Ozone depletion research papers

In56 countries agreed under what became known as the Montreal Protocol to cut CFC production and use in half.

what is ozone layer depletion and its effects?

A team of chemists at Frigidaire led by Thomas Midgely Jr. Sherwood Rowland and Mario J. Ozone is a colorless gas, a form of oxygen. Lone oxygen atoms are markedly reactive. Global pollution growth has led to increasing pressure on worldwide natural resources including air, water, land, and raw materials; and modern societies have generated an increasing demand for the use of industrial chemicals Their chemistry was difficult to replicate in the laboratory.

Each chlorine atom would react immediately with an ozone molecule, setting off a chain reaction that would destroy thousands of ozone molecules. When the scientists reported their findings inCFCs were widely used as refrigerant gases and as propellants in aerosol sprays.

Although the ozone layer is surprisingly thin, it acts as a protective shield to the earth, as it filters out most of the harmful solar ultraviolet radiation in particular UV-B that would otherwise reach our planets surface InCrutzen first showed that nitrogen oxides produced by decaying nitrous oxide from soil-borne microbes react catalytically with ozone hastening its depletion.

A significant number of chemical species were clearly involved in the interaction of CFCs and ozone in the stratosphere.

Ozone layer depletion ppt free download

But in the stratosphere, the region of the atmosphere from 6 to 31 miles, ozone absorbs potentially damaging ultraviolet UV radiation. Ozone is a highly irritant gas, which is formed in our atmosphere in the presence of sunlight from other air pollutants, including nitrogen oxides and hydrocarbons A significant number of chemical species were clearly involved in the interaction of CFCs and ozone in the stratosphere. Although the ozone layer is surprisingly thin, it acts as a protective shield to the earth, as it filters out most of the harmful solar ultraviolet radiation in particular UV-B that would otherwise reach our planets surface In , Joseph C. In , Crutzen first showed that nitrogen oxides produced by decaying nitrous oxide from soil-borne microbes react catalytically with ozone hastening its depletion. The research of Rowland and Molina brought worldwide attention to the impact of human-contributed pollution on a planetary scale. Sherwood Rowland and Mario J. Much of the increase in these gases can be considered a natural occurrence, however, at least some of it is human induced Their work was among the first to directly effect a global shift in policy, preceding the current debate on climate change. In the stratosphere, a region high up in the upper atmosphere, light rays are responsible for the breaking down of oxygen O2 , breathable oxygen into its two separate oxygen atoms. The next result of these natural processes is the so-called ozone layer in the stratosphere at altitudes between 15 and 50 kilometers in which the concentration of the ozone is raised. Widespread use of CFCs In the s, refrigeration and air conditioning systems used compounds such as ammonia, chloromethane, propane and sulfur dioxide as refrigerants.

Most are highly reactive and present in only trace amounts. Though effective, the compounds were toxic and flammable, and exposure to them could result in serious injury or death. The team focused their effort on compounds containing carbon and halogens such as fluorine and chlorine.

causes of ozone layer depletion pdf
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Ozone layer depletion Research Papers