Ozone in the lower atmosphere contributes to global warming and climate change. Without ozone, the suns intense uv radiation would sterilize the earths surface. The depletion of ozone layer has trickle down effects in the form of global warming, which in turn leads to melting of polar ice, which will lead to rising sea levels and climatic changes around the world. Apr 18, 2019 the ozone layer helps to protect life from harmful ultraviolet radiation. Progress report 2003 united nations environment programme, environmental e. What are the causes and effects of ozone depletion. This timeline highlights the average area of the ozone hole between september 7th and october th as observed by nasa spacedbased instruments see colored bars and scale. Near the ground, ozone forming as a result of chemical reactions involving traffic pollution and sunlight may cause a number of respiratory problems, particularly for young children. Ozone depletion project gutenberg selfpublishing ebooks. This leads to their breakdown and releasing of free chlorine atoms which reacts with the ozone gas, thus leading to the depletion of the ozone layer.
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. Ozone in the stratospherea layer of the atmosphere between 15 and 50 kilometers 10 and 31 miles above usacts as a shield to protect earths surface from the suns harmful ultraviolet radiation. Less dramatic, still significant, depletion of ozone levels has been recorded around the globe. Ozone layer depletion causes, effects and solutions 7.
Although it represents only a tiny fraction of the atmosphere, ozone is crucial for life on earth. Pdf there are many situations where human activities have significant effects on the environment. Project report on ozone depletion environmental pollution. These chemicals are found in cleaning agents, aerosols, insulating foam, and refrigerants. Unlike pollution, which has many types and causes, ozone depletion has been pinned down to one major human activity. Ozone depletion is the process of destruction of the ozone layer which can cause adverse effects on the living forms by many pollutants releases out from the vehicles, industries etc. Ozone depletion describes two distinct but related phenomena observed since the late 1970s. Wmo world meteorological organization, scientific assessment of ozone depletion. Ozone depletion is primarily caused by human activities. Ozone layer depletion causes, effects and solutions. Computer models project that the influence on global. Safeguarding earths protective ozone layer became a.
Ozone in the stratospherea layer of the atmosphere between 15 and 50 kilometers 10 and. We do these things almost automatically, not really even thinking about it. Ozone layer depletion to show how ozone layer is depleted due to production of cfcs, halons and other such materials. Pdf on jan 1, 2001, md safiuddin and others published global ozone depletion. Effects of ozone depletion ozone depletion is affecting the human health and environment negatively, as it allows the penetration of uv radiations to reach the earth. Ozone is a form of oxygen in which three atoms of oxygen combine to form a single molecule of ozone. The ozone layer refers to a region of earths stratosphere that absorbs most of the suns uv radiation. It covers the entire planet and protects life on earth by absorbing harmful ultravioletb uvb radiation from the sun. Uncovering the hidden hazard of hairspray a usual morning routine might include a spritz of hairspray, a spurt of shaving cream, or a spray of deodorant. Most ozone is found in the stratosphere upper part of the atmosphere, more than 10 to 16 kms from the surface of the earth. Mar 21, 2020 ozone depletion, gradual thinning of earths ozone layer in the upper atmosphere caused by the release of chemical compounds containing gaseous chlorine or bromine from industry and other human activities. 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.
In lower atmosphere, atmospheric oxygen get dissociated and subsequently combines with molecular oxygen of the. Ozone o3 is a molecule made up of three atoms of oxygen o, and is mostly found in the stratosphere, where it protects us from the suns harmful ultraviolet uv radiation. Ozone depletion biology projects, biology science fair project ideas, biology topics for cbse school,icse biology experiments for kids and also for middle school, elementary school for class 5th grade,6th,7th,8th,9th 10th,11th, 12th grade and high school, msc and college students. This website addresses stratospheric ozone issues, including the science of ozone depletion, epas regulatory approach to protecting the ozone layer, epaapproved alternatives to ozonedepleting substances, and sun safety. Find out what caused the ozone hole, and how the 1989 montreal protocol sought to put an end to ozone depletion. The ozone depletion phenomenon the national academies press.
Ozone depletion facts and information national geographic. Ozone depletion wikimili, the best wikipedia reader. Natural cycle of ozone depletion in the stratosphere. Mar 28, 2020 ozone depletion biology projects, biology science fair project ideas, biology topics for cbse school,icse biology experiments for kids and also for middle school, elementary school for class 5th grade,6th,7th,8th,9th 10th,11th, 12th grade and high school, msc and college students. The odp values are from table 15 of the scientific assessment of ozone depletion, 2002, a report of the world meteorological associations global ozone research and monitoring project. Choosing a backup generator plus 3 legal house connection options transfer switch and more duration. With less ozone in the atmosphere, more ultraviolet radiation strikes earth, causing more skin cancer, eye damage, and possible harm to crops. If you would like to discuss your ideas or need help troubleshooting, use the ask an expert forum. Halocarbon potential contributions to ozone depletion and global warming exhibit 2 provides odps for the class i and class ii odss. Looking back over the scientific investigation of ozone depletion, we can see how the molinarowland hypothesis evolved with new data.
Evidence of ozone depletion in the stratosphere began to appear in the 1980s. Ozone depletion and climate change environment canada. Humans have introduced gases and chemicals into the atmosphere that have rapidly depleted the ozone layer in the last century. This layer absorbs the radiations and prohibits them from entering the outer surface of the earth. Ozone depletion biology science fair project ideas. This depletion makes humans more vulnerable to the uvb rays which are known to cause skin cancer as well as other genetic deformities. Download a pdf of the ozone depletion phenomenon by the national research council for free. Ozone depletion consists of two related events observed since the late 1970s. Environmental studies ozone depletion ozone is a form of oxygen in which three atoms of oxygen combine to form a single molecule of ozone. The subtropical ground ozone concentration in northern hemisphere is twice the corresponding region in southern hemisphere 5. Environmental studies ozone depletion tutorialspoint. Ozone depletion is affecting the human health and environment negatively, as it allows the penetration of uv radiations to reach the earth. These radiations can cause severe diseases in humans such as skin cancer, eye damage and genetic mutations etc 9.
In the upper atmosphere, atmospheric gases absorbs the suns radiation, get ionized, and release molecules. Causes of ozone layer depletion and its effects on human. It can be found in small concentrations in the troposphere where it is considered a pollutant. This website addresses stratospheric ozone issues, including the science of ozone depletion, epas regulatory approach to protecting the ozone layer, epaapproved alternatives to ozone depleting substances, and sun safety. Students explore the dynamic and competing upper atmospheric roles of the protective ozone layer, the suns uv radiation and harmful humanmade cfcs chlorofluorocarbons. The ozone layer was discovered in 19 by the french physicists charles fabry and henri buisson. The natural distribution of ozone around the earth is. Ozone depletion also explains much of the observed reduction in stratospheric and upper tropospheric temperatures. Aerosols are common, convenient, and harmless, right.
The main effect of ozone depletion is an increase in uvb rays reaching the earths surface causes. How severe is the depletion of the antarctic ozone layer. Let us see a few possible effects of the ozone layer depletion on the earths environment and also on the plants and animals. Find answers to frequently asked questions about the ozone layer, ozone depletion, and the effects of ozone depletion on health and the environment. This allotropic form of oxygen is formed by passing dry oxygen through a salient electric current. Putting additional ozone destroying compounds such as cfcs into the atmosphere is like increasing the size of the holes in our bucket of ozone. When chlorine nitrate, a chemical that ties up chlorine in an ozonesafe form, was added to the hypothesis, the expected amount of ozone loss decreased. Ozone is harmful at ground level but high up the atmosphere ozone layer plays a vital role in the protection of all living beings. By doing so a part of the oxygen molecules undergo dissociation and then atomic oxygen gets associated with the oxygen molecule to give 5%10% of the allotropic form of oxygen. For this science project you will need to develop your own experimental procedure.
The buildup of oxygen in the atmosphere led to the formation of the ozone layer in the upper atmosphere or stratosphere. Let us have a detailed look at the various causes and effects of ozone layer depletion. Ozone layer depletion cause, effects, and solutions. The ozone layer helps to protect life from harmful ultraviolet radiation. To the point where a seasonal hole in the ozone layer began to appear above the antarctic. Frequently asked questions about the ozone layer ozone. But through domestic and international action, the ozone layer is healing and should fully recover by about 2065. It contains high concentrations of ozone o3 relative to other parts of the atmosphere. National aeronautics and the ozone hole space administratio n. The latter phenomenon is referred to as the ozone hole. Ozone depletion is largely a result of manmade substances.
Within the stratosphere, the ozone layer is the portion that contains the highest. Putting additional ozonedestroying compounds such as cfcs into the atmosphere is like increasing the size of. Using gumdrops and toothpicks, students conduct a largegroup, interactive ozone depletion model. Global ozone research and monitoring projectreport no. Ozone is ozone is a form of oxygen with 3 oxygen atoms o3. Ozone depletion, gradual thinning of earths ozone layer in the upper atmosphere caused by the release of chemical compounds containing gaseous chlorine or bromine from industry and other human activities. Normal ozone ozone layer depletion and its effects. But ozone depletion and climate change are linked in many other ways as well,particularly through. Ozone layer depletion is simply the wearing out reduction of the amount of ozone in the stratosphere. Methyl bromide is the single largest contributor of stratospheric br and an important contributor to stratospheric ozone depletion. Rivm report 481505011 technical report on stratospheric ozone. Ozone is highly corrosive and toxic and is used as a disinfectant. Les diablerets, switzerland by jeanpierre pommereau, june 2010.
Soils have recently been identified as a significant sink of. The ozone layer is mainly found in the lower portion of the stratosphere. At the end of 20, 258 projects have been committed for an. Update on ozonedepleting substances odss and other gases of. Ground ozone concentration is lower in polar and equatorial regions. The thinning is most pronounced in the polar regions, especially over antarctica. Pdf depletion of the ozone layer and its consequences. Ozone layer depletion is one of the major environmental issues which is getting thinner day by day as a result of increasing pollution.
By 2012, the gef had helped 18 economies in transition to phase out ozone depleting substances under the montreal protocol. Ozone layer depletion is one of the major environmental issues which is getting thinner day by day as a. The term ozone depletion means more than just the natural destruction of ozone, it means that ozone loss is exceeding ozone creation. Depletion of stratospheric ozone o3, as commonly known as the hole in the ozone layer, is an issue of international concern. Pdf there are many situations where human activities have significant effects on. An official website of the united states government. Our experts wont do the work for you, but they will make suggestions and offer guidance if you come to them with specific questions. Use the information in the summary tab as a starting place. By 2012, the gef had helped 18 economies in transition to phase out ozonedepleting substances under the montreal protocol.
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