The chlorofluorocarbon and the halons are potent ozone. Ozone depletion, uv protection issue, arrows and earth, atmosphere vector. Powerpoint is the worlds most popular presentation software which can let you create professional depletion of ozone layer powerpoint presentation easily and in no time. All of the assessment documents core assessment report, executive summary, and twenty questions and answers about the ozone layer. The causes of ozone depletion the impacts ozone depletion has on the environment the current status of the. Calculation of depletion layer thickness by including the mobile carriers saeed mohammadi and c. A limitation of these analyses is that they assume ozone depletion to be purely chemically driven, and that no interaction with climate change is included in the.
Affordable and search from millions of royalty free images, photos and vectors. The increase of ultraviolet light due to depletion of the ozone layer will not only. 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 stratosphere gets its name because it is stratified, or layered. There are natural processes that create and destroy ozone in the stratosphere. The ozone layer lies approximately 1540 kilometers 1025 miles above the earths surface, in the stratosphere. In fact whole world is vulnerable to its after affects. 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 majority of the atmospheres ozone resides in the stratosphere, with the biggest. Ozone in the ozone layer is formed by the action of solar ultraviolet light on oxygen. A close look at the evolution at the life on earth reveals that initially the. The resulted outcome indicates that the amount of rainfall with the concentration of o3 have a strong influence on the occurrence of ozone layer depletion. Find out what caused the ozone hole, and how the 1989 montreal protocol sought to put an end to ozone depletion. 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. Newly detected ozonedepleting substances in the atmosphere pdf. There is little or no reliable evidence on levels of uv radiation prior to concerns related to ozone depletion pre1980s due to main tenance and calibration.
Downloads scientific assessment of ozone depletion 2018. The ozone layerthe ozone layer is a deep layer in thestratosphere, encircling the earth,that has large amounts of ozone in it. Download fulltext pdf download fulltext pdf causes of ozone layer depletion and its effects on human. 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. Research has shown that the ozone is slowly being depleted. Causes, effects and solutions of ozone layer depletion. For nearly a billion years, ozonemolecules in the atmosphere haveprotected life on earth from theeffects of. Ozone layer depletion definition, causes, solutions toppr. 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. Ozone absorbs a band of ultraviolet radiation called uvb. Ozone depletion consists of two related events observed since the late 1970s. Stratospheric ozone depletion, ultraviolet radiation and health.
Find out what caused the ozone hole, and how the 1989 montreal. It is present in traces less than 1 ppm in the atmosphere. Depletion to ozone layer depletion does not affect a region or a country. Frequently asked questions about the ozone layer us epa. Presentation on ozone depletion linkedin slideshare. Update on ozonedepleting substances odss and other gases of. Project report on ozone depletion environmental pollution. Cfcs, hcfcs, halons, methyl bromide, carbon tetrachloride, and methyl. Class i substances are considered to have the most significant impact on ozone layer depletion. Scribd is the worlds largest social reading and publishing site. Ozone layer plays an important role in absorbing biologically harmful ultraviolet radiation emitted by the sun. The latest ozone layer depletion news is included at the foot of the page. This helps you give your presentation on depletion of ozone layer in a conference, a school lecture, a business proposal, in a webinar and business and professional representations. Global warming is caused by the greenhouse effect, which is essential to life as we know it on 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. The ozone layer was discovered in 19 by the french physicists. Electromagnetic energy coming from the sun is absorbed by the earth, which. Ozone layer the ozone layer is basically naturally occurring gas in the region of stratosphere where ozone particles are accumulated 2. In this entry we present the data on ozone layer depletion, signs of recovery, emissions of ozonedepleting substances, international agreement and. 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 ozonedepleting substances ods.
This radiation is dangerous to living organisms on earth. The ozone layer is a belt of the naturallyoccuring gas ozone that sits at an altitude. The ozone layer refers to a region of earths stratosphere that absorbs most of the suns uv radiation. 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. Ozone layer depletion, its causes and its effects free download as powerpoint presentation. Fire extinguishers contain halons and methyl bromide in the form of pesticides can also be also a cause for the depletion. The ozone layer helps to protect life from harmful ultraviolet radiation. Following is the list of some of the main ozone depleting substances and the sources from where they are released.
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. One chlorine molecule has a capacity to breakdown thousands of molecules present in the ozone layer, therefore, it results in the depletion of the ozone layer. 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. Experts blame ozonelayer depletion on manmade chem icals open source pdf creator containing. Ozone depletion facts and information national geographic.
Project ozone layer depletion pdf the stratospheric ozone layer forms a thin shield in the upper atmosphere, protecting life on earth from. Ozone layer depletion, its causes and its effects scribd. Policy responses to ozone depletion mario molina and sherwood rowland showed in 1974 that cfc gases destroy ozone coordinating committee on ozone layer ccol established by unep in the 1970s vienna convention for the protection of the ozone layer held in 1985 montreal protocol to ban substances that deplete. The ozone layer and its depletion linkedin slideshare. The third body m absorbs the excess energy liberated by the above reaction and there by stabilise the o 3 ozone molecule. The ozone layer is one layer of the stratosphere, the second layer of the earths atmosphere. 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. This layer absorbs between 93 and 99 per cent of the ultraviolet radiation from the sun. The ozone layer is mainly found in the lower portion of the stratosphere.
Ozone layer simple english wikipedia, the free encyclopedia. The thinning is most pronounced in the polar regions, especially over antarctica. The exact amount of ozone varies, depending on the seasons and the location. The montreal protocol on substances that deplete the. Destruction of the upper atmospheric layer of ozone gas, caused by substances formed from breakdown of ozone depleting substances. List of books and articles about ozone layer online. Global warming and ozone layer depletion are two different problems see the sidebar misconceptions about global atmospheric change on page 95. But many researchers do not agree with these predictions,14 and express their. Thus, ozone layer depletion has become a major concern among the environmentalists. The ozone layer is a belt of naturally occurring ozone gas that sits 9. 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.
This layer absorbs the radiations and prohibits them from entering the outer surface of the earth. Calculation of depletion layer thickness by including the. It sets binding obligations for countries to phase out production of. What we all need to understand is the idea that we all are going to. 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. They are capable of breaking down the molecules of the ozone layer.
The proposed methodology is addressed for the first time using data mining and image processing. The sun propagates ultraviolet radiations which as an adverse effect on living beings. Ozone depleting substances are the substances such as chlorofluorocarbons, halons, carbon tetrachloride, hydrofluorocarbons, etc. Download twenty questions and answers about the ozone layer pdf 2. Pdf causes of ozone layer depletion and its effects on. The layer shields the entire earthfrom much of the harmful ultravioletradiation that comes from the sun. The stratosphere increases in warmth with elevation because ozone gases in the upper layers. Depletion of stratospheric ozone o3, as commonly known as the hole in the ozone layer, is an issue of international concern.
The ozone layer depletion is a major concern and is associated with a number of factors. Detection of ozone layer depletion using image processing. Lets have a look at some of the solutions to ozone layer depletion. Conversion project approved by the 41st executive committee in december. 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 natural distribution of ozone around the earth is. Ozone layer depletion cause, effects, and solutions. The increase in the levels of uv rays lead to high rate of skin cancer and eye related problems. The stratosphere is the mass of protective gases clinging to our planet. 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 main causes responsible for the depletion of the ozone layer are listed below. Cfcs nonflammable nontoxic trap heat good insulators.
Addressing ozone layer depletion ozone layer protection. It contains high concentrations of ozone o3 relative to other parts of the atmosphere. This is the cause for the nearly 80% of the ozone depletion. Ozone is formed by photochemical reaction, followed by three body reaction. Nearly 90% of earths ozone is in the stratosphere and referred to as the ozone layer.
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