 1930's as safe, non-toxic and non-flammable for purposes of refrigeration and spray can propellants. One of the elements that make up CFCs is chlorine. Thus, CFCs would introduce chlorine to the ozone layer. The ultraviolet radiation at this altitude at the stratosphere would breaks down CFCs, freeing the chlorine. Under the proper conditions, this chlorine has the potential to destroy large amounts of ozone. This is because the chlorine atoms would ozone molecules in the stratosphere to form chlorine oxide and oxygen. Thus, Thus, this causes the ozone layer to break down, resulting in harmful effects.

Glogster-The Atmosphere and Environment:Ozone Depletion (Montreal Protocol)

1) ..Chang Jian Xiang..............................2) ..Huang Xin Yan.................................3) ..Darshan Tana Rajan.........................4) ..Choy Jia Jun.....................................

Ozone Layer

Harmful effects

UV-B radiation can be harmful to the skin and is the main cause of sunburn; excessive exposure can also cause cataracts, immune system depression, and genetic damage, resulting in problems such as skin cancer. The ozone layer is very effective at screening out UV-B

Prevention

Montreal Protocol is an international treaty designed to protect the ozone layer by phasing out the production of numerous substances that are responsible for ozone depletion. If the international agreement is adhered to, the ozone layer is expected to recover by 2050.

Examples

1) One example of severe ozone depletion is over the Antarctic region.It has been occurring since 1979 and a general downturn in global ozone levels has been observed since the early 1980's. The ozone hole over the Antarctic reached record proportions in the spring of 2000 at 28.3 million square kilometres and vertical profiles from stations near the South pole showed complete ozone destruction in the lower stratosphere. Ozone decreases of as much as 70% have been observed on a few days.

The ozone layer refers to a region of Earth's stratosphere that absorbs most of the Sun's UV radiation. It contains high concentrations of ozone.

Examples

The Chernobyl disaster was a catastrophic nuclear accident that occurred on 26 April 1986 at the Chernobyl Nuclear Power Plant in Ukraine. An explosion and fire released large quantities of radioactive particles into the atmosphere, which spread over much of the western USSR and Europe. The battle to contain the contamination and avert a greater catastrophe ultimately involved over 500,000 workers and cost an estimated 18 billion rubles.[3] During the accident itself 31 people died, and long-term effects such as cancers and deformities are still being accounted for.


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