Human activities like pollution and emissions already send lots of halogen gases into the stratosphere but, scientists have noted that halogens from volcanoes contain twice and thrice as many halogens that human activities even produce. Near the ground, ozone forming as a result of chemical reactions involving traffic pollution and sunlight may cause a number of respiratory problems, particularly for young children. Estimates of ozone depletion and skin cancer incidence to examine the vienna convention achievements. Thus, ozone layer depletion has become a major concern among the environmentalists. Title vi for stratospheric ozone protection, signed into law. Evs global warming, ozone depletion ppt ozone depletion. Ppt ozone depletion powerpoint presentation free to. Far above earths surface, the ozone layer helps to protect life from harmful ultraviolet radiation. As a result of its chemical composition, ozone is regarded as a special type of oxygen as it contains three oxygen molecules o3 as opposed to the usual two oxygen molecules o2. Effects of ozone depletion ozone depletion is affecting the human health and environment negatively, as it allows the penetration of uv radiations to reach the earth.
No robust link between stratospheric ozone depletion and longterm. Ozone is ozone is a form of oxygen with 3 oxygen atoms o3. 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. The ozone layer is a deep blanket in the stratosphere made up of comparatively high concentration of the ozone. Ozone scatters shortwavelength blue incoming radiation from the sun. A free powerpoint ppt presentation displayed as a flash slide show on id.
Ozone is a gas that is present in the ozone layer in the stratosphere of the earth. The thinning is most pronounced in the polar regions, especially over antarctica. Approximately 90 percent of the atmospheres ozone occurs from 1018 km 611 miles to about 50 km about 30 miles above earths surface. Fire extinguishers contain halons and methyl bromide in the form of pesticides can also be also a cause for the depletion. The hole in the ozone layer was first noted in the 1980s, and is of concern as increased.
Ppt ozone layer depletion powerpoint presentation free to. But through domestic and international action, the ozone layer is healing and should fully recover by about 2065. Pdf download files stratospheric ozone depletion, ultraviolet radiation and health pdf 107kb pdf files for other chapters and for the complete summary. Ozone gas is perceptibly blue in colour and has a characteristic pungent smell. It was then that the vienna convention for the protection of the ozone layer was created in response. Ozone depletion facts and information national geographic. This powerpoint presentation will guide the students through a description of the earths ozone layer and the concept behind ozone depletion. Ozone absorbs a band of ultraviolet radiation called uvb. The total direct radiative forcing due to cfcs, hcfcs, halons, ccl4 and ch3ccl3. The ozone layer refers to a region of earths stratosphere that absorbs most of the suns uv radiation. This means the potential of depleting the ozone layer is higher with volcanic smoke. This is the cause for the nearly 80% of the ozone depletion.
Ozone layer, region of the upper atmosphere, between roughly 15 and 35 km 9 and 22 miles above earths surface, containing relatively high concentrations of ozone molecules. Cfcs, hcfcs, halons, methyl bromide, carbon tetrachloride, and methyl chloroform. 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. Ozone depletion consists of two related events observed since the late 1970s. Pdf atmospheric ozone layer depletion and its impact. When did we realize ozone depletion was an issue, and how did we fix it. 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. Depletion of ozone layer powerpoint ppt presentation slides. Total bromine from halons has decreased from a peak of 8. It contains high concentrations of ozone o3 relative to other parts of the atmosphere. Apr 29, 2014 ozone layer plays an important role in absorbing biologically harmful ultraviolet radiation emitted by the sun. Rayleigh scattering of incoming, short wavelength radiation. Ozone is highly corrosive and toxic and is used as a disinfectant.
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. Ozone depletion simple english wikipedia, the free encyclopedia. Nearly 90% of earths ozone is in the stratosphere and referred to as the ozone layer. 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. Learn what cfcs are, how they have contributed to the ozone hole, and how the 1989 montreal protocol sought to put an end to ozone depletion. View and free download depletion of ozone layer powerpoint ppt presentation slides. 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. The uploader spent hisher valuable time to create this depletion of ozone layer powerpoint presentation slides, to share hisher useful content with the world. If interested, you can purchase this powerpoint from my online store. By 1985, the globe had already seen advancements in the scientific understanding of ozone depletion and its impacts on human health and the environment. Jul 02, 2015 this quick video discusses the role of the ozone layer and how cfcs can cause ozone depletion.
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. Since about the 1970s, there has been a decrease in total volume of the ozone in the ozone. Causes, effects and solutions of ozone layer depletion. Project report on ozone depletion environmental pollution. Understanding ozone depletion 5 ozone layer last class we talked about the importance of the ozone layer for life in our planet. It can be found in small concentrations in the troposphere where it is considered a pollutant. In 1974, chemists mario molina and frank sherwood rowland discovered a link between chlorofluorocarbons cfcs and the breakdown of ozone in the.
Stratospheric ozone depletion, ultraviolet radiation and health. Cfc 11, or r11 has the maximum potential amongst chlorocarbons because of the. A number of consequences can result from increased levels of uvultraviolet radiation striking the earth, including. The ozone layer helps to protect life from harmful ultraviolet radiation. The emission of ozone depleting substances has been damaging the ozone layer. Our ozone layer depletion ppt template is excellent for giving an indepth presentation about such a topic. Dec, 2015 on this page you can read or download mcq on environmental pollution depletion ppt in pdf format.
The ozone layer was discovered in 19 by the french physicists charles fabry and henri buisson. Chlorodifluoromethane r22, for example, has an odp of 0. The majority of the atmospheres ozone resides in the stratosphere, with the biggest. The net effect of these link ages is an intensification of both climate change and ozone depletion and possibly a delay in the recovery of the ozone layer. You can find maps of the ozone layer and compare different regions of the globe for ozone coverage. Is there a difference in ozone coverage between different hemispheres. Causes of ozone layer depletion and its effects on human. The ozone layer refers to a region of earths stratosphere that absorbs most of the. The ozone layer is important for blocking most of the harmful radiation that comes from the sun. Chapagain and others published atmospheric ozone layer depletion and its impact, find, read and cite all. The term ozone depletion can refer to a number of distinct, but related phenomena. This quick video discusses the role of the ozone layer and how cfcs can cause ozone depletion.
Ppt ozone depletion powerpoint presentation free to download id. The ozone layer is mainly found in the lower portion of the stratosphere. Ozone depletion free download as powerpoint presentation. The ozone depletion potential odp of a chemical compound is the relative amount of degradation to the ozone layer it can cause, with trichlorofluoromethane r11 or cfc11 being fixed at an odp of 1. Ozone layer plays an important role in absorbing biologically harmful ultraviolet radiation emitted by the sun. These radiations can cause severe diseases in humans such as skin cancer, eye damage and genetic mutations etc 9. Ppt ozone layer depletion authorstream presentation. What is the impact of volcanic ash on the ozone layer. Ozone depletion and climate change environment canada. If you dont see any interesting for you, use our search form on bottom v. The adobe flash plugin is needed to view this content.
Find out what caused the ozone hole, and how the 1989 montreal protocol sought to put an end to ozone depletion. Apr 18, 2019 the ozone layer helps to protect life from harmful ultraviolet radiation. The ozone hole grows and decreases every year with. 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. The emission of ozonedepleting gases are threatening the earths ozone layer. This website addresses stratospheric ozone issues, including the science of ozone depletion, epas regulatory approach to protecting the ozone layer, epa. Pdf causes of ozone layer depletion and its effects on. Stratospheric ozone depletion is a concern because the ozone layer in the stratosphere keeps 9599% of the suns ultraviolet radiation from striking the earth. Ozone depletion eric lin, cody lu natalie qin, silvia shi the ozone layer is essential to organisms because it protects them from harmful effects of the. The ozone layer is found in the upper stratosphere and its primary function is to filter ultraviolet shortwave radiation that comes from the sun. There, it will absorb almost all ultraviolet light which is harmful to many organisms. Give your memorable depletion of ozone layer presentation and build your crawd. The latter phenomenon is referred to as the ozone hole.
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