The ozone layer and its depletion linkedin slideshare. Free chlorine in the upper atmosphere catalyzes the. Ozone layer is a thin blanketlike layer that spreads over the atmosphere of the earth. This is a resource file for both teachers and students interested in the ozone layer. Jan 10, 2011 the ozone layer is a concentration of ozone molecules in the stratosphere. Ozone, a form of oxygen consisting of three atoms of oxygen instead of two, is considered an air pollutant when found at ground levels and is a major component of smog. An increase or decrease of the gate voltage with respect to the source causes the depletion region to expand or shrink. However, various factors have led to the depletion and damage of this protective layer. This note discusses the latest evidence on ozone depletion and uvr levels in the uk, their health implications and related issues. Compare now the scr and hp options in terms of the level of nox emissions that they can achieve. The latter phenomenon is commonly referred to as the.
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. Twenty questions and answers about the ozone layer. During the vienna convention negotiations, countries discussed a possible protocol that would provide specific targets for certain chemicals, but no consensus was reached. Learn more about the process, causes, and effects of ozone layer depletion. The term ozone depletion is used to describe two distinct, but related, observations. About 90% of the planets ozone is in the ozone layer. Another most feared aspect of pollution is depletion of ozone layer of the stratosphere. 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.
In comparison to the base case and scr, hp has the least environmental impact for fossil fuel depletion, global warming, ozone depletion, acidification, photochemical smog, and human toxicity. Ozone layer depletion compounds that contain chlorine and bromine molecules, such as methyl chloroform, halons, and chlorofluorocarbons cfcs, are stable and have atmospheric lifetimes long enough to be transported by winds into the stratosphere. Ozone layer depletion, its causes and its effects free download as powerpoint presentation. Ozone depletion consists of two related events observed since the late 1970s. The montreal protocol controls led to a substantial reduction in the emissions of ods over the last two decades. It is thickestnear the surface and thins out with height until iteventually merges with space. Ozone layers future linked strongly to changes in climate. Pdf causes of ozone layer depletion and its effects on.
The layer of the earths atmosphere that surrounds us is called the troposphere. These days its easy to check on the local uv index, which tells you how intense the uv radiation is in your area. Ozone layer depletion pdf file the origin, causes, mechanisms and bio effects of ozone layer depletion as. What are the mechanisms of ozone depletion environmental. The uv intensity on the surface of the earth fluctuates from day to day and depends on where you live. 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 held in 1987 amendments to the.
Scribd is the worlds largest social reading and publishing site. Ozone absorbs a band of ultraviolet radiation called uvb. Export a ris file for endnote, procite, reference manager, zotero, mendeley export a text file for bibtex note. The scientific assessment panel of the montreal protocol on substances that deplete the ozone layer 2 concludes that atmospheric abundance of most controlled ods is decreasing. However, many of the other chemicals still cause ozone layer depletion, just not as much, or cause other environmental damage when used. The stratosphere, the next higher layer, extends about 10. Since exposure to sunlight causes damage to human tissue, less ozone layer leads to a higher incidence of skin and eye conditions, including skin cancer and eye lesions such as cataracts. The ozone layer protects the surface of the earth and its phenomena from stray rays from the sun. 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.
Title vi for stratospheric ozone protection, signed into law. Ozone layer protection environmental protection department. Sep 22, 2009 ozone layer depletion leveling off, satellite data show date. Nearly 90% of earths ozone is in the stratosphere and referred to as the ozone layer. Vivert1448 priyanka n jeevan 1446 1453 rekha 1445 shabnam 1447. Oct 09, 2017 ozone layer is a thin blanketlike layer that spreads over the atmosphere of the earth. However, these measures will take time to work, and concern remains over how far levels of ultraviolet radiation uvr will rise at ground level with their potential to cause skin cancer. Mar 07, 2008 decreasing or eliminating the use of these chemicals will help protect the ozone layer. The montreal protocol on substances that deplete the ozone layer. 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.
Both at earths ground level and the upper region of the atmosphere a notorious gas known as ozone can be easily identified. This note discusses the latest evidence on ozone depletion and uvr. Ozone is also used commercially as a bleaching agent and to purify municipal water supplies. Between10to 50 km above the sea level and is called as ozone layer.
Presentation on ozone depletion linkedin slideshare. Now a days certain parts of o 3 layer is becoming thinner and o 3 holes. The danger and prevention of ozone layer depletion. Protecting the ozone layer department of the environment. Based on its location along the atmospheric area, ozone may be considered to be either beneficial or dreadful for. It is thickest near the surface and thins out with height until it eventually merges with space. The main cause of ozone depletion and the ozone hole is manufactured. Ozone layer depletion formerly nm urban homesteader. Global warming is caused by the greenhouse effect, which is essential to life as we know it on planet earth. Essay on ozone depletion and the environment 1505 words. Layers of the atmospherethe atmosphere is divided into five layers. Effects of ozone layer depletion and its remedial measures.
Ozone layer depletion gef assembly global environment facility. This timeline highlights the average area of the ozone hole between september 7th and october th as observed by nasa spacedbased instruments see colored bars and scale. 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. Newly detected ozonedepleting substances in the atmosphere pdf. The vienna convention for the protection of the ozone layer. For the most part, this has already been done, and substitute chemicals have been found for use. Experts blame ozonelayer depletion on manmade chem icals containing chlorine and. Layers of the atmosphere 45the suns utraviolet rays 68the ozone layer 9 3 4. The only elements left in the depletion region are ionized donor. It functions as a barrier between the harmful ultraviolet rays of the sun and the human and prevent those harmful ultraviolet rays. The latest ozone layer depletion news is included at the foot of the page.
Case study depletion of ozone in the atmosphere the work of g. Concentrations of ozonedepleting chemicals continue to rise in the atmosphere. Chlorofluorocarbons cfcs are the major cause of ozone depletion. It is formed by the reaction of various air pollutants in the presence of sunlight. O 3 protects us from damaging uv radiation of the sun. The depletion of the ozone layer has multiple effects on your health, primarily negative. The ozone layer is a concentration of ozone molecules in the stratosphere. The stratospheric ozone layer forms a thin shield in the upper atmosphere, protecting life on earth from. Ozone layer protection european commission europa eu. The stratosphere, the next higher layer, extends about 1050 kilometers above the earths surface. 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.
The ozone layer and its depletion 1 the atmosphere is divided into five layers. Protecting the ozone layer and reducing global warming undp. 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 held in 1987. Ozone layer the ozone layer is basically naturally occurring gas in the region of stratosphere where ozone particles are accumulated 2. Ozone layer depletion and its ill effects in australia. Decreasing or eliminating the use of these chemicals will help protect the ozone layer. No design or tech skills are necessary its free, easy, and awesome. 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. The montreal protocol on ozone layer protection is frequently cited by politicians as the most successful international effort to protect the environment gore, 2006. Of course, there are numerous other consequences of climate change. By merging more than a decade of atmospheric data from european satellites. Ozone depletion and the environment there is overwhelming scientific evidence that manmade chemicals are destroying the ozone layer nobel prizes have already been awarded for the research.
Eliminating clabsi, a national patient safety imperative. Ozone layer depletion running head ozone layer depletion. Awareness programme on depleting ozone layer ahmedabad. It allows only the required doses of the suns solar energy to reach the earths surface. New powerpoint files are available here on the twenty questions and answers about ozone.
Ozone layer depletion leveling off, satellite data show. Ozone layer depletion describes following occurrings. The ozone layer the thin atmospheric band highup in the stratosphere that protects living things on earth from the suns harmful ultraviolet rays, not to be confused with damaging ozone. Ozone layer depletion is harmful not just to the environment, but to all living things from animals to humans. 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. The ozone layer is a belt of the naturallyoccuring gas ozone that sits at an altitude of between 15 and 30 kilometers above the earth. This ozone layer sustains life on the earth by absorbing a great deal of uv ultra violet light radiating out of sun. Eliminating clabsi, a national patient safety imperative final report on the national on the cusp. Causes and effects of ozone layer depletion that are. About depletion of the ozone layer is the anticipated increase in the amounts of. Ozone layer depletion and its prevention from theory to. Which one of the following statements about ozone depletion is false. O a much larger, but seasonal, decrease in stratospheric ozone over earths polar regions during the same period commonly referred to as the ozone hole. O a slow, steady decline of about 4 percent per decade in the total amount of ozone in earths stratosphere since around 1980.
Depletion of the ozone layer results in increased uv radiation reaching the earths surface, which in turn leads to a greater chance of overexposure to uv radiation and the related health effects of skin cancer, cataracts, and immune suppression. Ozone layer depletion, its causes and its effects scribd. How to prevent ozone depletion and what would happen if. There are several indications that the global ozone layer is beginning to recover from odsinduced depletion.
Causes of ozone layer depletion and its effects on human. Man has tried hard to deploy protective measures towards controlling the ozone layer from depletion,but this is so. Global warming and ozone layer depletion are two different problems see the sidebar misconceptions about global atmospheric change on page 95. The importance of ozone layer is that it serves as an envelope of blanket surrounding the atmosphere of the earth. Ozone layer depletion and its control measures zilwach. Effects and measures to protect ozone layer depletion. But ozone it self, when comes too close to earth can have delirious effect on both living and non living as it is a powerful oxidant. Jan 30, 2012 the ozone layer and its depletion 1 2. The ozone layer is responsible for absorbing harmful ultraviolet rays, and preventing them from entering the earths atmosphere. Rush limbaugh argues that humans are safe, because volcanic chlorine has been working on the ozone layer longer than manmade chlorine, and yet were. A weeklong programme to spread awareness about the ozone layer in the earths atmosphere has been organized at gujarat science city mainly for school. This fact sheet explains the importance of protecting the stratospheric ozone layer. Ozone layer depletion leveling off, satellite data show date. B dobson and other scientists in measuring concentrations of chloride and ozone in the atmosphere g.
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