The ozone layer contains less than 10 parts per million of ozone, while the average ozone concentration in earths. As a result the total amount of ozone remains constant. It is revealed that introduction of chloroflourocarbons cfcs in the environment is the most rated cause of said depiction. Apr 18, 2019 the ozone layer helps to protect life from harmful ultraviolet radiation. International day for the preservation of the ozone layer, 16.
Twenty questions and answers about the ozone layer lead author. The richness of the ozone layer that makes the hole so significant and the science behind the hole is far less popular. Pdf on jan 1, 2001, md safiuddin and others published global ozone. Global warming and ozone layer depletion are two different problems see the sidebar misconceptions about global atmospheric change on page 95. Protecting the ozone layer and reducing global warming undp. Ozone protection and accelerated phaseout of hcfcs in china. Scribd is the worlds largest social reading and publishing site. The depletion of the ozone layer has thus resulted in the birth of a fear in everybodys minds. Report on activities in kyrgyzstan devoted to 16september. Because stratospheric ozone depletion is a global issue, people in other countries also.
Chemicals called chlorofluorocarbons cfcs are a reason we have a thinning ozone layer. Unlike pollution, which has many types and causes, ozone depletion has been pinned down to one major human activity. Nearly 90% of earths ozone is in the stratosphere and referred to as the ozone layer. 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. In order to create awareness among people regarding the need of ozone layer for our survival, campaigns are being run all over the world.
This date has been designed as such by the united nations general assembly in order to commemorate the signing of the montreal protocol on substances that deplete the ozone layer. For nearly a billion years, ozonemolecules in the atmosphere haveprotected life on earth from theeffects of. And, most important, we know that if ozone depleting gases were to continue to accumulate in the atmosphere, the result would be more depletion of the ozone layer. Many are encouraged to come forward to share their efforts they have been putting to cut down the emission of harmful gases that cause environmental issues. It is very essential as it prevents nearly 99% o f the uv. World ozone day 2019 international day for the preservation. The causes, mechanism and bioeffects of ozone layer depletion on humans were addressed. The thinning is most pronounced in the polar regions, especially over antarctica. Although ozone o3 is present in small concentrations throughout the atmosphere, most ozone about 90% exists in the stratosphere, in a layer between 10 and 50 km above the surface. Ppt ozone layer depletion powerpoint presentation free.
Ozone is bad in the troposphere because it is harmful to breathe and is the primary component. Layers of the atmospherethe atmosphere is divided into five layers. The thinning of the ozone layer has increased the risk that australians already face from overexposure to uv radiation from an outdoor lifestyle. Septembers was also designated by the united nations as international day for the preservation of the ozone layer. The earths ozone layer plays an important role in protecting human health and the environment. This is apparently found in the lowest region of the stratosphere. It is thickestnear the surface and thins out with height until iteventually merges with space. Impacts of ozone depletion the ozone layer acts as our planets sunscreen, providing a filter to help protect all life forms from the suns damaging ultraviolet uv rays. Ian grimmond ozone layer depletion when you walk outside, there is a pale blue molecule up in the stratosphere that is protecting you every second of every day of your life, this molecule is called ozone. Ozone absorbs a band of ultraviolet radiation called uvb. Depletion of ozone layer is also causing the problem of food shortage to humans. The ozone layer, our earths sunscreen, absorbs about 98 percent of this devastating uv light. Ozone depletion, uv protection issue, arrows and earth, atmosphere vector. 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.
The ozone layer is a layer in earths atmosphere which. The natural distribution of ozone around the earth is. 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. 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. Report on activities in kyrgyzstan devoted to 16september international day for the preservation of ozone layer 1. 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. Find out what caused the ozone hole, and how the 1989 montreal protocol sought to put an end to ozone depletion. It contains high concentration of ozone o 3 in relation to other parts of the atmosphere, although still small in relation to other gases in the stratosphere. The ozone layer is a belt of the naturallyoccuring gas ozone that sits. Most ozone is found in the stratosphere upper part of the atmosphere, more than 10 to 16 kms from the surface of the earth. The depletion of the ozone layer is a global problem that can only be prevented if all countries work together. This layer absorbs the radiations and prohibits them from entering the outer surface of the earth. A summer dress o zone layer depletion ozone layer depletion causes affecting factors ozone hole etc. Effects of ozone depletion for humans and the environment.
The layers which occupy the lower part of the atmosphere removes the unwanted pollutants from. One of the main reasons for the widespread concern about. Designation of amount of such depletion as an ozone hole is made when the detected amount of depletion exceeds fifty percent. This event commemorates the date of the signing of the montreal protocol on substances that deplete the ozone layer in 1987. Case study on ozone layer ozone depletion chlorofluorocarbon. Experts blame ozonelayer depletion on manmade chem icals containing chlorine and bromine that are emitted from a number of products. As humans are heavily dependent on crops for food so there is a great chance if depletion of ozone layer is not checked it may cause seriously. A dynamic equilibrium is maintained between the formation and decomposition of ozone. The montreal protocol is an international treaty designed to protect the ozone layer by phasing out the production of numerous substances that are responsible for ozone depletion. The ozone layer or ozone shield is a region of earths stratosphere that absorbs most of the suns ultraviolet radiation. Ozone layer depletion causes increased uv radiation levels at the earths surface, which is damaging to human health. Case study on ozone layer free download as powerpoint presentation. Far above earths surface, the ozone layer helps to protect life from harmful ultraviolet radiation. The main reasons of this depletion are the release of organohalogen compounds like chlorofluorocarbons and bromofluorocarbons.
Twenty questions and answers about the ozone layer. Ozone layer depletion and its effects 1575 words 7 pages. The obligations are general and contain no specific limits on chemicals that deplete the ozone layer. 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. Protecting the ozone layer department of the environment. The montreal protocol on substances that deplete the ozone layer. Today is international day for the preservation of the ozone layer. Ozone depletion is allowing the uv radiation to earth surface. It has been found that this protective ozone layer is getting depleted because of the presence of cfc chlorofluorocarbon compounds.
Dear students, the team of jagran josh is presenting you a set of 10 questions based on ozone layer depletion. During the vienna convention negotiations, countries discussed a possible protocol that would provide specific targets for certain chemicals, but no consensus was reached. Since 1994, international day for the preservation of the ozone layer world ozone day is celebrated to raise awareness and understanding about the consequences of ozone layer depletion. 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. Causes of ozone layer depletion and its effects on human. Chart and diagram slides for powerpoint beautifully designed chart and diagram s for powerpoint with visually stunning graphics and animation effects. The ozone layer, a fragile shield of gas, protects the earth from the harmful portion of the rays of the sun, thus helping preserve life on the planet. It was agreed on 16th september 1987, and entered into force on 1st january 1989. But many researchers do not agree with these predictions,14 and express their.
Saving the ozone layer saved human lives september 16, 2012 4. Ozone is unstable and decomposes to molecular oxygen. Ozone layer the ozone layer is basically naturally occurring gas in the region of stratosphere where ozone particles are accumulated 2. The thinning of the ozone layer has increased the risk that australians already face from overexposure to. Affordable and search from millions of royalty free images, photos and vectors. Ppt ozone layer depletion powerpoint presentation free to. 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. When this breakdown of the ozone layer occurs, the earth stands more vulnerable as it. What are these ozone depleting substances ods used for.
Since 1995, september 16 of each year is celebrated as the international day for the preservation of the ozone layer. European environment agency for the status of the currently ongoing ozone hole, you can visit the copernicus web site. The ozone layer is a natural layer of gas in the upper atmosphere which protects humans and other living things from the harmful ultraviolet uv rays of the sun. The exact amount of ozone varies, depending on the seasons and the location.
Unlike oxygen o2, ozone has a strong scent and is blue in color. The ozone layer helps to protect life from harmful ultraviolet radiation. In response to the prospect of increasing ozone deple. Presentation on ozone depletion linkedin slideshare. Feb 12, 2018 far above earths surface, the ozone layer helps to protect life from harmful ultraviolet radiation. The ozone layer resides in the stratospheric layer of the earths atmosphere. Since the ozone layer absorbs uvb ultraviolet light from the sun, ozone layer depletion increases surface uvb levels all else equal, which could lead to damage, including increase in skin cancer. Ozone layer protection environmental protection department. The ozone layer is a layer of ozone high up in the earths atmosphere stratosphere, between approximately 10 kilometres and 50 kilometres above earths surface. This layer absorbs between 93 and 99 per cent of the ultraviolet radiation from the sun. 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. Global warming is caused by the greenhouse effect, which is essential to life as we know it on planet earth. Pdf causes of ozone layer depletion and its effects on.
The latest scientific assessment of ozone depletion completed in 2018, shows that, as a result, parts of the ozone layer have recovered at a rate of % per decade since 2000. But through domestic and international action, the ozone layer is healing and should fully recover by about 2065. Ozone protection and accelerated phaseout of hcfcs in china ministry of environmental protection. 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. The vienna convention for the protection of the ozone layer. Protecting the ozone layer has enormous benefits for the united states. Why the hole in the atmospheric ozone layer above us. The ozone layer and its depletion linkedin slideshare. Ozone layer protection european commission europa eu. Ozone depleting substances, such as cfcs and hcfcs hydrochlorofluorocarbons, tend not decompose chemically. Ozone layer is depleting and we must ban the use of substances that are depleting ozone layer. Climate change essay pdf sample writing sample of essay on a given topic climate change.
Ozone layer simple english wikipedia, the free encyclopedia. When cfc is released into the atmosphere, they mix with atmospheric. Almost always the ozone has only been correlated with the hole in the ozone layer and the damages it has caused to the environment. Depletion of stratospheric ozone o3, as commonly known as the hole in the ozone layer, is an issue of international concern. According to research, greenhouse gases can accelerate the warming of. The chlorofluorocarbon and the halons are potent ozone depletors. With this understanding, we know that ozone depletion is occur ring and why. Overall, ozone depletion increases with latitude with low levels of depletion at the equator and tropics, and highest depletion at the poles. The emission of ozone depleting substances has been damaging the ozone layer. Ozone is made of oxygen and has a chemical equation of oo2. Although ozone depletion has been a global issue, there is significant differences in distribution of ozone layer depletion across the world.
The ozone layer is a layer of ozone high up in the earth s atmosphere stratosphere, between approximately 10 kilometres and 50 kilometres above earths surface. The layer shields the entire earthfrom much of the harmful ultravioletradiation that comes from the sun. Learn what cfcs are, how they have contributed to the ozone hole, and how the 1989 montreal. This website addresses stratospheric ozone issues, including the science of ozone depletion, epas regulatory approach to protecting the ozone layer, epa. Our new crystalgraphics chart and diagram slides for powerpoint is a collection of over impressively designed datadriven chart and editable diagram s guaranteed to impress any audience. Ozone is good in the stratosphere because it absorbs all of the most energetic ultraviolet radiation uvc, most of the uvb radiation and some of the least energetic uv radiation uva. Ozone layer is also naturally broken down but there is a balance between its formation and natural depletion. Layers of the atmosphere 45the suns utraviolet rays 68the ozone layer 9 3 4. In order to make these campaign more effective, we have gathered a list of 32 ozone layer slogans. The phaseout of controlled uses of ozone depleting substances and the related reductions have not only helped protect. Schonbein in the year 1840 confirmed its existence and jacqueslouis soret rooted the. On 16th september 2011 republican public association rac ecoholod carried out an ecological action hcfc phase out. Timeline of stratospheric ozone depletion and observations.
International day for the preservation of the ozone layer. This date has been designed as such by the united nations general assembly in order to commemorate the signing of the montreal protocol on substances that. As a result, there has been a general thinning of the ozone layer over most of the globe, including between five to nine per cent depletion over australia since the 1960s. Ozone depletion consists of two related events observed since the late 1970s. The stratospheric ozone layer is important for the protection of the earth. Part seven in our series exploring on the montreal protocol on substances that deplete the ozone layer dubbed the worlds most successful environmental agreement.
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