Ozone layer is also naturally broken down but there is a balance between its formation and natural depletion. List of books and articles about ozone layer online. Ozone depletion, gradual thinning of earth s ozone layer in the upper atmosphere caused by the release of chemical compounds containing gaseous chlorine or bromine from industry and other human activities. The earths ozone layer is mainly found in the lower portion of the stratosphere from approximately 20 to 30. Chlorofluorocarbons cfcs are the major cause of ozone depletion. Ozone layer, region of the upper atmosphere, between roughly 15 and 35 km 9 and 22 miles above earths surface, containing relatively high concentrations of ozone molecules. Most ozone is found in the stratosphere upper part of the atmosphere, more than 10 to 16 kms from the surface of the earth. It contains high concentration of ozone o 3 in relation to other parts of the atmosphere, although still small. This happens when the chlorine and bromine atoms in the atmosphere come in contact with ozone and destroy the ozone molecules. The ozone layer is important for blocking most of the harmful radiation that comes from the sun.
The so 2f 2 global background mixing ratio increased during recent decades and had reached about 1. Policy responses to ozone depletion mario molina and sherwood rowland showed in 1974 that cfc gases destroy ozone coordinating committee on ozone layer ccol established by unep in the 1970s vienna convention for the protection of the ozone layer held in 1985 montreal protocol to ban substances that deplete the ozone layer held in 1987. Depletion to ozone layer depletion does not affect a region or a country. At the end of 20, 258 projects have been committed for an. The chlorofluorocarbon and the halons are potent ozone depletors. Ozone in the ozone layer is formed by the action of solar ultraviolet light on oxygen. As a matter of fact, if one were to take all of the ozone in the atmosphere at o o c and compress it to a pressure of 1 atmosphere, the thickness of the ozone layer over the earths surface would be 0. The thinning is most pronounced in the polar regions, especially over antarctica.
As a result the total amount of ozone remains constant. Weather conditions also influence the size of the ozone hole in the stratosphere. Unit 4 project amelia shae, olive ann parker, and peyton thompson. Approximately 90 percent of the atmospheres ozone occurs from 1018 km 611 miles to. When this breakdown of the ozone layer occurs, the earth stands more vulnerable as it. Vililia bsed ivs d ozone layer depletion causes, effects and solutions ozone layer depletion is one of the most serious problems faced by our planet earth. The ozone depletion resulted in secondary production of an ozone layer near the ground terrestrial ozone layer, which is responsible for adverse effects on plants, humans and environment with increased number of bronchial diseases in humans.
Ozone depletion results in an increase of uvb radiation, but the shorter the wavelength, the stronger the increase within the uvb range. Ozone present in the stratosphere forms a protective layer and known as ozone layer, ozonosphere or ozone umbrella its concentration in atmosphere is about 10 ppm. However, the fact that there also exists another layer strong enough to stop the former one is comforting. The world health organization was established in 1948 as a. The ozone layer helps to protect life from harmful ultraviolet radiation. The stratospheric ozone layer forms a thin shield in the upper atmosphere, protecting life on earth from. Chloroflourocarbons are major cause of ozone depletion. This is a school project on the ozone layer made by my daughter aakanksha. Measurements from satellitebased instruments show that this area of very low ozone concentration has developed over antarctica every year since about 1975. Conclusion and recommendations ozone layer is continuously depleting which is highly alarming situation of today. Search, discover and share your favorite ozone gifs. Human eye and skin are the most exposed part of the body to these. The level from which it extends outward varies with latitude.
Timeline of stratospheric ozone depletion and observations. Ozone depletion biology science fair project ideas. Ozone layer the ozone layer is basically naturally occurring gas in the region of stratosphere where ozone particles are accumulated 2. One chlorine can destroy 100,000 molecules of ozone. In lower atmosphere, atmospheric oxygen get dissociated and subsequently combines with molecular oxygen of the. If you would like to discuss your ideas or need help troubleshooting, use the ask an expert forum. It is also one of the prime reasons which are leading to global warming. Pdf causes of ozone layer depletion and its effects on.
Conversion project approved by the 41st executive committee in december. The only practical approach to stopping the destruction of the ozone layer is to reduce the amount of humancreated pollutants that contribute to its depletion. Within the stratosphere, the ozone layer is the portion that contains the highest. Layers of the atmosphere 45the suns utraviolet rays 68the ozone layer 9 3. Ozone absorbs a band of ultraviolet radiation called uvb. The roll of ozone is very crucial and significant because it acts as a protective shield in the biosphere ecosystem against their exposure to deadly and dangerous ultraviolet radiation. Causes, effects and solutions of ozone layer depletion. Ozone is a colourless gas which is found in the stratosphere of our upper atmosphere. Ozone layer depletion ozone layer depletion is the gradual thinning of the earths ozone layer in the upper atmosphere caused due tho release of chemical compounds containing gaseous bromine or chlorine from industries or other human activities. The depletion of the ozone layer has thus resulted in the birth of a fear in everybodys minds. The ozone layer prevents most ultraviolet uv and other highenergy radiation from penetrating to the earths surface but does. The layer of ozone gas is what which protects us from. Efforts to protect the ozone layer now involve many different nations and industries. Use the information in the summary tab as a starting place.
Pdf depletion of the ozone layer and its consequences. The resulting pdf file may be inserted into powerpoint, or used like any other pdf file. Nearly 90% of earths ozone is in the stratosphere and referred to as the ozone layer. The natural distribution of ozone around the earth is. Nearly 500 organizations, teams, and individuals from 40 countries have received stratospheric ozone protection awards for their exceptional leadership, personal dedication, and technical achievements. Find out what caused the ozone hole, and how the 1989 montreal protocol sought to put an end to ozone depletion. The layer of ozone gas is what which protects us from the harmful ultraviolet radiations of the sun. The causes, mechanism and bioeffects of ozone layer depletion on humans were addressed. Found in stratosphere, filters out ultra violet radiation uva and uvb essay on layers of atmosphere activity essay layers on of atmosphere activity atiyah essays on contract 1986 world this dissertation is submitted in partial fulfillment. Free chlorine in the upper atmosphere catalyzes the conversion of o3 into o2. The increase of ultraviolet light due to depletion of the ozone layer will not only.
Causes of ozone layer depletion and its effects on human. The ozone layer or ozone shield is a region of earth s stratosphere that absorbs most of the sun s ultraviolet radiation. Ozone layer depletion is the thinning of the ozone layer present in the atmosphere. Click download or read online button to get ozone depletion greenhouse gases and climate change book now. Climatologists project that the accumulation of greenhouse gases in the lower atmosphere will. Project ozone layer depletion pdf the stratospheric ozone layer forms a thin shield in the upper atmosphere, protecting life on earth from. In fact whole world is vulnerable to its after affects. This site is like a library, use search box in the widget to get. Stratospheric ozone protection awards since 1990, epa has recognized outstanding achievement in ozone layer protection. The latter phenomenon is referred to as the ozone hole. Let us have a detailed look at the various causes and effects of ozone layer depletion. You can find maps of the ozone layer and compare different regions of the globe for ozone coverage.
Project on ozone layer depletion email this blogthis. Ozone layer depletion pdf file the origin, causes, mechanisms and bio effects of ozone layer depletion as. Ozone layer depletion causes, effects and solutions 7. Concentrations of ozonedepleting chemicals continue to rise in the atmosphere. Depletion of stratospheric ozone o3, as commonly known as the hole in the ozone layer, is an issue of international concern. About depletion of the ozone layer is the anticipated increase in the amounts of. Project report on ozone depletion environmental pollution. The main reasons of this depletion are the release of organohalogen compounds like chlorofluorocarbons and bromofluorocarbons. These substances should be banned or we should use their alternatives so that in future we can protect ourselves from the harmful effects of uv radiation.
Ozone layer depletion cause, effects, and solutions. The ozone hole is an area where the amount of ozone in the upper atmosphere is much lower than normal. Ozone depletion over india with so much worry about the rapid ozone depletion taking place in various parts of the earth, indian scientists are closely monitoring the ozone layer over india for possible depletion trends. To the point where a seasonal hole in the ozone layer began to appear above the antarctic. Ozone depletion greenhouse gases and climate change. Foreword many people in europe are concerned about the impacts of climate. The problem of ozone depletion and its adverse consequences have threatened the existence of life on the planet. Ozone depletion consists of two related events observed since the late 1970s. For this science project you will need to develop your own experimental procedure. The increase in the levels of uv rays lead to high rate of skin cancer and eye related problems. Our experts wont do the work for you, but they will make suggestions and offer guidance if you come to them with specific questions. Pdf ozone o 3 is a stratospheric layer that plays important role in providing support to humans for their survival.
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