At the end of 20, 258 projects have been committed for an. Vivert1448 priyanka n jeevan 1446 1453 rekha 1445 shabnam 1447. With less ozone in the atmosphere, more ultraviolet radiation strikes earth, causing more skin cancer, eye damage, and possible harm to crops. Ozone layer depletion ozone depletion is the seasonal loss of a large swath of our stratospheric ozone above antartica, as well as the general degradation of this protective layer around the globe.
Ozone layer depletion cause, effects, and solutions. Global warming and ozone layer depletion are two different problems see the sidebar misconceptions about global atmospheric change on page 95. There is a burgeoning need to reduce the production of industrial products causing ozone depletion and global warming. Organization global ozone research and monitoring project report no. Depletion to ozone layer depletion does not affect a region or a country. As the result of this reaction, they form chlorine and bromine. The latter phenomenon is referred to as the ozone hole. Ozone layer depletion is one of the most serious problems faced by our planet earth. Ozone is harmful at ground level but high up the atmosphere ozone layer plays a vital role in the protection of all living beings. Pdf causes of ozone layer depletion and its effects on.
Progress report 2003 united nations environment programme, environmental e. Case study depletion of ozone in the atmosphere the work of g. Ozone depletion biology science fair project ideas. Ozone layer depletion essay sample new york essays. It is also one of the prime reasons which are leading to global warming. It was first identified in 1970s due to the advent of supersonic aircraft, which fly in the lower stratosphere and emit nitrogen oxides.
If you would like to discuss your ideas or need help troubleshooting, use the ask an expert forum. Project report on ozone depletion environmental pollution. Project report on greenhouse effect environmental pollution. The earths ozone layer is mainly found in the lower portion of the stratosphere from approximately 20 to 30. There had been a lot of research on this topic over these years to find out all the possible causes. Rivm report 481505011 technical report on stratospheric ozone. Ozone is formed by photochemical reaction, followed by three body reaction. Global warming is caused by the greenhouse effect, which is essential to life as we know it on planet earth. The thinning is most pronounced in the polar regions, especially over antarctica. A close look at the evolution at the life on earth reveals that initially the. Frequently asked questions about the ozone layer ozone. Presentation1 evs ozone depletion atmosphere of earth. Newly detected ozonedepleting substances in the atmosphere pdf.
Nearly 500 organizations, teams, and individuals from 40 countries have received stratospheric ozone protection awards for their exceptional leadership, personal dedication, and technical achievements. Within the stratosphere, the ozone layer is the portion that contains the highest. Ozone depletion results in an increase of uvb radiation, but the shorter the wavelength, the stronger the increase within the uvb range. Testing the hypothesis of ozone depletion 3 of 3 chlorine monoxide is one of the products of ozone destruction. The evolution of ozone layer depletion, its impact on climate change, health and. Causes of ozone layer depletion and its effects on human. Ozone depleting substances are the substances such as chlorofluorocarbons, halons, carbon tetrachloride, hydrofluorocarbons, etc. Ozone depletion refers to the wearing out or reduction of the amount of ozone in the stratosphere. For this science project you will need to develop your own experimental procedure. Safeguarding earths protective ozone layer became a. One of the main reasons for the widespread concern about depletion of the ozone layer is the anticipated increase in the amounts of ultraviolet radiation received. There are also springtime polar tropospheric 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.
Environmental studies ozone depletion tutorialspoint. Stratospheric ozone protection awards since 1990, epa has recognized outstanding achievement in ozone layer protection. If increasing trends of odss had continued through to 2020, the wmo project that total. Ozone depletion, gradual thinning of earths ozone layer caused by the release of chemical compounds containing gaseous chlorine or bromine from industry and other human activities. Ozone layer depletion causes, effects and solutions 7. Evs global warming, ozone depletion ppt ozone depletion.
Its consequences, the causal debate, and international cooperation number 6 february 8, 1988 since the announcement of a thinning of the ozone layer over the antarctic by uk scientists in 1985, world attention has been focusing on the causes of this phenomenon. In the upper atmosphere, atmospheric gases absorbs the suns radiation, get ionized, and release molecules. The vienna convention for protection of ozone layer was adopted by 43 nations in 1985. Global emissions of ozonedepleting substances have declined by more than 98% since. 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. Ozone layer the ozone layer is basically naturally occurring gas in the region of stratosphere where ozone particles are accumulated 2. Ozone is a colourless gas which is found in the stratosphere of our upper atmosphere. One example of ozone depletion is the annual ozone hole over antarctica that has occurred during the antarctic spring since the early 1980s. Ozone layer is also naturally broken down but there is a balance between its formation and natural depletion. When highenergy ultraviolet rays uvc strike an oxygen.
Concentrations of ozonedepleting substances are expected to decline over the coming century. Thus they add a lot to the depletion of ozone layer. B dobson and other scientists in measuring concentrations of chloride and ozone in the atmosphere g. Ozone depletion potential an overview sciencedirect topics.
This is not really a hole through the ozone layer, but rather a large area of the stratosphere with extremely low amounts of ozone. Indias integrated approach to protect the ozone layer. The emission of ozonedepleting gases are threatening the earths ozone layer. This proves ozone depletion is a big issue that needs attention. This layer absorbs the radiations and prohibits them from entering the outer surface of the earth. Ozone depletion consists of two related events observed since the late 1970s. Ozone depletion from the 1970s the depletion of the ozone layer started to capture the attention of the scientists, environmentalists, and the world community at large. Presentation on ozone depletion linkedin slideshare. However, the ozone layer is destroyed by manmade chemicals known as ozonedepleting substances ods. Worst part is that these ods can live in the atmosphere for a long time. Ozone depletion, gradual thinning of earths ozone layer caused by the release of chemical compounds containing gaseous chlorine or bromine from industry. Following is the list of some of the main ozone depleting substances and the sources from where they are released. There are natural processes that create and destroy ozone in the stratosphere.
The sun propagates ultraviolet radiations which as an adverse effect on living beings. Most ozone is found in the stratosphere upper part of the atmosphere, more than 10 to 16 kms from the surface of the earth. To the point where a seasonal hole in the ozone layer began to appear above the antarctic. This layer blocks absorbs ultraviolet part of the solar radiation which causes skin cancer from reaching the earths surface. In fact whole world is vulnerable to its after affects. 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. The layer of ozone gas is what which protects us from the harmful ultraviolet radiations of the sun. Since there is no other known source of chlorine monoxide, finding this chemical in the upper atmosphere would strongly support the idea that chlorine is destroying ozone. B dobson inferred correctly that the cause of the warm stratosphere was heating by the absorption of ultraviolet solar radiation by ozone, and he set out to. Organization global ozone research and monitoring projectreport no. Our experts wont do the work for you, but they will make suggestions and offer guidance if you come to them with specific questions. Within the stratosphere, the ozone layer is the portion that contains the highest proportion of. Causes, effects and solutions of ozone layer depletion. 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.
Belt of ozone gas 15 to 50 kilometers above the earths surface where ozone is present in concentrations of a fewparts per million. Protecting the ozone layer department of the environment. This project was carried out in the framework of the dutch national research. Ozone depleting substances are those substances which deplete the ozone layer. The main cause of ozone depletion and the ozone hole is manufactured chemicals. Use the information in the summary tab as a starting place. The natural distribution of ozone around the earth is.
Depletion of stratospheric ozone o3, as commonly known as the hole in the ozone layer, is an issue of international concern. It addressed the im portance of conservation of ozone layer and established. Evs project computer science application science icse. Solution on ozone layer depletion september 16 was voted the world ozone day in the year 1994 by the united nations general assembly. In lower atmosphere, atmospheric oxygen get dissociated and subsequently combines with molecular oxygen of the. The third body m absorbs the excess energy liberated by the above reaction and there by stabilise the o 3 ozone molecule. As a result the total amount of ozone remains constant. Hence, we should be aware and actions must be taken to ensure that ozone layer is not destroyed. These two are the major chemicals which disrupt the ozone layer. The concern is because of the fact that the ozone layer plays a protective role, screening the earth from harmful ultraviolet radiations. The increase in the levels of uv rays lead to high rate of skin cancer and eye related problems.