Ozone layer depletion chlorofluorocarbon ozone depletion. Sep 22, 2009 ozone layer depletion leveling off, satellite data show date. The world health organization was established in 1948 as a. 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. The ozone layer is mainly found in the lower portion of the stratosphere. Affordable and search from millions of royalty free images, photos and vectors. A warming trend and stratospheric ozone depletion have been observed in europe over the last four decades. In addition, increased surface uv leads to increased tropospheric ozone, which is a health risk to humans. Unlike oxygen o2, ozone has a strong scent and is blue in color. Without ozone, there would be global warming, in addition diseases can come up. Research has shown that the ozone is slowly being depleted.
When there was no ozone layer, life could only exist in the sea protect the ozone layer. The ozone layer depletion is a major concern and is associated with a number of factors. When cfc is released into the atmosphere, they mix with atmospheric. Unlike pollution, which has many types and causes, ozone depletion has been pinned down to one major human activity. Within the stratosphere, the ozone layer is the portion that contains the highest. Pdf causes of ozone layer depletion and its effects on. In semiconductor physics, the depletion region, also called depletion layer, depletion zone, junction region, space charge region or space charge layer, is an insulating region within a conductive, doped semiconductor material where the mobile charge carriers have been diffused away, or have been forced away by an electric field. This is found everywhere, especially in plastics and refrigerants and.
Unit 4 project amelia shae, olive ann parker, and peyton thompson. The ozone layer and its depletion linkedin slideshare. The causes, mechanism and bioeffects of ozone layer depletion on humans were addressed. Ozone depletion results in an increase of uvb radiation, but the shorter the wavelength, the stronger the increase within the uvb range. Apr 18, 2019 the ozone layer helps to protect life from harmful ultraviolet radiation. Another question that frequently arises is why an ozone layer exists. Explain how engineers are trying to help reduce ozone depletion. Why the ozone layer is vital to life on earth the ozone layer is a protective shield that blocks the suns harmful ultraviolet rays from reaching the earths surface. Indias integrated approach to protect the ozone layer introduction one of the most important environmental concerns the world faces today is of depletion of the ozone layer in the stratosphere. Some authors suggested that the reasons for it are. The ozone layer was discovered in 19 by the french physicists charles fabry and henri buisson.
Ozone layer depletion is one of the most serious problems faced by our planet earth. The process of ozone depletion pennsylvania state university. Industries that manufacture things like insulating foams, solvents, soaps, cooling things like air conditioners. Ozone depleting substances are the substances such as chlorofluorocarbons, halons, carbon tetrachloride, hydrofluorocarbons, etc. The earths ozone layer is mainly found in the lower portion of the stratosphere from approximately 20 to 30. Data shows that stratospheric concentrations of ozone depleting substances are declining. Pdf depletion of the ozone layer and its consequences. Most important, we know that if the most potent odss were to continue to be emitted and increase in the atmo sphere, the result would be more depletion of the ozone layer. Calculation of depletion layer thickness by including the mobile carriers saeed mohammadi and c. 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. Humans have introduced gases and chemicals into the atmosphere that have rapidly depleted the ozone layer in the last century. The ozone layer is a belt of naturally occurring ozone gas that sits 9. The ozone layer has been identified in term papers as important in the overall spectrum of the atmosphere.
Ozone layer the ozone layer is basically naturally occurring gas in the region of stratosphere where ozone particles are accumulated 2. Indias integrated approach to protect the ozone layer. Ozone layer research and technical resources us epa. Ozone depletion and global warming an integrated approach.
Ozone absorbs a band of ultraviolet radiation called uvb. 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. Tthe ozone hole and global he ozone hole and global global. Addressing ozone layer depletion as part of the united states commitment to implementing the montreal protocol on substances that deplete the ozone layer, congress amended the clean air act to add provisions under title vi for protecting the ozone layer ozone layer the region of the stratosphere containing the bulk of atmospheric ozone. It contains high concentrations of ozone o3 relative to other parts of the atmosphere. Jan 03, 2010 the ozone layer diminishes more each year. The depletion region acts like a wall between ptype and ntype semiconductor and prevents further flow of free electrons and holes. This zip file contains materials for middle school science lessons on the layers, composition. The main causes responsible for the depletion of the ozone layer are listed below. Saince fair project, holse in the ozone layer duration. Vivert1448 priyanka n jeevan 1446 1453 rekha 1445 shabnam 1447. As a result of international action, the ozone layer is expected to. Ozone layer is also naturally broken down but there is a balance between its formation and natural depletion. Causes of ozone layer depletion ozone depletion substances role of cf.
The troposphere extends from the surface of the earth upto 12 km and stratosphere extends upto about 50 km from the surface of the earth. Pilot demonstration project on ods waste management. Ozone layer depletion causes affecting factors ozone. In this picture we are seeing how the ozone layer is destroyed and the effects of that destruction. Ozone is a colourless gas which is found in the stratosphere of our upper atmosphere. Global ozone research and monitoring project wmo library. In your ozone layer term paper, consider how greenhouse gases contribute to the deletion of the ozone layer and promulgate global warming. A shock wave starting from a rocket or falling finished off stage can form a peculiar corridor between the troposphere and stratosphere. Appendix b natural source zone depletion nszd appendix. A free powerpoint ppt presentation displayed as a flash slide show on id. Report on kyrgyzstan nous activities devoted to the 16th. At the end of 20, 258 projects have been committed for an. Designation of amount of such depletion as an ozone hole is made when the detected amount of depletion exceeds fifty percent.
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. Our experts wont do the work for you, but they will make suggestions and offer guidance if you come to them with specific questions. Approximately 90 percent of the atmospheres ozone occurs from 1018 km 611 miles to. As the area of polar ozone depletion commonly called the ozone hole gets larger, additional ultraviolet rays are allowed to pass through. On the eve of preparation to 16th of september international day of ozone layer protection, the following activities were performed. Ozone layer depletion is one of the major environmental issues which is getting thinner day by day as a. Causes of ozone layer depletion and its effects on human. Ozone depletion is largely a result of manmade substances.
Global warming and ozone layer depletion are two different problems see the sidebar misconceptions about global atmospheric change on page 95. The recent years publications have focused on the influence of the ozone layer depletion old to the climate change cc. But through domestic and international action, the ozone layer is healing and should fully recover by about 2065. This power point presentation is mainly focused on todays most challenging issue as depletion of ozone layer with major factors affecting it. Conclusion and recommendations ozone layer is continuously depleting which is highly alarming situation of today. The ozone layer protects living things from harmful ultraviolet rays from the sun. Ozone layer depletion is simply the wearing out reduction of the amount of ozone in the stratosphere. If you would like to discuss your ideas or need help troubleshooting, use the ask an expert forum. Protecting the ozone layer and reducing global warming undp. Presentation on ozone depletion linkedin slideshare.
Twenty questions and answers about the ozone layer. When there was no ozone layer, life could only exist in. Ozone depletion facts and information national geographic. Following is the list of some of the main ozone depleting substances and the sources from where they are released. Ozone o 3 is a stratospheric layer that plays important role in providing support to humans for their survival.
May 30, 2017 by knowing the statistics about ozone layer depletion, we can keep working hard at restoring our planet so that it is available for future generations to enjoy. The european environment and health committee identified the need to assess these topics in 1997, as part of the leadup to the third ministerial conference on envi. Ozone layer depletion leveling off, satellite data show. The ozone layer is mainly found in the lower portion of the stratosphere, about 20 to 30 km 12 to 19 miles above the earth, though the thickness varies seasonally and geographically. As a result the total amount of ozone remains constant. The natural distribution of ozone around the earth is.
Mar 21, 2020 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. Global warming is caused by the greenhouse effect, which is essential to life as we know it on planet earth. The layer shields the entire earthfrom much of the harmful ultravioletradiation that comes from the sun. The no zone of ozone lesson ozone depletion, ozone layer.
What is important to keep in mind is the fact that prevention of ozone layer depletion is so very important because it directly affects the well being of the people. The ozone layer refers to a region of earths stratosphere that absorbs most of the suns uv radiation. It is also one of the prime reasons which are leading to global warming. Recently, t he depletion of its layer has been hazardous to the safety for our environment and its organisms. Poster sustainable development goals and montreal protocol on substances that deplete the ozone layer. Research into ozone depletion has therefore focused largely,though not exclusively,on trends and processes within the stratosphere,the layer of stratified, relatively stable air that houses the ozone layer and. Project ozone layer depletion pdf the stratospheric ozone layer forms a thin shield in the upper atmosphere, protecting life on earth from. View ozone layer depletion research papers on academia. These rays cause cancer, cataracts, and lowered immunity to diseases. Depletion of the stratospheric ozone layer by humanproduced ozone depleting substances has been recognized as a global environmental issue for more than three decades, and the international effort to address the issue via the united nations montreal protocol marked its 20year anniversary in 2007. Calculation of depletion layer thickness by including the. Nasa provides daily images, data, and information from satellite instruments that monitor the ozone layer and the ozone hole ozone holea thinning break in the stratospheric ozone layer. Update on ozone depleting substances odss and other gases of interest to the montreal protocol. Complete 2018 scientific assessment of ozone depletion.
It is an essential factor for many global, biological and environmental phenomena. Within the stratosphere, the ozone layer is the portion that contains the highest proportion of. What we all need to understand is the idea that we all are going to have to face the repercussions of ozone layer depletion. The questions address the nature of atmospheric ozone, the chemicals that cause ozone depletion, how global and polar ozone depletion occur, and what could lie ahead for the ozone layer. One of the main reasons for the widespread concern about depletion of the ozone layer is the anticipated increase in.
Report on kyrgyzstan nous activities devoted to the 16th of september international day of ozone layer protection. Depletion of stratospheric ozone o3, as commonly known as the hole in the ozone layer, is an issue of international concern. It is found largely in the stratosphere that extends from about 6 km at the poles and 17 km at the equator to about 50 km above the earths surface. But many researchers do not agree with these predictions,14 and express their. Chlorofluorocarbons or the cfc are the main cause of ozone layer depletion. The concern is because of the fact that the ozone layer plays a protective role, screening the earth from harmful ultraviolet radiations. The layer of ozone gas is what which protects us from the harmful ultraviolet radiations of the sun.
Addressing ozone layer depletion ozone layer protection. In response to the prospect of increasing ozone depletion. Protecting the ozone layer department of the environment. Find out what caused the ozone hole, and how the 1989 montreal protocol sought to put an end to ozone depletion. Global ozone research and monitoring projectreport no. The answers are updates of those first presented in the previous ozone assessment, scientific assessment of ozone depletion. The assessment documents the advances in scientific understanding of ozone depletion reflecting the thinking of the many international scientific experts who. Downloads scientific assessment of ozone depletion 2018. Use the information in the summary tab as a starting place. By merging more than a decade of atmospheric data from european satellites. Its layer in the stratosphere protects us from deadly ultraviolet rays. For this science project you will need to develop your own experimental procedure. Ozone layer depletion causes, effects and solutions 7. This is due to excessive amounts of chlorofluorocarbons cfc.
Depletion of the ozone layer research paper victor. Inexpensive light extremely stable, inert traditional refrigerants ammonia, sulfur dioxide, methyl chloride highly volatile caustic and toxic remove heat through vaporization of liquefied gas only adequate as refrigerants expensive heavy transport, storage. Cfcs nonflammable nontoxic trap heat good insulators. For example, when the american rocket atlas was launched, a hole the electron flux was as small. The assessment documents the advances in scientific understanding of ozone depletion reflecting the thinking of the many. Abstract about the ozone layer the disappearance of the. Trends in emissions of ozonedepleting substances, ozone. Scientific assessment of ozone depletion montreal protocol. Appendix b natural source zone depletion nszd appendix executive summary 1. Ozone layer research papers on the depletion of the the ozone. Aims of project the purpose of this study is to find alternatives to replace cfc 1,hcfc 141b and hcfc 225 that do not deplete the ozone layer and do not have large global warming potentials. Ozone depletion consists of two related events observed since the late 1970s.
Ozone layer ozone layer research papers discuss the depletion of the the ozone layer in the atmosphere. The ozone layer is an important protective shield for life on earth. World attention haa since been foreetidly focused on the problem as a result of the dramatic findings by scientists. Introduction ozone is a bluish gas located in the stratosphere which protects the earth by absorbing uvb and prevents this harmful radiation from reaching the earth. The thinning is most pronounced in the polar regions, especially over antarctica. Ozone depletion would magnify all of the effects of uv on human health, both positive including production of vitamin d and negative including sunburn, skin cancer, and cataracts. Chloroflourocarbons are major cause of ozone depletion. Most ozone is found in the stratosphere upper part of the atmosphere, more than 10 to 16 kms from the surface of the earth. Our discussion here will focus on two of the main reactions involved in the production of ozone in the atmosphere. A dynamic equilibrium is maintained between the formation and decomposition of ozone. From protecting the ozone layer to preventing global warming 1 advent of the ozone layer depletion issue chlorofluorocarbons cfcs do not exist in nature. The concern for the ozone layer around the world stems from the fact that this layer, primarily in the region 10 to 50 kilometers above the earth, screens out most of the. To the point where a seasonal hole in the ozone layer began to appear above the antarctic. Prevent global warming ministry of economy, trade and industry.
Ozone depletion biology science fair project ideas. Human eye and skin are the most exposed part of the body to these. However, the ozone layer is destroyed by manmade chemicals known as ozone depleting substances ods. The world meteorological or ganization wmo, 1995 predicted that the depletion of the ozone layer peaked around 1998 and the layer would slowly recover by 2045 12. Nearly 500 organizations, teams, and individuals from 40 countries have received stratospheric ozone protection awards for their exceptional leadership, personal dedication, and technical achievements. Ozone layer depletion cause, effects, and solutions.
Why the hole in the atmospheric ozone layer above us. The emission of ozone depleting substances has been damaging the ozone layer. Ppt ozone layer depletion powerpoint presentation free. Although this particular project focuses on locating the ozone layer, it helps to understand why the ozone layer exists where it does in the atmosphere. Stratospheric ozone protection awards since 1990, epa has recognized outstanding achievement in ozone layer protection. The chlorofluorocarbon and the halons are potent ozone depletors.
For nearly a billion years, ozonemolecules in the atmosphere haveprotected life on earth from theeffects of. Nearly 90% of earths ozone is in the stratosphere and referred to as the ozone layer. Ozone depletion stock pictures, royaltyfree photos. The ozone layer helps to protect life from harmful ultraviolet radiation.
Cause effect solution the ozone hole global warming tthe ozone hole and global he ozone hole and global wwarming 2arming 2 the ozone hole and global warming fact file if all the ozone above your head was collected in a continuous layer, it would. Certain compounds such as chlorofluorocarbons, cfcs, are released into the atmosphere by human activities, and these cfcs particularly, they are very, very unreactive at the atmospherical ground level and they go all the way up to the stratosphere and then. This depletion makes humans more vulnerable to the uvb rays which are known to cause skin cancer as well as other genetic deformities. Depletion of ozone layer essaytyper the depletion of the ozone layer. This website addresses stratospheric ozone issues, including the science of ozone depletion, epas regulatory approach to protecting the ozone layer, epa. It has been found that this protective ozone layer is getting depleted because of the presence of cfc chlorofluorocarbon compounds. Ozone layer depletion michelle mattos block 1 the issues the problem with our ozone layer, as i said before, is that it is getting very very thin. Ozone is a dangerous but vital gas for our basic survival. Safeguarding earths protective ozone layer became a. Complete 2018 scientific assessment of ozone depletion cover, contents, executive summary. Ozone is unstable and decomposes to molecular oxygen. Jan 30, 2012 the ozone layerthe ozone layer is a deep layer in thestratosphere, encircling the earth,that has large amounts of ozone in it.
The depletion region is also called as depletion zone, depletion layer, space charge region, or space charge layer. Archived from the original pdf on february 25, 2011. Ozone ozone is a simple molecule of three oxygen atoms and it is present in the two lowest layers of the atmosphere troposphere and stratosphere. Organization global ozone research and monitoring projectreport no. Selvakumar abstracta useful analytical approximation for depletion layer thick ness, which takes into account the effect of mobile carriers under high forward bias is presented. The causes of ozone depletion the impacts ozone depletion has on the environment the current status of the ozone solutions to the.
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