Quantifying contributions of chlorofluorocarbon banks to. Ozone layer depletion, its causes and its effects ozone. The layers which occupy the lower part of the atmosphere removes the unwanted pollutants from the earths surface. Depletion to ozone layer depletion does not affect a region or a country. Ozone depletion describes two distinct, but related observations. According to environmental scientists, the cfcs chlorofluorocarbons and oxides of nitrogen, when released from lower atmosphere reach the stratosphere and destroy the ozone layer. This radiation could have seriously damaging effects on germinating crops and on the photoplankton of the oceans. Ozone depletion consists of two related events observed since the late 1970s. Ozone layer the ozone layer is basically naturally occurring gas in the region of stratosphere where ozone particles are accumulated 2.
In the 1980s, scientists observed a thinning of the ozone layer over antarctica, and peo ple began thinking of it as an ozone hole. 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. Once the ozone hole was discovered in antarctica in 1985 and the evidence of actual ozone layer depletion was confirmed, it became a serious concern. This, in turn, will lead to the breakdown of ozone. Project report on ozone depletion environmental pollution. Why the hole in the atmospheric ozone layer above us. 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. However, various factors have led to the depletion and damage of this protective layer. Protecting the ozone layer while also preventing climate. The thinning or reduction of ozone depletion is most prominent in the polar regions, especially over antarctica. The obligations are general and contain no specific limits on chemicals that deplete the ozone layer. Mar 07, 2008 decreasing or eliminating the use of these chemicals will help protect the ozone layer. The decrease in the thickness of the ozone layer of formation of hole in it is called ozone depletion.
Ozone and environment ozone o3 a gas composed of three atoms of oxygen bluish gas that is harmful to breathe nearly 90% of the earths ozone is in the stratosphere and is referred to as the ozone layer ozone absorbs a band of ultraviolet radiation called uvb ozone depleting substances ods. Unlike oxygen o2, ozone has a strong scent and is blue in color. Ozone layer depletion, its causes, effects and control. It contains high concentrations of ozone o3 relative to other parts of the atmosphere. Nearly 90% of earths ozone is in the stratosphere and referred to as the ozone layer. The ozone layer has been found to be depleted by certain natural processes such as sunspots and stratospheric winds. Ozone layer depletion cause, effects, and solutions biology. During the vienna convention negotiations, countries discussed a possible protocol that would provide specific targets for certain chemicals, but no consensus was reached. This is the cause for the nearly 80% of the ozone depletion. Parttime hrai certification ozone depletion prevention certificate ib802.
But through domestic and international action, the ozone layer is healing and should fully recover by about 2065. What we all need to understand is the idea that we all are going to have to face the repercussions of ozone layer depletion. 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. Canadas ozone layer protection awareness training program is based on environment canadas code of practice for elimination of fluorocarbon emissions in refrigeration and air conditioning systems. Stratospheric ozone depletion, ultraviolet radiation and health. When this breakdown of the ozone layer occurs, the earth stands more vulnerable as it. Effects of ozone depletion for humans and the environment. National aeronautics and space administration nasa goddard space flight center international action has been effective in protecting the ozone layer. We care about ozone depletion because a thinner ozone layer allows more uv radiation to reach the. This layer absorbs the radiations and prohibits them from entering the outer surface of the earth. Ozone depletion is largely a result of manmade substances. Ozone depletion is primarily caused by human activities. Does depletion of the ozone layer increase groundlevel ultraviolet radiation. After a decade of relentless enlargement and deepening, it seems that ozone layer depletion might eventually be curbed, and precfc levels of the ozone layer reached by the midtwentyfirst century.
A free powerpoint ppt presentation displayed as a flash slide show on id. 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. Ozone layer depletion causes, effects and solutions 7. To halt the depletion of the ozone layer, countries around the world agreed to stop using ozone depleting substances. 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 main reasons of this depletion are the release of organohalogen compounds like chlorofluorocarbons and bromofluorocarbons. 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. Prevention of ozone layer depletion is one of the most essential things to attend to at this point of time and prevention of ozone depletion is also something that will. Lets have a look at some of the solutions to ozone layer depletion.
Cfcs get banned in 1974 scientists sherry rowland and mario molina discovered the link between the depletion of the ozone layer and cfcs. Fire extinguishers contain halons and methyl bromide in the form of pesticides can also be also a cause for the depletion. Find out what caused the ozone hole, and how the 1989 montreal protocol sought to put an end to ozone depletion. Ozone layer depletion cause, effects, and solutions. Let us have a detailed look at the various causes and effects of ozone layer depletion. The air quality planning units primary goal is to protect your right to breathe clean air. Frequently asked questions about the ozone layer us epa. 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.
Jan 10, 2011 the ozone layer is a concentration of ozone molecules in the stratosphere. Ppt ozone layer depletion powerpoint presentation free. Students explore the causes and effects of the earths ozone holes through discussion and an interactive simulation. The stratosphere, the next higher layer, extends about 1050 kilometers above the earths surface. May 30, 2017 49 curious ozone layer depletion statistics may 30, 2017 may 25, 2017 by brandon gaille since the invention of cfcs over 60 years ago, these chemicals have been found to be used in numerous products around the world. Case study on ozone layer ozone depletion chlorofluorocarbon. Thinning of the stratospheric ozone layer has been caused largely by longlived chlorine and bromine compounds, such. Cfcs, hcfcs, halons, methyl bromide, carbon tetrachloride, and methyl chloroform. Thus, ozone layer depletion has become a major concern among the environmentalists.
It protects us from harmful uv rays that can have serious effects on animals, biodiversity and peoples health, including skin cancer and eye cataract. Other materials included in the kit are a handbook for. What is alarming is the fact that there is a remarkable decrease over the polar regions of the earth. Unlike pollution, which has many types and causes, ozone depletion has been pinned down to one major human activity. Humans have introduced gases and chemicals into the atmosphere that have rapidly depleted the ozone layer in the last century. Depletion of stratospheric ozone o3, as commonly known as the hole in the ozone layer, is an issue of international concern. The thinning is most pronounced in the polar regions, especially over antarctica.
Another most feared aspect of pollution is depletion of ozone layer of the stratosphere. This depletion makes humans more vulnerable to the uvb rays which are known to cause skin cancer as well as other genetic deformities. Stratospheric ozone protection awards since 1990, epa has recognized outstanding achievement in ozone layer protection. Scribd is the worlds largest social reading and publishing site. Solution on ozone layer depletion september 16 was voted the world ozone day in the year 1994 by the united nations general assembly.
Ozone layer depletion and its prevention from theory to. Ozone depletion is allowing the uv radiation to earth surface. This ozone layer sustains life on the earth by absorbing a great deal of uv ultra violet light radiating out of sun. Once they get there they destroy ozone molecules and cause the ozone layer to become depleted or thinner. It is revealed that introduction of chloroflourocarbons cfcs in the environment is the most rated cause. This proves ozone depletion is a big issue that needs attention. Experts blame ozonelayer depletion on manmade chem. Effects of ozone layer depletion and its remedial measures essay. The layer of the earths atmosphere that surrounds us is called the troposphere. What are the causes and effects of ozone depletion. Ozone depletion blue colours in the south hemisphere in 2006. The depletion of the ozone layer has thus resulted in the birth of a fear in everybodys minds. Addressing ozone layer depletion ozone layer protection. Man has tried hard to deploy protective measures towards controlling the ozone layer from depletion,but this is so.
Let us see some of the important causes and effects of ozone layer depletion. Ozone layer depletion is one of the major environmental issues which is getting thinner day by day as a. Participants who get 75% or higher on the exam will receive certification and get an ozone depletion prevention odp card ontario only or an ozone depleting substances ods card all other provinces. In fact whole world is vulnerable to its after affects. Ozone layer importance, depletion, effects and protection. The main effect of ozone depletion is an increase in uvb rays reaching the earths surface causes. The climate system involves the atmosphere specifically processes within the troposphere, such as air circulation patterns land surfaces and oceans. The ozone layer is mainly found in the lower portion of the stratosphere. The vienna convention for the protection of the ozone layer is a multilateral environmental agreement signed in 1985 that provided frameworks for international reductions in the production of chlorofluorocarbons due to their contribution to the destruction of the ozone layer, resulting in an increased threat of skin cancer. The increase in the levels of uv rays lead to high rate of skin cancer and eye related problems. The ozone layer refers to a region of earths stratosphere that absorbs most of the suns uv radiation. Effects and measures to protect ozone layer depletion.
The first report of depletion in o 3 layer came out in the 1980s by an atmospheric scientist in antarctica. At the end of 20, 258 projects have been committed for an. The ozone layer is responsible for absorbing harmful ultraviolet rays, and preventing them from entering the earths atmosphere. The ozone layer protects the surface of the earth and its phenomena from stray rays from the sun. It is also the root cause of people developing health hazards like skin cancer and.
The stratosphere is home to the ozone layer that protects life on earth from. However, the fact that there also exists another layer strong enough to stop the former one is comforting. These chemicals are found in cleaning agents, aerosols, insulating foam, and refrigerants. Concerns over depletion of the ozone layer arose in the 1970s, when scientists realized that chemicals released by various anthropogenic activities could lead to a slow decline in ozone amounts in the stratosphere. Deplete the ozone layer 1987, in its london 1990, vienna 1995 and montreal 1997.
It allows only the required doses of the suns solar energy to reach the earths surface. Causes of ozone layer depletion and its effects on human. Ozone layer depletion causes increased uv radiation levels at the earths surface, which is damaging to human health. The severe depletion of the ozone layer in any particular area is called ozone hole. Vienna convention for the protection of the ozone layer. One of the biggest phenomenons that marked the late 70s was the observation of the depletion of the ozone layer. At the same time, however, the regime for the protection. We will also need to limit the use of products that have a large amount of chemical composition. The ozone layer lies approximately 1540 kilometers 1025 miles above the earths surface, in the stratosphere. Case study on ozone layer free download as powerpoint presentation. Ozone layer is also naturally broken down but there is a balance between its formation and natural depletion. Hence, we should be aware and actions must be taken to ensure that ozone layer is not destroyed. Global warming is caused by the greenhouse effect, which is essential to life as we know it on planet earth.
Evidence of ozone depletion in the stratosphere began to appear in the 1980s. Unfortunately, cfcs can eventually find their way into the earths atmosphere and the ozone layer. Low temperatures, increase in the level of chlorine and bromine gases in the upper stratosphere are some of the reasons that leads to ozone layer depletion. The importance of this depletion arose from ozone s role as an absorber of biologically damaging ultraviolet sunlight. 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. Apr 18, 2019 the ozone layer helps to protect life from harmful ultraviolet radiation. Generally, we find thinning or depletion of the ozone layer to the extent of ozone hole creation over the southern pole i. Ozone absorbs a band of ultraviolet radiation called uvb. Chlorofluorocarbon cfc banks from uses such as air conditioners or foams can be emitted after global production stops.
The ozone layer absorbs much of the incoming solar ultraviolet radiation uvr and thus offers substan tial protection from this radiation to all organisms living. The natural distribution of ozone around the earth is. Global warming and ozone layer depletion are two different problems see the sidebar misconceptions about global atmospheric change on page 95. Canadas ozone layer protection awareness program odpods. The ozone layer was discovered in 19 by the french physicists charles fabry and henri buisson. However, many of the other chemicals still cause ozone layer depletion, just not as much, or cause other environmental damage when used. 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. For the most part, this has already been done, and substitute chemicals have been found for use. Ozone layer is a thin blanketlike layer that spreads over the atmosphere of the earth. Ozone layer protection environmental protection department. Within the stratosphere, the ozone layer is the portion that contains the highest. Ozone layer depletion daily current affair article for. Timeline of stratospheric ozone depletion and observations.
The causes, mechanism and bioeffects of ozone layer depletion on humans were addressed. The term ozone depletion is used to describe two distinct, but related, observations. About 90% of the planets ozone is in the ozone layer. Protecting the ozone layer department of the environment. Negative effects include increases in certain types of skin cancers, eye cataracts and immune deficiency disorders. Project ozone layer depletion pdf the stratospheric ozone layer forms a thin shield in the upper atmosphere, protecting life on earth from. The ozone layer resides in the stratospheric layer of the earths atmosphere. To the point where a seasonal hole in the ozone layer began to appear above the antarctic. Hence, cfcs are transporting agents that are responsible for damaging the ozone layer. Specific controls on the production of ozone depleting chemicals were first agreed through that conventions montreal protocol in. Experts blame ozonelayer depletion on manmade chem icals containing chlorine and bromine that are emitted from a number of products. The ozone layer helps to protect life from harmful ultraviolet radiation. But many researchers do not agree with these predictions,14 and express their. Protocol and ozone layer depletion will find this publication to be an.
Ozone depletion and climate change environment canada. Ozone layer depletion, is simply the wearing out reduction of the amount of ozone in the stratosphere. Causes and effects of ozone layer depletion that are. Causes, effects and solutions of ozone layer depletion. Pdf causes of ozone layer depletion and its effects on. A very easy way to control ozone depletion would be to limit or reduce the amount of driving as vehicular emissions eventually result in smog which is a culprit in the deterioration of the ozone layer.
Ozone layer depletion, its causes and its effects free download as powerpoint presentation. But it does not cause more than 12% of the ozone layer depletion. The danger and prevention of ozone layer depletion. Guided by the clean air act, we work collaboratively with states, communities, and businesses to develop and implement strategies to reduce air pollution from a variety of sources that contribute to the groundlevel ozone or smog problem. Most ozone is found in the stratosphere upper part of the atmosphere, more than 10 to 16 kms from the surface of the earth. Depletion of this layer by ozone depleting substances ods will lead to higher uvb levels, which in turn will cause increased skin cancers and cataracts and potential damage to some marine organisms, plants, and plastics. Ozone depletion and climate change have usually been thought of as environmental issues with little in common other than their global scope. Ozone depletion facts and information national geographic. 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. As a result the total amount of ozone remains constant. The main things that lead to destruction of the ozone gas in the ozone layer. Cfcs nonflammable nontoxic trap heat good insulators.
The danger and prevention of ozone layer depletion humans cause ozone depletion with air conditioners and refrigerators, of all things. 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. The latter phenomenon is referred to as the ozone hole. It is revealed that introduction of chloroflourocarbons cfcs in the environment is the most rated cause of said depiction. The ozone depleting effect of refrigerants is important, because the ozone layer filters out ultraviolet uv radiation, which might otherwise reach the surface of the earth.
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