Why the hole in the atmospheric ozone layer above us. Unlike oxygen o2, ozone has a strong scent and is blue in color. Ozone is a colourless gas which is found in the stratosphere of our upper atmosphere. These gases bring chlorine and bromine to the stratosphere, which cause depletion of the ozone layer. The troposphere is the layer where most weather activity. A seminar on the depletion of the ozone layer, presented by ozoagu peter cj.
Pdf ozone depletiona warning of global warming researchgate. Ozone depletion consists of two related events observed since the late 1970s. Like an infection that grows more and more virulent, the continentsize hole in earths ozone layer keeps getting bigger and bigger. Also explore the seminar topics paper on ozone water treatment with abstract or synopsis, documentation on advantages and disadvantages, base paper presentation slides for ieee final year mechanical engineering me or production automobile students for the year 2019 2020. Ozone depletion also explains much of the observed reduction in stratospheric and upper tropospheric temperatures. This quick video discusses the role of the ozone layer and how cfcs can cause ozone depletion. Causes of ozone layer depletion and its effects on human. Ppt ozone layer depletion powerpoint presentation free to. Ppt ozone layer depletion powerpoint presentation free. The purpose of this seminar is to help article 5 countries smoothly phase out ods such as cfcs. 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.
Let us have a detailed look at the various causes and effects of ozone layer depletion. Following is the list of some of the main ozone depleting substances and the sources from where they are released. Unlike pollution, which has many types and causes, ozone depletion has been pinned down to one major human activity. The third body m absorbs the excess energy liberated by the above reaction and there by stabilise the o 3 ozone molecule.
It covers the entire planet and protects life on earth by absorbing harmful ultravioletb uvb radiation from the sun. Industries that manufacture things like insulating foams, solvents, soaps, cooling things like air conditioners. 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. We collected most searched pages list related with seminar for ozone layer depletion and more about it. Ozone depletion and climate change environment canada. 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. Apr 18, 2019 the ozone layer helps to protect life from harmful ultraviolet radiation. The chlorine and bromine compounds that cause significant depletion of the ozone layer are cfcs, carbon tetrachloride ccl4, methyl chloroform ch3ccl3. The ozone layer helps to protect life from harmful ultraviolet radiation. There, it will absorb almost all ultraviolet light which is harmful to many organisms. Nearly 90% of earths ozone is in the stratosphere and referred to as the ozone layer.
Ozone gas is perceptibly blue in colour and has a characteristic pungent smell. The thinning is most pronounced in the polar regions, especially over antarctica. Ozone depletion simple english wikipedia, the free encyclopedia. Bangladesh perspective published in national dailies observance of international ozone day, 1998. National seminar on plant science and human welfare. Nearly 500 organizations, teams, and individuals from 40 countries have received stratospheric ozone protection awards for their exceptional leadership, personal dedication, and technical achievements. Progress report 2003 united nations environment programme, environmental e. Awareness and knowledge on the ozone depletion and its outreach. If interested, you can purchase this powerpoint from my online store. 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.
The stratosphere is home to the ozone layer that protects life on earth from intense ultraviolet radiation. Stratospheric ozone protection awards since 1990, epa has recognized outstanding achievement in ozone layer protection. Depletion of the ozone layer increase in harmful ultraviolet light depletion of ozone layer chlorine reacts with o3 in the ozone depletion of the ozone layer impact on human body and ecosystems ozone layer depletion incoming harmful ultraviolet light depletion chain reaction q. Ozone layer depletion ozone layer depletion the effect on the world the effect of ozone layer depletion often seems as if it is a far away problem, given that the actual holes in this protective blanket over the earths atmosphere are concentrated around the poles and far from most human settlements. The buildup of oxygen in the atmosphere led to the formation of the ozone layer in the upper atmosphere or stratosphere. When there was no ozone layer, life could only exist in the sea. Due to this, it is also taking a toll on our health and the environment. We assigned pre and post seminar questionnaires covering the awareness and knowledge of. The so 2f 2 global background mixing ratio increased during recent decades and had reached about 1. These radiations can cause severe diseases in humans such as skin cancer, eye damage and genetic mutations etc 9. A free powerpoint ppt presentation displayed as a flash slide show on id.
Ozone layer depletion penn state college of earth and. Ozone depletion facts and information national geographic. Normal ozone ozone layer depletion and its effects. It is also one of the prime reasons which are leading to global warming. Explore ozone water treatment with free download of seminar report and ppt in pdf and doc format. The natural distribution of ozone around the earth is. Ozone layer depletion cause, effects, and solutions byjus. Find out what caused the ozone hole, and how the 1989 montreal protocol sought to put an end to ozone depletion. Introduction under the montreal protocol on substances that deplete the ozone layer, article 7 of the protocol requires all parties, both developing countries also called article 5 countries and developed countries. 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. More than 60 highschool students attended these seminars. The ozone hole and its causes 12observations on ozone layer 14depletionobservation 1 15observation 2 17misconceptions about the ozone layer 18depletionbibliography 19 11 12. Project report on ozone depletion environmental pollution. The layer of ozone gas is what which protects us from the harmful ultraviolet radiations of the sun.
Certain industrial processes and consumer products result in the emission of halogen source gases to the atmosphere. Rivm report 481505011 technical report on stratospheric ozone. Global warming stopped in 1998 because it is controlled by ozone depletion, not greenhouse gases. Companies are finding substitutes for cfcs, and people in general are becoming more awareness of the dangers of ozone layer depletion. What emissions from human activities lead to ozone depletion. 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. Ozone layer depletion is the thinning of ozone layer that protects the earth from the harmful uv radiations. Protecting the ozone layer and reducing global warming undp. Jica training seminar on ozone layer protection measures.
Each year since the late 1970s, much of the protective layer of stratospheric ozone above antarctica has disappeared during september, creating what is popularly known as the ozone hole. Ozone is formed by photochemical reaction, followed by three body reaction. 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. Jul 02, 2015 this quick video discusses the role of the ozone layer and how cfcs can cause ozone depletion. Ozone absorbs a band of ultraviolet radiation called uvb. The latter phenomenon is referred to as the ozone hole.
At last, the montreal protocol has resulted in stopping additional ozone loss and investigated by 300 experts ver 4 years survey on ozone depletion earth day was first observed on 22 april 1970. Ozone layer depletion causes, effects and solutions 7. Ozone depleting substances are the substances such as chlorofluorocarbons, halons, carbon tetrachloride, hydrofluorocarbons, etc. Therefore many governments are taking measures to prevent ozone depletion. Ppt a seminar on the depletion of the ozone layer, presented by. Ppt ozone layer depletion authorstream presentation. A close look at the evolution at the life on earth reveals that initially the.
The ozone depletion phenomenon the national academies press. Explore the causes, effects, and solutions to ozone. Ozone layer depletion cause, effects, and solutions. The maps were produced with data collected by statellite istruments, including the ozone monitoring instrument on the aura satellite. Ozone layer depletion is one of the most serious problems faced by our planet earth. Pdf there are many situations where human activities have significant effects on the environment. Find out what caused the ozone hole, and how the 1989 montreal. Are you looking for seminar for ozone layer depletion. Ozone depletion, gradual thinning of earths ozone layer caused by the release of chemical compounds containing gaseous chlorine or. The term ozone depletion can refer to a number of distinct, but related phenomena. Since about the 1970s, there has been a decrease in total volume of the ozone in the ozone. Most ozone is found in the stratosphere upper part of the atmosphere, more than 10 to 16 kms from the surface of the earth. 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 layer depletion is simply the wearing out reduction of the amount of ozone in the stratosphere.
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